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  • Inorganic Chemistry  (5,042)
  • Coleoptera
  • Column liquid chromatography
  • Industrial Chemistry
  • Seismology
  • ddc:330
  • 1985-1989  (4,720)
  • 1950-1954  (2,980)
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  • 1
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    Description of a fourth species in the genus Aphelinis Antoine (Coleoptera: Cetoniidae) (1989)
    In:  Zoologische Mededelingen vol. 63 no. 8, pp. 73-77
    Details
    Publication Date: 2024-01-12
    Description: A fourth species is described in the genus Aphelinis Antoine: Aphelinis krikkeni, from Central African Republic. Phylogenetic relations within the genus Aphelinis are considered.
    Keywords: Coleoptera ; Cetoniidae ; Aphelinis ; Central Africa ; new species
    Repository Name: National Museum of Natural History, Netherlands
    Type: info:eu-repo/semantics/article
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  • 2
    Electronic Resource
    Electronic Resource
    Host plant recognition in monophagous weevils: specificity in feeding responses of Ceutorhynchus constrictus and the variable effect of sinigrin (1989)
    Springer
    Entomologia experimentalis et applicata 53 (1989), S. 157-166 
    Details
    ISSN: 1570-7458
    Keywords: Ceutorhynchus constrictus ; Coleoptera ; Curculionidae ; Ceutorhynchinae ; Alliaria petiolata ; garlic mustard ; Brassicaceae ; Cruciferae ; glucosinolates ; sinigrin ; host plant selection ; monophagous ; feeding stimulants
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung Ceutorhynchus constrictus Marsh. (Coleoptera: Chrysomelidae: Ceutorhynchinae) ist ein monophager Rüsselkäfer, der an Knoblauchhederich frisst. Das Wirtswahl-Verhalten dieses Käfers ist im Labor untersucht worden. Die meisten Crucifiren waren im Wahlversuche nicht akzeptiert, wenn Knoblauchhederich als Vergleichspflanze vorhanden war. Von Brassica nigra, Sinapis alba, und Thlaspi arvense wurden im Vergleich gleiche Mengen verzehrt wie von der Wirtspflanze. Blühende Descurainia sophia Pflanzen wurden, im Gegensatz zu Jungpflanzen der gleichen Art, angenommen. Die wichtichsten Phagostimulanten in Extrakten von Knoblauchhederich-Blättern waren ungeladene, wasserlösliche Substanzen. Das häufigste Glukosinolat im Knoblauchhederich, Sinigrin, war auch ein Phagostimulant. Doch war die phagostimulierende Wirkung von Sinigrin nur in Kombinationen mit noch nicht identifizierten, ungeladenen Substanzen aus Knoblauchhederich-Blätter nachweisbar. Wirtspfanzen-Beziehungen von monophagen Insekten werden diskutiert im Zusammenhang mit der Eigenart des Glukosinolat-Inhaltes ihrer Wirtspflanzen.
    Notes: Abstract Host plant relations of the monophagous weevil Ceutorhynchus constrictus Marsh. (Coleoptera: Curculionidae: Ceutorhynchinae) feeding on garlic mustard, Alliaria petiolata (Bieb.) Cavara & Grande (Cruciferae) were studied in the laboratory. Most other crucifers were rejected in choice tests using garlic mustard as a reference plant, but Brassica nigra, Sinapis alba and Thlaspi arvense were as acceptable as the host plant. Flowering plants of Descurainia sophia were acceptable while young plants of this species were not. The most important feeding stimulants in extracts of garlic mustard were uncharged, water soluble compounds. The most abundant glucosinolate in garlic mustard, sinigrin, was a feeding stimulant, too. However, the feeding stimulatory activity of sinigrin was only expressed in the presence of still unidentified uncharged compounds from garlic mustard leaves. Host plant relations in monophagous crucifer-feeding insects is discussed in relation to the distinctness of glucosinolate patterns found in their host plants.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00187997
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  • 3
    Electronic Resource
    Electronic Resource
    Egg guarding and its significance in the heterocerid beetle,Dampfius collaris (Kies.) (1989)
    Springer
    Journal of insect behavior 2 (1989), S. 139-141 
    Details
    ISSN: 1572-8889
    Keywords: Coleoptera ; Heteroceridae ; egg guarding ; parental care ; predation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01053624
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  • 4
    Electronic Resource
    Electronic Resource
    Energetic costs of mating in a flightless female firefly,Photinus collustrans (Coleoptera: Lampyridae) (1989)
    Springer
    Journal of insect behavior 2 (1989), S. 841-847 
    Details
    ISSN: 1572-8889
    Keywords: cost of mating ; semelparous ; Photinus collustrans ; Coleoptera ; Lampyridae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01049405
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  • 5
    Electronic Resource
    Electronic Resource
    Determination of the enantiomeric composition of (R*,S*)-1-ethylpropyl 2-methyl-3-hydroxypentanoate, the male-produced aggregation pheromone of Sitophilus granarius (1989)
    Springer
    Entomologia experimentalis et applicata 51 (1989), S. 149-153 
    Details
    ISSN: 1570-7458
    Keywords: Aggregation pheromone ; sitophilate ; 1-ethylpropyl 2-methyl-3-hydroxypentanoate ; stereoisomers ; enantiomers ; Sitophilus granarius ; granary weevil ; Coleoptera ; Curculionidae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé S. granarius L. est un déprédateur important des grains stockés. Le (R*,S*)-1-éthylpropyl 2-méthyl-3-hydroxypentanoate a été identifié en 1987 comme le principal composé du sitophilate, la phéromone mâle d'agrégation de S. granarius. La composition énantiométrique du sitophilate a été déterminée par 3 méthodes: 1) tests biologiques des énantiomères synthétiques (2S,3R) et (2R,3S) du diastéréomère actif (R*,S*); 2) spectrométrie RMN 1H des esters Mosher dérivés de la phéromone naturelle et des sitophilates de synthèse (2S*,3R*)-et (2R*,3S*); 3) comparaison en capillarité GLC des temps de rétention des dérivés naturels de la phéromone et des 2 éniantiomères de synthèse. La combinaison des 3 méthodes confirme que le (2S,3R) énantiomère est la forme active du sitophilate. Le mâle produit 〉96% de l'énantiomère (2S,3R). Il n'y a pas eu attraction de S. granarius par le (2R,3S) sitophilate. S. oryzae L. et S. zeamais Motsch n'ont pas été attirés par le (2S,3R)-sitophilate. L'utilisation du (2S,3R)-1-éthylpropyl 2-méthyl-3-hydroxypentanoate dans les pièges devrait permettre une détection précoce de la présence de S. granarius dans des stocks de grains.
    Notes: Abstract The enantiomeric composition of sitophilate, the granary weevil [Sitophilus granarius (L.)] male-produced aggregation pheromone [(R*,S*)-1-ethylpropyl 2-methyl-3-hydroxypentanoate)], was determined by three methods: (1) bioassaying the synthetic (2S,3R) and (2R,3S) enantiomers of the active (R*,S*) diastereomer; (2) 1H NMR spectroscopy of Mosher ester derivatives of the natural pheromone and synthetic (2S,3R)-and (2R,3S)-sitophilate; and (3) capillary GLC comparisons of the retention times of derivatized natural pheromone and the two synthetic enantiomers. The combined methods confirmed the (2S,3R) enantiomer as the active form of sitophilate. Male granary weevils were shown to produce 〉96% (2S,3R)-sitophilate. No significant attraction of S. granarius by the (2R,3S) enantiomer was observed. Rice and maize weevils [S. oryzae (L.) and S. zeamais Motschulsky] were not attracted by (2S,3R)-sitophilate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00186732
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  • 6
    Electronic Resource
    Electronic Resource
    Glandular trichomes of Solanum berthaultii and resistance to the Colorado potato beetle (1989)
    Springer
    Entomologia experimentalis et applicata 51 (1989), S. 133-140 
    Details
    ISSN: 1570-7458
    Keywords: Coleoptera ; Chrysomelidae ; Leptinotarsa decemlineata ; Colorado potato beetle ; Solanaceae ; Solanum berthaultii ; potato ; plant resistance ; glandular trichomes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé Les mécanismes de défense de la pomme de terre sauvage, S. berthaultii Hawkes, aux larves de Leptinotarsa decemlineata Say, ont été étudiés par ablation sélective des trichomes glandulaires et par l'élimination de leur exsudat des folioles, et par comparaison avec S. tuberosum L. qui a perdu les trichomes glandulaires défensifs A et B. L'ablation des trichomes A a augmenté la proportion de larves ayant consommé S. berthaultii. L'élimination de l'exsudat des trichomes B a augmenté la proportion de consommatrices et réduit la mortalité. Les principaux composés actifs de l'exsudat B, c'est-à-dire des esters d'acides gras de sucrose, n'étaient actifs qu'en présence de trichomes A. Les esters de sucrose n'ont pas modifié la consommation larvaire sur folioles de S. tuberosum, ou sur disques de feuilles de S. berthaultii dont les trichomes A avaient été enlevés. La croissance des larves survivantes n'a pas été modifiée significativement par l'ablation des trichomes A ou l'élimination de l'exsudat de B. La croissance des larves a été significativement augmentée quand les folioles de S. berthaultii ont été incorporés dans l'aliment artificiel après élimination de la barrière physique due aux pédoncules B. La croissance a été de même importance sur aliments artificiels contenant des feuilles (fraiches ou en poudre lyophylisée) de S. berthaultii ou de S. tuberosum, mais plus faible que sur folioles de S. tuberosum. La présence de trichomes A est indispensable à la résistance de S. berthaultii aux L, de L. decemlineata. Les gouttelettes de type B contenant des esters de sucrose augmentent l'expression de la résistance en présence d'une défense active par trichomes A.
    Notes: Abstract The defensive mechanisms of the wild potato, solanum berthaultii Hawkes, to larvae of the Colorado potato beetle, Leptinotarsa decemlineata (Say), were studied by selective removal of glandular trichomes and trichome exudates from leaflets, and by comparing performance on S. berthaultii and on the cultivated potato, S. tuberosum L., which lacks defensively active type A and B glandular trichomes. Removal of type A trichomes increased the proportion of larvae that fed on S. berthaultii. Removal of the exudate from type B trichomes increased the proportion of larvae that fed and led to a decrease in mortality. The predominant active compounds in type B exudate, i.e. fatty acid esters of sucrose, were only effective in the presence of type A trichomes. Sucrose esters did not affect larval feeding on S. tuberosum leaflets or on S. berthaultii leaf discs from which the type A trichomes had been removed. Growth of surviving larvae was not significantly affected by removing type A trichomes or type B exudate. Growth of larvae was significantly increased when S. berthaultii leaflets were presented in artificial diet which eliminated the physical barrier of the type B stalks. Growth was no different on artificial diet containing either S. berthaultii or S. tuberosum leaf material (fresh or lyophilized powder) but was poorer on these diets than on S. tuberosum leaflets. The presence of type A trichomes is a fundamental requirement for expression of S. berthaultii resistance to L1 L. decemlineata. Type B droplets containing sucrose esters increase the expression of resistance in the presence of defensively-active type A trichomes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00186730
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  • 7
    Electronic Resource
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    Joint effects of temperature, food quality, and season on the development of the cerambycid Morimus funereus under laboratory conditions (1989)
    Springer
    Entomologia experimentalis et applicata 51 (1989), S. 261-267 
    Details
    ISSN: 1570-7458
    Keywords: Coleoptera ; Cerambycidae ; Morimus funereus ; development ; laboratory conditions ; food quality ; temperature ; season
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé L'étude a porté sur les effets d'une température constante (23 °C), de la qualité de l'aliment,-B = aliment naturel, c'est-à-dire de l'écorce de chêne pulvérisée; B+C = aliment naturel enrichi avec de la poudre de biscuits sucrés-, et de la saison sur le développement larvaire de M. funereus L. La température de 23 °C a été défavorable aux larves récoltées en septembre dans des souches de chênes et élevées sur aliment B: les larves étaient mortes en 30 jours. Avec aliment B+C, l'effet défavorable a été neutralisé et le poids des larves augmenté de 543%, 897% et 1179% en 1, 2 et 3 mois. Des larves néonates d'été ou d'hiver se sont bien développées sur B+C, mais toutes les larves d'hiver étaient mortes sur B en 40 j. Des larves de mêmes parents, écloses à différentes époques de l'année, ont présenté des différences saisonnières du taux de survie et de la vitesse de développement lors de leur élevage à 23 °C sur B+C. Le développement le plus rapide et la meilleure survie ont été obtenus avec des larves écloses au début ou au milieu de l'été; tandis que le développement le plus lent et la plus mauvaise survie ont été obtenus avec les larves écloses à la fin de l'été. Les changements saisonniers synchrones des adultes et de leurs descendants, exprimés à différents niveaux d'organisation biologique, suggèrent l'existence d'un rythme annuel endogène qui dépend de l'expression de différents gènes au cours du cycle annuel.
    Notes: Abstract The effects of constant temperature (23 °C), food quality (B, natural diet i.e. powdered oak bark; B+C, natural diet enriched with powdered sweet crackers) and season on larval development of the cerambycid Morimus funereus L. were studied. The temperature of 23 °C exerted an unfavourable effect on larvae collected from oak stumps in September and bred on B; i.e. the larvae died within 30 days. When the larvae consumed B+C the unfavourable effect of temperature was abolished and the larvae increased their weight by 543%, 897% and 1179% in 1, 2 and 3 months, respectively. Newly hatched summerand winter-larvae developed successfully on B+C, while all the winter-larvae died within 40 days on B. Larvae of an identical parentage hatched in different phases of the annual cycle and showed seasonal differences in the rate of development and survival when reared on B+C at 23 °C. The fastest development and the highest survival rate were observed in larvae which emerged in early- and midsummer, whereas the slowest development and the lowest survival rate were in those hatched in late summer. The synchronized seasonal changes of adults and their offspring, as expressed at different levels of biological organization, suggest the existence of an endogenous annual rhythm which is dependent upon the expression of different genes in the course of the annual cycle.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00347889
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  • 8
    Electronic Resource
    Electronic Resource
    Behavioral responses of Diabrotica adults to plant-derived semiochemicals encapsulated in a starch borate matrix (1989)
    Springer
    Entomologia experimentalis et applicata 53 (1989), S. 219-228 
    Details
    ISSN: 1570-7458
    Keywords: Diabrotica spp. ; corn rootworms ; Chrysomelidae ; Coleoptera ; plant-derived semiochemicals ; starch matrix ; encapsulation ; controlled release
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé Le programme expérimental de 1987 était destiné à déterminer: 1) si les substances dérivées de végétaux et attractives pour Diabrotica pouvaient être encapsulées dans de l'amidon additionné d'acide borique; 2) si différentes formules attireraient les différentes espèces de Diabrotica dans un champ de maïs. L'indol, l'estragol, le vératrol, le phénylacétaldéhyde et le trans-anéthol n'ont pas été retenus, tandis que le trans-cinnamaldéhyde, la \-ionone, le 1,2,4-triméthobenzène, l'eugénol et l'isœugénol ont été encapsulés avec succès dans des pièges attachés à des pieds de maïs (les détails techniques sont fournis). Les pièges ont été relevés tous les 4 jours du 11 juillet au 8 septembre. Les résultats montrent que les substances allélochimiques sont conservées dans la capsule pendant des durées variables et libérées à des concentrations attractives pour les Diabrotica adultes. Un mélange de trans-cinnamaldéhyde et de 1,2,4,-triméthoxybenzène a été la formule la plus efficace, à l'exception des périodes de formation des barbes et du pollen, où aucune formule n'a été attractive. Bien que la variation saisonnière des réactions de Diabrotica limite l'utilisation des substances allélochimiques d'origine végétale, la capsule d'amidon peut être employée pour libérer des substances allélochimiques et constitue un outil potentiel pour la mise au point d'une méthode plus rationnelle de lutte contre Diabrotica.
    Notes: Abstract The concept of encapsulating semiochemicals into a starch matrix is being studied for potential use in corn rootworm (CRW) management programs. During 1987, experiments were conducted to determine: 1) If volatile plant-derived Diabrotica spp. attractants could be encapsulated in a starch borate matrix (SBM), and 2) If various SBM-semiochemical formulations would attract Diabrotica species over time in field corn. Chemical analyses of fresh SBM formulations indicated that indole, estragole, veratrole, phenylacetaldehyde, and trans-anethole were not retained during formulation but trans-cinnamaldehyde, Beta-ionone, 1,2,4,-trimethoxybenzene, eugenol and isœugenol were successfully encapsulated. Encapsulated semiochemical formulations were made into 20 mesh granules, placed in Pherocon ® 1C traps that were tied to corn plants, and sampled for CRW adults every 4 days from 11 July to 8 September. Field data indicated that encapsulated semiochemicals were retained in the SBM for varying lengths of time and were released at rates attractive to CRW adults. A two-component mixture of trans-cinnamaldehyde and 1,2,4-trimethoxybenzene was the most effective formulation tested; however, no formulation was effective during corn silking and pollination. Although seasonal variation in CRW response could limit the usefulness of some plant-derived semiochemicals, the starch matrix concept may be useful as a delivery system for semiochemicals and may have potential as a tool that could be used in the development of new more biorational CRW management programs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00162853
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  • 9
    Electronic Resource
    Electronic Resource
    Flight activity of Diabrotica spp. at the borders of cornfields and its relation to ovarian stage in D. barberi (1989)
    Springer
    Entomologia experimentalis et applicata 50 (1989), S. 61-67 
    Details
    ISSN: 1570-7458
    Keywords: Coleoptera ; Chrysomelidae ; northern corn rootworm ; western corn rootworm ; dispersal ; malaise trap ; habitat selection
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé Les activités de vol de D. barberi (NCR) et D. virgifera virgifera (WCR) ont été contrôlées par l'utilisation de pièges ‘malais’ placés en lisière de deux petits champs de maïs. Les populations de ces coléoptères sont maximales quand le maïs fleurit, mais leurs captures sont restées faibles jusqu'à ce que les barbes du maïs aient été sèches. Les captures de NCR et, dans une plus faible mesure, celles de WCR ont alors augmenté et sont restées importantes pendant toute la saison. Les pièges ‘malais’ ont été conçus pour que les adultes pénétrant par les côtés opposés soient récoltés séparément. Les femelles de NCR capturées face au champ de maïs avaient tendance à contenir moins d'ovocytes mûrs que celles capturées du côté opposé. Ces observations appuient l'hypothèse que les femelles NCR émigrent des champs de maïs pour s'alimenter, quand les barbes et le pollen de maïs, aliments préférés, deviennent indisponibles, mais que les femelles NCR pleines d'ovocytes mûrs recherchent le maïs quand elles sont en quête de lieux de ponte.
    Notes: Abstract Flight activity of corn rootworm beetles, the northern (NCR), Diabrotica barberi (Coleoptera: Chrysomelidae), and western (WCR), D. virgifera virgifera, was monitored using malaise traps placed at the edges of two small cornfields. Populations of beetles in the fields peaked while corn was flowering, but capture in malaise traps remained low until silks had dried. Capture of NCR and (to a lesser extent) WCR then increased and remained high through the season. Malaise traps were constructed to permit separate collections of beetles that entered on each of two opposite sides. Female NCR that were captured in sides that faced toward corn tended to contain fewer mature eggs than those in sides facing away from corn. These findings support the hypothesis that female NCR emigrate from cornfields to feed when fresh silk and corn pollen (favored foods) become unavailable, but that egg-laden NCR actively seek corn when searching for oviposition sites.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00190130
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  • 10
    Electronic Resource
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    Attraction of adult sweet potato weevils,Cylas formicarius elegantulus (Summers), (Coleoptera: Curculionidae), to sweet potato leaf and root volatiles (1989)
    Springer
    Journal of chemical ecology 15 (1989), S. 1095-1106 
    Details
    ISSN: 1573-1561
    Keywords: Sweet potato weevil ; Cylas formicarius elegantulus ; Coleoptera ; Curculionidae ; Ipomoea batatas ; sweet potato volatiles ; sesquiterpenes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract A dual-choice olfactometer was developed to study the responses of sweet potato weevils,Cylas formicarius elegantulus (Summers), to volatiles from the sweet potato,Ipomoea batatas (L.) Lam. Both males and females were attracted by volatiles from sweet potato leaves and a methylene chloride leaf extract. Females, but not males, responded to volatiles from storage roots and a methylene chloride root extract. Leaves and storage roots from four sweet potato cultivars (Centennial, Jewel, Resisto, and Regal) were attractive to female weevils; however, the attractant response varied with cultivar. GC profiles from leaf and root extracts, and GC-MS analysis of leaf extract, for Jewel cultivar enabled the volatile peaks to be identified as sesquiterpenes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01015202
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  • 11
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    Field responses of certain forest Coleoptera to conifer monoterpenes and ethanol (1989)
    Springer
    Journal of chemical ecology 15 (1989), S. 1729-1745 
    Details
    ISSN: 1573-1561
    Keywords: Kairomones ; host attraction ; monoterpenes ; ethanol synergism ; turpentine ; trapping ; Cerambycidae ; Scolytidae ; Curculionidae ; Cleridae ; Buprestidae ; Dryocetes autographus ; Monochamus scutellatus ; Hylobius pales ; Coleoptera
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Field experiments using baited sticky stovepipe traps and Lindgren multiple funnel traps were done near Chalk River, Ontario, Canada, to determine the effects of conifer monoterpenes (α-pinene, β-pinene, myrcene, limonene, camphene and carene) and ethanol on the number of beetles captured. Several species of conifer-feeding beetles were attracted to the monoterpenes or to monoterpenes and ethanol, including species in the families Cerambycidae (Asemum striatum, Acmaeops proteus, Xylotrechus undulatus, Monochamus scutellatus), Curculionidae (Pissodes strobi, Hylobius pales), and Scolytidae (Dryocetes autographus, Ips grandicollis). Species of Buprestidae generally did not respond to the monoterpenes or to ethanol. Species of Cleridae (Thanasimus dubius, Enoclerus nigripes rufiventris, Enoclerus nigrifrons gerhardi) which are predators of conifer bark beetles were attracted to the monoterpenes. Synergism between monoterpenes and ethanol was evident forM. scutellatus, H. pales, andD. autographus. While α-pinene was the most potent attractant for most beetle species, monoterpenes other than α-pinene synergized attraction to ethanol forD. autographus. Attraction of beetles to commercial turpentine and ethanol did not differ significantly from attraction to a pure monoterpene blend and ethanol.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01012261
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  • 12
    Electronic Resource
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    Pygidial secretions ofPasimachus subsulcatus (Coleoptera: Carabidae) deter predation byEumeces inexpectatus (Squamata: Scincidae) (1989)
    Springer
    Journal of chemical ecology 15 (1989), S. 1033-1044 
    Details
    ISSN: 1573-1561
    Keywords: Defensive mechanism ; avoidance response ; Eumeces inexpectatus ; Pasimachus subsulcatus ; Coleoptera ; Carabidae ; lizard ecology ; lizard predation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The carabid beetlePasimachus subsulcatus is an abundant ground-dwelling insect in west central Florida that exudes a powerful mucous membrane irritant when disturbed. This secretion can be sprayed over 10 cm from the abdominal tip. The southeastern five-lined skink,Eumeces inexpectatus, is an abundant insectivorous lizard sympatric withPasimachus. We assessed the availability ofPasimachus toEumeces and found it to be within the foraging microenvironment of the lizard. Analysis ofEumeces gut contents and field feeding trials indicate thatPasimachus are not ingested by the lizard, yet arthropods of comparable size and exoskeletal thickness are ingested. The movement response ofEumeces to isolatedPasimachus secretion constituents, conducted in a modified Y-maze laboratory experiment, was used to assess the repellent capabilities of the secretion.Eumeces are consistently repelled byPasimachus secretion constituents, indicating that the beetle is protected chemically from the lizard.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01015197
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  • 13
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    Structure-activity studies on aggregation pheromone components ofPityogenes chalcographus (Coleoptera: Scolytidae) (1989)
    Springer
    Journal of chemical ecology 15 (1989), S. 685-695 
    Details
    ISSN: 1573-1561
    Keywords: Synergism ; aggregation pheromone ; Pityogenes chalcographus ; Coleoptera ; Scolytidae ; chalcogran ; methyl (2E,4Z)-2,4-decadienoate ; enantiomers ; isomers ; stereoisomers ; synthesis ; bioassay ; structure-activity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Syntheses of all four Stereoisomers (2S,5S; 2S,5R;2R,5R; and2R,5S) of chalcogran, a major component of the aggregation pheromone ofPityogenes chalcographus, and of all four isomers (2Z,4Z; 2Z,4E; 2E,4E; and 2E,4Z) of methyl 2,4-decadienoate (MD), the second major pheromone component, are briefly described. Attraction responses of walking beetles of both sexes were tested to mixtures of the synergistic pheromone components or analogs. These bioassays showed that theE,Z isomer of MD is the most active when tested with chalcogran. When tested with (E,Z)-MD, (2S,5R)-chalcogran was the most active stereoisomer, while 2R,5R and 2R,5S isomers had intermediate activities, and the 2S,5S isomer was inactive. There was no evidence that the relatively less active Stereoisomers of chalcogran inhibited or promoted attraction to (2S,5R)-chalcogran with (E,Z)-MD. Male beetles only produce the activeE,Z isomer of MD (inactive alone) and their hindguts contain the most active (2S,5R)- and least active (2S,5S)-chalcogran. A mixture of all MD isomers with racemic chalcogran was not significantly different in attractivity compared to (E,Z)-MD with racemic chalcogran, indicating no synergistic or inhibitory effects of the inactive isomers of MD.
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    Host plant iridoid-based chemical defense of an aphid,Acyrthosiphon nipponicus, against ladybird beetles (1989)
    Springer
    Journal of chemical ecology 15 (1989), S. 1837-1845 
    Details
    ISSN: 1573-1561
    Keywords: Defense ; deterrent ; sequestration ; iridoid glycoside ; paederoside ; Acyrthosiphon nipponicus ; Homoptera ; aphid ; Aphididae ; Harmonia axyridis ; Coleoptera ; Coccinellidae ; Paederia scandens
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract A Rubiaceae-feeding aphid,Acyrthosiphon nipponicus, is seldom attacked by the ladybird beetle,Harmonia axyridis. A potent deterrent against the beetle was isolated from the aphid and identified as paederoside, an iridoid glycoside originating in the aphid's host,Paederia scandens. The iridoid content was as high as 2% of the intact body weight, and a large portion was found in the cornicle secretion.
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    Saw-toothed grain beetleOryzaephilus surinamensis (L.) (Coleoptera: Silvanidae) (1989)
    Springer
    Journal of chemical ecology 15 (1989), S. 1015-1031 
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    ISSN: 1573-1561
    Keywords: Saw-toothed grain beetle ; Oryzaephilus surinamensis ; Coleoptera ; Silvanidae ; aggregation pheromone ; electroantennogram ; behavioral bioassay ; blend ratio
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The antennal and behavioral responses of the saw-toothed grain beetle,Oryzaephilus surinamensis, to the three components of its male-produced aggregation pheromone were investigated. EAG recordings showed no differences between the responses of the two sexes to the synthetic pheromone components. In contrast, laboratory behavioral assays demonstrated marked differences between the sexes. More females than males were consistently attracted to mixtures of the synthetic components, and this bias appeared to be caused by one component in the blend. Altering the blend ratio resulted in changes in the ratio of the sexes attracted. Thus, if, as suggested by preliminary work, males vary the blend produced, this should alter the relative response of the sexes to the aggregation pheromone.
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    URL: http://dx.doi.org/10.1007/BF01015196
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    Oviposition stimulants for the beetle,Monochamus alternatus hope, in inner bark of pine (1989)
    Springer
    Journal of chemical ecology 15 (1989), S. 507-516 
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    ISSN: 1573-1561
    Keywords: Monochamus alternatus Hope ; Coleoptera ; Cerambycidae ; pine inner bark ; methanol extracts ; water extracts ; oviposition stimulants ; lightwood
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Field and laboratory ovipositional responses ofMonochamus alternatus Hope, respectively, to methanol and water extracts from pine inner bark were examined in comparison with those to pine inner bark, especially using a laboratory-built apparatus for the latter bioassay. Irrespective of the existence of volatiles from paraquat-induced lightwood, pine inner bark and its methanol and water extracts stimulated ovipositional response only in the presence of free moisture.
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    Olfactory orientation responses by walking femaleIps paraconfusus bark beetles (1989)
    Springer
    Journal of chemical ecology 15 (1989), S. 1147-1159 
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    ISSN: 1573-1561
    Keywords: Ips paraconfusus ; bark beetles ; Coleoptera ; Scolytidae ; olfaction ; orientation ; anemotaxis ; pheromones
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Synthetic pheromone was released from a dispenser stretched across the width of a wind tunnel. Beetles in pheromone-free wind wandered in all directions and did not appear to orient to the wind. A dosage series showed that pheromone decreased the walking rate and deviations from the upwind direction, and it increased the turning rate. The tracks were composed of relatively straight or gently curving sections interspersed with more infrequent, larger course adjustments. Although pheromone clearly affected the average heading of beetles within a treatment, any given individual exposed to pheromone did not necessarily head directly upwind or maintain a fixed absolute angle with respect to the wind direction. The response appeared to be an inaccurate anemotaxis, rather than an anemomenotaxis.
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    RPLC retention of 1,ω-di(alkoxy)-polysulphides (1989)
    Springer
    Chromatographia 27 (1989), S. 27-30 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; 1,ω-Di(alkoxy)-polysulphides ; Retention contributions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The reaction of S2Cl2 with alcohols yields products, the reversed-phase liquid chromatograms of which are similar to those of dialkyl-polysulphides RSnR, i.e., they represent homologous series. Four of the products were identified via GC-MS as 1,ω-di(alkoxy)-polysulphides having the general structure ROSnOR. Retention contributions of alkyl groups R and sulphur atoms in the −Sn — chain are not much different from values observed with polysulphides. The effect of oxygen, however, is only about −100 index units per O atom, while in dialkyl ethers values of −500 units have been reported.
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    A practical description of retention in reversed phase chromatography using four parameters (1989)
    Springer
    Chromatographia 27 (1989), S. 5-14 
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    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Retention behaviour ; Column parameters
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Retention of small molecules on reversed phase or other hydrophobic stationary phases can be represented by k′ values of members of a homologous series at varying solvent compositions. The evaluation of simple linear relationships leads to the introduction of a set of four parameters that contain all the information about retention behaviour of this homologous series in the binary solvent system chosen. It is possible to extrapolate to a hypothetical non-hydrophobic molecule and a solvent, the polarity of which equals that of the stationary phase, to characterize the properties of the stationary phase — eluent system. In addition, a chromatographic method for determination of the phase ratio of the column is proposed.
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    Purification of human chorionic gonadotropin hormone by anion-exchange high-performance liquid chromatography (1989)
    Springer
    Chromatographia 27 (1989), S. 601-604 
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    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Anion exchange separation ; Preparative separations ; Human chorionic gonadotropin hormone
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A high-performance liquid chromatography (HPLC) method was developed for the purification of 50mg crude human chorionic gonadotropin (HCG) hormone sample in one chromatographic run on a 250×10 mm SERVA DEAE Poliol-Si-500 column. During the 60-minute linear gradient of 0.05 M sodium sulfate, 0.05 M sodium hydrogen sulfate and 0.05% (v/v) acetonitrile in buffer “B” complete separation was accomplished in 40 min. Identity and purity of the fractions were checked by SDS electrophoretic method. The eluted HCG fractions were dialyzed for 24 hours to remove the buffer salts and liophilized. The activity of the hormone did not decreased significantly during the purification procedure.
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    Notes onDiphucephala affinis (Coleoptera:Scarabaeidae) associated with flowers ofHibbertia andAcacia in Western Australia (1989)
    Springer
    Plant systematics and evolution 168 (1989), S. 1-5 
    Details
    ISSN: 1615-6110
    Keywords: Angiosperms ; Dilleniaceae ; Hibbertia hypericoides ; Mimosaceae ; Acacia ; Coleoptera ; Scarabaeidae ; Diphucephala ; Beetle/plant associations ; non-pollinator ofHibbertia ; potentialAcacia pollinator ; Flora of Australia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Notes are provided on the association of the beetleDiphucephala affinis (Scarabaeidae) with yellow flowers ofHibbertia hypericoides, H. huegelii (Dilleniaceae),Acacia pulchella, andA. stenoptera (Mimosaceae). Observations were undertaken during September 9–19, 1979 at S. Perth, Western Australia. They indicated thatD. affinis is not a pollinator ofHibbertia as suggested in the literature, but may play a small role in the pollination of someAcacia species.
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    Presence of long-chain dialkyl ethers in cuticular wax of the Australian chrysomelid beetleMonolepta australis (1989)
    Springer
    Journal of chemical ecology 15 (1989), S. 255-263 
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    ISSN: 1573-1561
    Keywords: Monolepta beetle ; red-shouldered leaf beetle ; Monolepta australis ; lipid extract ; unsaturated aliphatic ethers ; 7-octadecenyl alkyl ethers ; gas chromatography-mass spectrometry ; Coleoptera ; Chrysomelidae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Investigation of the lipid extract of the Australian chrysomelid beetle,Monolepta australis, has revealed a novel homologous series of long-chain, unsaturated-saturated dialkyl ethers in the cuticular wax. Gas chromatography-mass spectrometry, proton magnetic resonance, infrared spectroscopy, and chemical degradation have shown that ethers of formula CH3(CH2)9CH=CH(CH2)6O(CH2)12–16CH3 predominate.
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    Inter- and intrapopulation variation of the pheromone, ipsdienol produced by male pine engravers,Ips pini (Say) (Coleoptera: Scolytidae) (1989)
    Springer
    Journal of chemical ecology 15 (1989), S. 233-247 
    Details
    ISSN: 1573-1561
    Keywords: Ips pini ; Coleoptera ; Scolytidae ; aggregation pheromone ; ipsdienol ; geographic variation ; intrapopulation variation ; speciation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract We determined the chirality of ipsdienol in individual male pine engravers,Ips pini (Say), from New York, California, and two localities in British Columbia (BC). Both quantity and chirality of ipsdienol varied significantly between and within populations ofI. pini. Beetles from California and southeastern BC produced primarily (R)-(−)-ipsdienol with mean ratios of (S)-(+) : (R)-(−) of 9 : 91 and 11 : 89, respectively, while beetles from New York produced primarily (S)-(+)-ipsdienol with a mean (S)-(+) : (R)-(−) ratio of 57 : 43. A population from southwestern BC was unlike any other known western population, producing primarily (S)-(+)-ipsdienol with a mean (S)-(+) : (R)-(−) ratio of 66 : 34. In contrast to the unimodal chirality profiles for ipsdienol production in populations from California and southeastern BC, the profiles of the populations from southwestern BC and New York were bimodal, with a common mode at approximately 44 : 56 (S)-(+) : (R)-(−). Bimodality in the profiles of ipsdienol chirality in two populations ofI. pini and remarkably high levels of intrapopulation variation in pheromone chirality in all four populations suggest that evolutionary change in pheromone channels of communication could occur, possibly in response to artificial selection pressures such as mass trapping.
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    Attraction of scolytids and associated beetles by different absolute amounts and proportions of α-pinene and ethanol (1989)
    Springer
    Journal of chemical ecology 15 (1989), S. 807-817 
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    ISSN: 1573-1561
    Keywords: Coleoptera ; Scolytidae ; Tomicus piniperda ; Trypodendron lineatum ; Hylurgops palliatus ; Thanasimus formicarius ; host attraction ; host volatiles ; ethanol ; α-pinene ; synergism
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The attraction of bark and ambrosia beetles as well as associated beetles to α-pinene and ethanol was studied in field experiments with flight barrier traps. α-Pinene and ethanol were released individually and as combinations in approximately 1∶1 or 1∶10 ratios and at four different release rates. Ethanol attractedTomicus piniperda (L.),Hylurgops palliatus (Gyll.),Trypodendron lineatum (Oliv.),Hylastes cunicularius Er.,H. brunneus Er.,H. opacus Er., andAnisandrus dispar (F.) (Scolytidae);Glischrochilus quadripunctatus (L.) andEpuraea spp. (Nitidulidae);Thanasimus formicarius (L.) (Cleridae); andRhizophagus depressus (F.) (Rhizophagidae). α-Pinene attracted all these species with the exception ofT. lineatum, H. cunicularius, andA. dispar. Combinations of a-pinene and ethanol resulted in synergistically increased attraction of all species with the exception ofH. opacus andA. dispar. A. dispar, the only hardwood-associated species in the study, was repelled by α-pinene. Both the release rates and the ratio at which the two substances were released influenced the response of the beetles. The differences in response between the beetle species seem to reflect dissimilarities in the release of the two substances among the various types of breeding material to which the species are adapted.
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    Olfactory orientation responses by walking femaleIps paraconfusus bark beetles I. Chemotaxis assay (1989)
    Springer
    Journal of chemical ecology 15 (1989), S. 3-24 
    Details
    ISSN: 1573-1561
    Keywords: Ips paraconfusus ; Coleoptera ; Scolytidae ; bark beetles ; taxis ; chemotaxis ; orientation ; olfaction ; pheromones
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Gas-liquid chromatography of the air within the arena developed for this assay showed that a concentration gradient was established within 1–2 min of applying the pheromone (ipsenol, ipsdienol,cis-verbenol), and that this gradient was nearly constant for 20–95 min after application. The concentration fell rapidly and approximately exponentially between the source and the center of the arena. Turning rate and the number of beetles that reached the source increased, and heading with respect to the source decreased, in the presence of pheromone. Responses of beetles that did and did not reach the source were significantly different, but within each group there were no significant differences among dosages. Turning rate and heading varied little with distance from the source, while walking rate decreased as distance from the release point of the beetles increased. We hypothesize that dosage exerts its major effect on source location by altering the probability that a beetle will enter into orientation behavior and that beetles orienting to sources have similar behaviors even when orienting to a wide range of dosages.
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    Counterturns initiated by decrease in rate of increase of concentration (1989)
    Springer
    Journal of chemical ecology 15 (1989), S. 183-208 
    Details
    ISSN: 1573-1561
    Keywords: Ips paraconfusus ; Coleoptera ; Scolytidae ; bark beetles ; olfaction ; orientation ; counterturning ; chemotaxis ; taxis ; pheromones ; tropotaxis ; schemakinesis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The position of beetles were marked at 1-sec intervals after they were released in still air 16–18 cm from point sources of pheromone. Characteristics of the tracks were quantified and compared to those that might be produced by counterturning schemakinesis, tropotaxis, klinotaxis, zigzagging, look-and-leap, or steepest-ascent schemakinesis mechanisms. The beetles' movements were highly irregular, but they turned almost continually and never fixed on a heading near 0° (=straight towards the source). Turn angle sizes increased slightly with absolute size of heading but had the opposite sign, thus compensating slightly for heading. Their distribution was centered about 0° and was unimodal. Heading decreased gradually as the source was neared, but the decrease became steeper within 1–5 cm of the source. Histograms showed that the maximum headings between occurrences when the beetle was headed directly towards the source (0°) were centered around 0° and most of them were less than 90°. However, maximum headings between 90° and 180° were not uncommon. Turn radius decreased as the source was neared. The counterturning mechanism was the most consistent with these observations. An analysis of rate of change of concentration with respect to heading and distance to the source further demonstrated that the counterturning mechanism could explain the form of the decrease in heading as the source was neared, if the major cue used to initiate counterturns was a decrease in the rate of increase of concentration. The tropotaxis could not recreate the form of the decrease, under any form of stimulus processing.
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    Volatiles released from individual spruce bark beetle entrance holes Quantitative variations during the first week of attack (1989)
    Springer
    Journal of chemical ecology 15 (1989), S. 2465-2483 
    Details
    ISSN: 1573-1561
    Keywords: Ips typographus ; Coleoptera ; Scolytidae ; Picea abies ; aggregation pheromones ; host tree resistance ; tree-switching ; GC-MS ; monoterpenes ; 2-methyl-3-buten-2-ol ; cis-verbenol, verbenone
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Volatiles released from individual entrance holes of eight spruce bark beetles (Ips typographus) were collected during the first week of attack on a resistant host tree. In order to quantify the release of the highly volatile 2-methyl-3-buten-2-ol (MB) from attacking males, a new method was developed with deuterated quantification standard released at the time of collection. The amounts of collected volatiles, as analyzed by GC and GC-MS, showed a large variation between individual holes and also between subsequent entrainments from the same hole. Most of the quantified compounds on the average have two maxima, with a pronounced intervening depression. The amounts of releasedcis-verbenol (cV) increased five times during the first two days, while the amounts of MB were consistently high. The attacked spruce tree was not taken by the beetles, and the average amounts of the two aggregation pheromone components, MB and cV, increased again after the first maxima. The first peak of oxygenated monoterpene, released in the beginning of the attack containing α-terpineol, terpinen-4-ol, bornyl acetate,trans-pinocarveol, and verbenone, was possibly due to spontaneous oxidation of monoterpene hydrocarbons from the tree. Microorganisms established in the gallery wall phloem probably participated in the production of oxygenated monoterpenes during the second increase.
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    Receptor chirality and behavioral specificity of the boll weevil,Anthonomus grandis Boh. (Coleoptera: Curculionidae), for its pheromone, (+)-grandisol (1989)
    Springer
    Journal of chemical ecology 15 (1989), S. 517-528 
    Details
    ISSN: 1573-1561
    Keywords: Boll weevil ; olfaction ; receptor cell ; Anthonomus grandis ; Coleoptera ; Curculionidae ; enantiomer ; grandisol ; chirality ; electroantennogram ; aggregation pheromone ; neurobiology ; structure-activity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Electrophysiological recordings from antennal olfactory receptors and field behavioral experiments showed both male and female boll weevils,Anthonomus grandis Boh. (Coleoptera: Curculionidae), to respond specifically to (+)-grandisol, an enantiomer of compound I of the boll weevil aggregation pheromone. Single-cell recordings revealed antennal olfactory neurons in both male and female weevils keyed to (+)-grandisol. Electroantennograms in response to serial dilutions of the grandisol enaniiomers showed a threshold 100 to 1000 times lower for (+)-grandisol relative to its antipode. In field behavioral experiments, both sexes were significantly more attracted to (+)-grandisol in combination with the three other pheromone components than the combination with (−)-grandisol. When (−)-grandisol was placed with the (+)-enantiomer at equal dosages, a slight although statistically insignificant inhibition occurred. Subsequent field tests showed that the low level of attraction exhibited by (−)-grandisol in combination with the other three pheromone components could be attributed to the other three components alone. These results are in contrast with an earlier study, which found (−)-grandisol to be as attractive as the (+)-enantiomer.
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    Collection of pheromone from atmosphere surrounding boll weevils,Anthonomus grandis (1989)
    Springer
    Journal of chemical ecology 15 (1989), S. 767-777 
    Details
    ISSN: 1573-1561
    Keywords: Anthonomus grandis ; behavior ; boll weevil ; Coleoptera ; cotton ; cultivar ; Curculionidae ; effluvial method ; grandlure ; pheromone ; Pora-pak Q ; pheromone collection ; aeration collection
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract An effluvial method was developed to collect the pheromone, grandlure from actively calling male boll weevils,Anthonomus grandis Boheman. The adsorbant, Porapak Q (ethylvinylbenzene-divinylbenzene), was utilized to trap and concentrate the pheromone. Captured pheromone was desorbed from columns packed with Porapak Q by elution withn-pentane and quantified by capillary column gas-liquid chromatography. In recovery studies with known amounts of synthetic grandlure, we found that the amount of each pheromone component collected was a function of collection duration, elution volume, and initial concentration. This effluvial method was capable of recovering as much as 94.9% of a known quantity (80 μg) of grandlure. The chromatograms were free of extraneous peaks. In studies of insect-produced pheromone, the effluvial method was used to collect pheromone from the air space surrounding male boll weevils as they fed on flower buds from CAMD-E cotton. The quantity and quality of boll-weevil-produced pheromone was determined for days 6, 8, 10, 11, 12, 13, and 14 of boll weevil adulthood. The maximum quantity of natural pheromone was produced on day 13 (4.2 μg/weevil) with a pheromone component ratio of 2.41∶2.29∶0.95∶1 for components I, II, III, and IV, respectively. The effluvial method described in this report is an efficient method to collect and quantify boll weevil pheromone from the atmosphere surrounding actively calling insects. Other applications of this method are suggested.
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    Differential recognition of geometric isomers by the boll weevil,Anthonomus grandis Boh. (Coleoptera: Curculionidae): Evidence for only three essential components in aggregation pheromone (1989)
    Springer
    Journal of chemical ecology 15 (1989), S. 529-540 
    Details
    ISSN: 1573-1561
    Keywords: Boll weevil ; Anthonomus grandis ; aggregation pheromone ; multicomponent ; behavior ; electroantennogram ; neurobiology ; structureactivity ; geometric isomers ; cotton ; Coleoptera ; Curculionidae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract For two decades, the aggregation pheromone of the boll weevil,Anthonomus grandis Boh. (Coleoptera: Curculionidae), was thought to consist of four compounds: I [(+)-(Z)-2-isopropenyl-1-methylcyclobutane ethanol]; II [(Z)-3,3-dimethyl-ΔI,β-cyclohexane ethanol]; III [(Z)-3,3-dimethyl-Δ1,α-cyclohexane acetaldehyde); and IV [(E)-3,3-dimethyl-Δ1,α-cyclohexane acetaldehyde). Evidence is presented from behavioral and electrophysiological studies to show that only three of these components, I, II, and IV, are essential for attraction. Competitive field tests, in which each possible three-component blend was tested against the four-component mixture, demonstrated that omission of I, II. or IV resulted in decreased trap captures (P 〈 0.01). Trap captures by these blends lacking I, II, or IV resembled those by the hexane solvent alone in a similar experiment. However, omission of III did not significantly alter field attractiveness of the blend. Dosage-response curves constructed from electroantennogram responses of both males and females to serial dilutions of III, IV, and a 50∶50 mixture of the geometric isomers III and IV showed both sexes to be 10- to 100-fold more sensitive to IV than III. Data from the electrophysiological studies were consistent with a single acceptor type for the (E)-cyclohexylidene aldehyde, IV, for males, and possibly one or two acceptor types for III and IV for females. Possible roles for the (Z)-cyclohexylidene aldehyde, III, and implications for the pheromonal attractant currently used in boll weevil eradication/suppression programs are discussed.
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    Inhibition of attraction to aggregation pheromone by verbenone and ipsenol (1989)
    Springer
    Journal of chemical ecology 15 (1989), S. 2263-2277 
    Details
    ISSN: 1573-1561
    Keywords: Aggregation pheromone ; Ips typogmphus ; Coleoptera ; Scolytidae ; density regulation ; inhibitor ; verbenone ; ipsenol ; ipsdienol
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The semiochemicals verbenone (Vn), ipsenol (Ie), and ipsdienol (Id), present in late phases of host colonization, have been implicated as qualitative “shut-off” signals regulating attack density. Combinations of the three chemicals were released in pipe traps together with the aggregation pheromone components 2-methyl-3-buten-2-ol (MB) andcis-verbenol (cV) at different levels and in different ratios to MB + cV, and with two spacings of traps to test for possible effects on reducing catch at traps baited with aggregation pheromone. When they were released with the attractants Vn and Ie (alone or together) decreased the mean catch significantly at the higher release rates used (1 mg/day). Id alone or together with Vn at low release rates (0.1 mg/day), with the attractants, increased catch somewhat. A dose-response test of Vn, with the attractants held constant, showed a decline in catches, down to about 〈 10% of the control, at ratios of Vn to cV between 1∶1 and 150∶ 1. A larger spacing (25 m) of traps gave a stronger response to change in doses of Vn and MB + cV than a smaller (6 m) spacing. The sex ratio was more skewed towards females when two or three inhibitors were present and at higher doses of Vn. It is suggested that Vn could be the most important density-regulating signal in the natural system, as release of Vn from galleries is larger and starts earlier than that of Id and Ie.
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    Terpene alcohol pheromone production byDendroctonus ponderosae andIps paraconfusus (Coleoptera: Scolytidae) in the absence of readily culturable microorganisms (1989)
    Springer
    Journal of chemical ecology 15 (1989), S. 1433-1463 
    Details
    ISSN: 1573-1561
    Keywords: Dendroctonus ponderosae ; Ips paraconfusus ; Coleoptera ; Scolytidae ; pheromones ; terpene alcohols ; axenic-rearing ; bark beetles ; microorganisms
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Dendroctonus ponderosae Hopkins andIps paraconfusus Lanier of both sexes produced most of their complement of terpene alcohols at normal to elevated levels in the absence of readily culturable microorganisms. However, there was some evidence that microbial involvement may be required by maleI. paraconfusus to produce ipsenol and ipsdienol at normal levels. Increased levels of certain terpene alcohols found in axenically reared or streptomycin-fed beetles suggest that symbiotic microorganisms may be responsible for breaking down pheromones and other terpene alcohols. There was also evidence for microbial involvement in the production of the antiaggregation pheromone verbenone inD. ponderosae. This compound was not produced in quantifiable levels by axenically reared or streptomycin-fed beetles exposed to α-pinene as vapors or through feeding, but was found in wildD. ponderosae exposed to α-pinene through feeding on bolts of lodgepole pine,Pinus contorta var.latifolia Engelmann.
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    Secondary attraction and field activity of beetle-produced volatiles inDendroctonus terebrans (1989)
    Springer
    Journal of chemical ecology 15 (1989), S. 1513-1533 
    Details
    ISSN: 1573-1561
    Keywords: Dendroctonus terebrans ; Coleoptera ; Scolytidae ; bark beetles ; pheromones ; primary attraction ; secondary attraction ; host selection ; frontalin ; exo-brevicomin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Controlled infestation ofDendroctonus terebrans (Olivier) on bolts of slash pine,Pinus ellionii Engelm. var.elliottii, elicited greater attraction of wild conspecifics than uninfested bolts. Secondary attraction was not apparent, however, to standing slash pines that had received volunteer attacks, when compared with attraction to unattacked but susceptible trees. Hindguts from in-flight or attacking femaleD. terebrans contained frontalin, and those from in-flight or attacking males containedexo-brevicomin.Trans-pinocarveol,cis-verbenol,trans-verbenol, myrtenal, verbenone, myrtenol, and other compounds were produced by both sexes during gallery construction in host trees. Synthetic frontalin, when deployed with a standard host odor mixture of turpentine and ethanol, was very attractive to maleD. terebrans in field-trapping experiments. The addition of eitherexo-brevicomin orendo-brevicomin to the frontalin-turpentine combination negated the attractive effect of frontalin for males.Trans-verbenol, myrtenol, and verbenone had little effect onD. terebrans behavior. Responses of females did not differ among treatments in any of the 11 field experiments.
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    Electroantennograms by mountain pine beetles,Dendroctonus ponderosae Hopkins, exposed to selected chiral semiochemicals (1989)
    Springer
    Journal of chemical ecology 15 (1989), S. 2089-2099 
    Details
    ISSN: 1573-1561
    Keywords: Olfaction ; chirality ; pheromone ; semiochemical ; enantiomer ; bark beetle ; electrophysiology ; electroantennogram ; mountain pine beetle ; Dendroctonus ponderosae ; Coleoptera ; Scolytidae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Electroantennograms (EAGs) were recorded fromD. ponderosae to the enantiomers of the terpenoid bark-beetle pheromonestrans-verbenol,cis-verbenol, verbenone, and the bicyclic ketals frontalin,exo-brevicomin, andendo-brevicomin. Male and female responses to enantiomers of the terpenoids differed significantly only at the two highest concentrations. No sex differences were seen in response to the bicyclic ketals. Significantly different responses to the enantiomers of all the chemicals, except frontalin, were noted over at least part of the dosage-response ranges tested. The negative antipode for all of the terpenoids elicited higher responses, while for the bicyclic ketals, the positive antipode effected the largest responses except for the two highest concentrations ofexo-brevicomin.
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    Novel substituted B2ElVIN2 heterocycles (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 19-24 
    Details
    ISSN: 0009-2940
    Keywords: Bis(diorganoboryl)chalcogenides ; Pyrazaboles ; Pyrazoles ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Neuartige Substituierte B2ElVIN2 HeterocyclenDie Bis(diorganoboryl)chalkogenide (R2B)2O [R = C2H5 (3); R2 = 1,5-C8H14 (1)], (R2B)2S [R2 = 1,5-C8H14 (5)], und (R2B)2Se [R2 = 1,5-C8H14 (7)] reagieren mit Pyrazol (Pz) und dessen Derivaten 3-Methylpyrazol (3-MePz) und Indazol (benzo-Pz) in hohen Ausbeuten (65-92%) zu stabilen 1:1-Additionsverbindungen [z. B. 2 (El = O), 4 (El = O), 6 (El = S), 8 (El = Se)]. 1H-, 13C-, 11B-NMR-Spektren und Röntgenstrukturanalysen (von 2 und 6) zeigen eine Grundstruktur mit einem zentralen B2ElN2-Heterocyclus (El = O, S, Se). Die Reaktion von 2 mit R2BH und die Thermolyse von 4 führen zu den dimeren 1-Pyrazolylboranen 9a bzw. 9b.
    Notes: The bis(diorganoboryl) chalcogenides (R2B)2O [R = C2H5 (3); R2 = 1,5-C8H14 (1)], (R2B)2S [R2 = 1,5-C8H14 (5)], and (R2B)2Se [R2 = 1,5-C8H14 (7)] react with pyrazole (Pz) and its derivatives 3-methylpyrazole (3-MePz) and indazole (benzo-Pz) to form in high yields (65-92%) stable 1:1 adducts [e.g. 2 (El = O), 4 (El = O), 6 (El = S) and 8 (El = Se)]. 1H-, 13C-, 11B-NMR spectra and X-ray analyses (of 2 and 6) show a basic structure with a central B2ElN2 (El = O, S, Se) heterocycle. The reaction of 2 with R2BH and the thermolysis of 4 give the dimeric 1-pyrazolylboranes 9a and 9b, respectively.
    Additional Material: 3 Ill.
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    Extrem kurze Quecksilber-Quecksilber-Kontakte in peri-dimercurierten Naphthalinverbindungen (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 31-36 
    Details
    ISSN: 0009-2940
    Keywords: Mercury - mercury contacts ; Naphthalenediylmercury compounds ; Organomercury compounds ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Extremely Short Mercury-Mercury Contacts in peri-Dimercurated Naphthalene Compounds1-Naphthylmercury chloride (1) and 1,8-naphthalenediylbis(mercury chloride) (2) were prepared from the corresponding naphthyllithium precursors and HgCl2 in ca. 80% yield. In an alternative route, 2 can be obtained from 1,8-naphthalenediyldiboric acid anhydride and HgCl2 in 85% yield. The structure of 2·DMSO has been determined by X-ray diffraction methods. The lattice contains discrete adducts in which the two mercury atoms are bridged by the DMSO oxygen atom. The HgCl moieties are bent away from each other through distortions of the naphthalene framework and of the C—Hg—Cl axes, which results in a Hg ‥ Hg distance of 3.102(1) Å. - Symmetrization of 2, induced by treatment with NaI in aqueous ethanol, affords bis(μ-1,8-naphthalenediyl)dimercury (3). In the X-ray structure determination of this compound the shortest „non-bonding“ Hg·Hg contact reported in the literature has been detected: Hg1··Hg2 = 2.797(1) Å. The molecule also shows distortions in the naphthalene framework and in the C—Hg—C axes [C—Hg—C = 173.3(5)°].
    Notes: 1-Naphthylquecksilberchlorid (1) und 1,8-Naphthalindiylbis-(quecksilberchlorid) (2) werden aus den zugehörigen Naphthyllithium-Verbindungen und HgCl2 mit ca. 80% Ausbeute erhalten. Alternativ kann 2 auch aus 1,8-Naphthalindiyldiborsäureanhydrid und HgCl2 gewonnen werden (Ausbeute 85%). Von 2·DMSO wurde die Kristallstruktur bestimmt. Es liegen diskrete Addukte vor, in denen die beiden Hg-Atome durch das O-Atom des DMSO überbrückt werden. Die HgCl-Einheiten sind durch Verzerrungen im Naphthalingerüst, durch Winkelung der Achsen C—Hg—Cl und durch deren Auslenkung aus der Naphthalinebene voneinander weggebogen, so daß ein Hg·· Hg-Kontakt von 3.102(1) Å resultiert. - 2 symmetrisiert sich bei der Einwirkung von NaI in wäßrigem Ethanol unter Bildung von Bis(μ-1,8-naphthalindiyl)diquecksilber (3). Bei der Strukturanalyse dieser im Kristall zentrosymmetrischen Verbindung wurde der bisher kürzeste „nichtbindende“ Hg··Hg-Kontakt von 2.797(1) Å gefunden. Auch in 3 sind die C—Hg—C-Achsen abgewinkelt [C—Hg—C = 173.3(5)°], und das Naphthalingerüst ist verzerrt.
    Additional Material: 6 Ill.
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    Notizen N-Butyl-N′-dansylthioharnstoff als fluoreszierender Breitbandkomplexbildner (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 59-61 
    Details
    ISSN: 0009-2940
    Keywords: N-Butyl-N′-dansylthiourea ; Complexing agent, fluorescent ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: N-Butyl-N′-dansylthiourea as Fluorescent Broad-Band Complexing AgentN-Butyl-N′-dansylthiourea (2) [dansyl = 5-(dimethylamino)-1-naphthylsulfonyl] is obtained by the reaction of dansylamide (1) with butyl isothiocyanate. The compound is a stable, fluorescent complex agent for a broad spectrum of metal ions. The UV spectra and fluorescence of the ligand and some metal complexes are discussed. The fluorescence of the dansyl group is strongly affected by metal ions.
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    URL: http://dx.doi.org/10.1002/cber.19891220110
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    Synthesis and Structure of Enaminecarbaldehydes and Enamino Ketones (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 83-94 
    Details
    ISSN: 0009-2940
    Keywords: Enaminecarbaldehydes ; Enamino ketones ; hetero Diels-Alder reaction ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthese und Struktur von Enaminecarbaldehyden und Enamino KetonenDie Synthese der Enamincarbaldehyde 1a-s und 17a-c sowie der Enamino-Ketone 2a-k und deren N-Acyl-Derivate 19a-k und 21-t mit Elektronenacceptor-Substituenten an C-2 bzw an der CO-Gruppe wird beschrieben. Kondensation von 2-Formyl-3-oxopropansäure-methylester (13) mit Ammoniak und den Aminen 14b-s ergab die Enamincarbaldehyde 1a bzw. 1b-s in einer Ausbeute von 72-93%. Die Enamincarbaldehyde 17 konnten durch Formylierung von 15 mit dem gemischten Ameisensäureessigsäureanhydrid erhalten werden. Die Synthese der Enamino-Ketone 2a-k erfolgte mit einer Ausbeute von 61-97% durch Kondensation von Ammoniak und Aminen mit den Enolethern 24a-f, die durch Umsetzung reaktiver Acylchloride 23 mit Ethylvinyl-ether dargestellt wurden. Die für hetero-Diels-Alder-Reaktionen benötigten N-Acyl-Derivate 19a-k und 21-t wurden durch Acylierung des Enamincarbaldehyds 1a und der Enamino-Ketone 2a-k gebildet.
    Notes: The synthesis of enaminecarbaldehydes 1a-s and 17a-c as well as enamino ketones 2a-k, and their N-acyl derivatives 19a-k and 21-t with electron accepting substituents at C-2 and at the CO group, respectively, is described. Condensation of methyl 2-formyl-3-oxopropanoate (13) with ammonia and the amines 14b-s gave the enaminecarbaldehydes 1a and 1b-s, respectively, in 72-93% yield. The enaminecarbaldehydes 17 were obtained by formylation of 15 with acetic formic anhydride. The synthesis of the enamino ketones 2a-k was accomplished in 61-97% yield by reaction of ammonia and amines with the enol ethers 24a-f, which were formed by treatment of reactive acyl chlorides 23 with ethyl vinyl ether. The enaminecarbaldehyde 1a as well as the enamino ketones 2a-k could be acylated to give 19a-k and 2l-t, respectively, which can be used in the hetero Diels-Alder reaction.
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    URL: http://dx.doi.org/10.1002/cber.19891220114
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    Chemie der Triphenyl-(oder Tri-n-butyl-)pyridylphosphoniumsalze, 2. 2,4-Pyridindiylbis(phosphoniumsalze) (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 119-122 
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    ISSN: 0009-2940
    Keywords: Bis(phosphonium) salts ; Pyridylphosphonium salts, tri-n-butyl- and triphenyl- ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Chemistry of Triphenyl-(or Tri-n-butyl-)pyridylphosphonium salts, 2. - 2,4-Pyridinediylbis(phosphonium) Salts2,4-Pyridinediylbis(phosphonium) salts 1 react with nucleophiles to give 4-substituted products 6-8. Under radical reaction conditions the 5-position in 1a is attacked to yield 9. sodium azide transforms 1a into 8. This salt is used as starting material for 11. The removal of the phosphonium groups in 1 and in the resulting products can be carried out selectively.
    Notes: 2,4-Pyridindiylbis(phosphoniumsalze) 1 lassen sich mit nucleophilen Reaktionspartnern in die 4-substituierten Produkte 6-8 überführen. Unter radikalischen Bedingungen wird selektiv die 5-Position in 1a unter Bildung von 9 angegriffen. Nach Umsetzung mit Natriumazid entsteht zunächst das Salz 8, das als Ausgangsverbindung für 11 dient. Die Substitution der Phosphoniumgruppen aus den Edukten 1 und Produkten kann selektiv durchgeführt werden.
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    URL: http://dx.doi.org/10.1002/cber.19891220119
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    Ozonolysen von 1-Methylcyclopenten, 1-Methylcyclobuten, 5-Hexen-2-on und Naturkautschuk im Beisein von Methanol (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 145-149 
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    ISSN: 0009-2940
    Keywords: Cycloalkenes, 1-methyl- ; Ozonolysis ; Peroxyhemiacetals, cyclic ; Rubber, natural ; Tetrahydrofurans, 2-hydroperoxy- ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Ozonolyses of 1-Methylcyclopentene, 1-Methylcyclobutene, 5-Hexen-2-one and Natural Rubber in the Presence of MethanolOzonolyses of 1-methylcyclopentene (8a) and of 1-methylcyclobutene (8b) in methanol proceeded in each case in the two possible directions. The resulting methoxyperoxides 13 and 14 afforded the corresponding peroxyhemiacetals 15 and 19 by intramolecular reactions of the OOH with the corresponding carbonyl groups. Ozonolysis of 1-methylcyclobutene (8b) additionally gave the corresponding ozonide 17b and 2-hydroperoxy-5-methoxy-2-methyl-as well as 5-hydroperoxy-2-methoxy-2-methyltetrahydrofuran (16b and 18b). The mode of formation of these hydroperoxy compounds has been elucidated by ozonolyses of 5-hexen-2-one (25) and of natural rubber (28) in the presence of methanol.
    Notes: Ozonolysen von 1-Methylcyclopenten (8a) und von 1-Methylcyclobuten (8b) in Methanol verliefen jeweils nach beiden möglichen Spaltungsrichtungen. Die dabei gebildeten Methoxyhydroperoxide 13 und 14 ergaben durch intramolekulare Reaktionen der OOH- mit den Carbonylgruppen die entsprechenden Peroxyhalbacetale 15 bzw. 19. Bei der Ozonolyse von 1-Methylcyclobuten (8b) wurden zusätzlich das entsprechende Ozonid 17b sowie 2-Hydroperoxy-5-methoxy-2-methyl- und 5-Hydroperoxy-2-methoxy-2-methyltetrahydrofuran (16b und 18b) gebildet. Die Bildungsweise dieser Hydroperoxy-Verbindungen wurde durch Ozonolysen von 5-Hexen-2-on (25) und von Naturkautschuk (28) im Beisein von Methanol aufgeklärt.
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    Synthese neuer 3-substituierter Pyrrole (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 169-174 
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    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis of New 3-substituted PyrrolesThe synthesis of 3-alkyl- (4), 3-(ω-bromoalkyl)- (5), 3-iodo- (6), 3-formyl- (9a), 3-acetyl-1-(triisopropylsilyl)pyrrole (9b), of 2-[1-(triisopropylsilyl)-3-pyrrolyl]-2-propanol (7), 1-(triisopropylsilyl)-3-pyrrolecarboxylic acid (8), and 7-[1-(triisopropylsilyl)-3-pyrrolyl]heptanoic acid (10) as well as the desilylation of these products to the corresponding 3-substituted pyrroles 11 is described. Intermediates in these syntheses are 1-(triisopropylsilyl)pyrrole (1), 3-bromo- (2), and 3-lithio-1-(triisopropylsilyl)pyrrole (3).
    Notes: Die Synthese von 3-Alkyl- (4), 3-(ω-Bromalkyl)- (5), 3-Iod- (6), 3-Formyl- (9a) und 3-Acetyl-1-(triisopropylsilyl)pyrrol (9b), von 2-[1-(Triisopropylsilyl)-3-pyrrolyl]-2-propanol (7), 1-(Triisopropylsilyl)-3-pyrrolcarbonsäure (8) und 7-[1-(Triisopropylsilyl)-3-pyrrolyl]heptansäure (10) sowie die Desilylierung dieser Produkte zu den entsprechenden 3-substituierten Pyrrolen 11 wird beschrieben. Zwischenstufen der Darstellung sind 1-(Triisopropylsilyl)pyrrol (1), 3-Brom- (2) und 3-Lithio-1-(triisopropylsilyl)pyrrol (3).
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    Masthead (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989) 
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    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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    URL: http://dx.doi.org/10.1002/cber.19891220201
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    Übergangsmetall-Silyl-Komplexe, 26. Gold(I)-Silyl-Komplexe (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 223-230 
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    ISSN: 0009-2940
    Keywords: Gold(I) silyl complexes ; Transition-metal silyl complexes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Transition-Metal Silyl Complexes, 26. - Gold(I) Silyl ComplexesComplexes of type L-Au-SiR3 with L = PR′3 or PhNC and SiR3 = Si(aryl)3, Si(SiMe3)3, or SiPh2Me are prepared by reaction of L-Au-Cl with LiSiR3. Depending on L and R, their stability decreases, in the order R′3P-Au-Si(aryl)3 〉 R′3P-Au-Si(SiMe3)3 〉 R′3P-Au-SiPh2Me ≈ PhNC-Au-SiR3. Reaction of R′3P-Au-CH3 or R′3P-Au-OAc with HSiR3 does not yield silyl complexes. However, using chlorinated silanes like HSiR2Cl, CH3/Cl or OAc/Cl exchange takes place. The Mössbauer spectrum of MePh2P-Au-SiPh3 (6) and NMR- and IR-spectroscopic investigations show that silyl groups act as strong σ donors towards the gold atom. MePh2P-Au-SiPh3 (6) and MePh2P-Au-Si(SiMe3)3 (7) have been characterized by X-ray structure analyses [Au—Si 235.4(4) and 235.6(2) pm]. The Au-Si bond in MePh2P-Au-SiPh2Tol (5) is cleaved by X2 (X = Cl, Br, I), HCl or MeI, but not by H2O or MeOH.
    Notes: Komplexe des Typs L-Au-SiR3 mit L = PR′3 oder PhNC und SiR3 = Si(aryl)3, Si(SiMe3)3 oder SiPh2Me wurden durch Umsetzung von L-Au-Cl mit LiSiR3 dargestellt. Ihre Stabilität sinkt in Abhängigkeit von L und R in der Reihenfolge R′3P-Au-Si(aryl)3 〉 R′3P-Au-Si(SiMe3)3 〉 R′3P-Au-SiPh2Me ≈ PhNC-Au-SiR3. Umsetzung von R′3P-Au-CH3 oder R′3P-Au-OAc mit HSiR3 ergibt keine Silyl-Komplexe, bei Verwendung chlorierter Silane, HSi-R2Cl, findet lediglich CH3/Cl- bzw. OAc/Cl-Austausch statt. Das Mößbauer-Spektrum von MePh2P-Au-SiPh3 (6) sowie NMR- und IR-spektroskopische Untersuchungen zeigen, daß Silylreste als starke σ-Donor-Liganden gegenüber dem Goldatom wirken. MePh2P-Au-SiPh3 (6) und MePh2P-Au-Si(SiMe3)3 (7) wurden durch Röntgenstrukturanalysen charakterisiert [Au—Si 235.4(4) und 235.6(2) pm]. Die Au—Si-Bindung in MePh2P-Au-SiPh2 Tol (5) wird durch X2 (X = Cl, Br, I), HCl oder MeI, nicht aber durch H2O oder MeOH gespalten.
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    Reaktionen von Germylenen mit Aziden: Iminogermane, Azidogermane, Tetrazagermole und Hexaazadigermadispirododecane (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 245-252 
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    ISSN: 0009-2940
    Keywords: Germylenes ; Germanium nitrogen compounds ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reactions of Germylenes with Azides: Iminogermanes, Azidogermanes, Tetrazagermoles and HexaazadigermadispirododecanesGermylenes, X2Ge, stabilized by steric blocking and/or incorporation into five-membered ring systems, react with azido compounds YN3 depending on the steric requirements of the substituents X and Y to give iminogermanes, X2Ge=NY (1, 2) azidogermanes X2Ge(N3)NY2 (6-8) tetrazagermoles, X2Ge(— NY — N =)2 (10-16), and hexaazadigermadispirododecanes, [(— NR — CH2 — CH2 — NR —)Ge(μ-NY -)]2 (17, 18). NMR (1H, 13C, 14N, 15N, and 29Si), MS data, and X-ray structure analyses of the compounds 8, 9, 16, and 18 are reported.
    Notes: Durch sterische Blockierung und/oder Einbau in fünfgliedrige Ringsysteme stabilisierte Germylene, X2Ge, reagieren mit Azidoverbindungen, YN3, in Abhängigkeit von der Raumerfüllung der Substituenten X und Y zu Iminogermanen X2 Ge=NY (1, 2), Azidogermanen, X2Ge(N3)NY2 (6′8), Tetrazagermolen, X2Ge-(-NY-N=)2 (10-16), bzw. Hexaazadigermadispirododecanen, [(—NR—CH2—CH2—NR— )Ge(μ-NY-)]2 (17, 18). NMR-(1H, 13C, 14N, 15N und 29Si), MS-Daten und Röntgenstrukturanalysen für die Verbindungen 8, 9, 16 und 18 sind angegeben.
    Additional Material: 4 Ill.
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    (Trifluormethyl)germane, III. Darstellung neuer (Trifluormethyl)germanium-Chalkogen-Verbindungen (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 271-277 
    Details
    ISSN: 0009-2940
    Keywords: Chalcogenogermanes, (trifluoromethyl)- ; Disilaselenanes ; Germachalcogenanes, bis(trifluoromethyl)- ; Germanes, (trifluoromethyl)- ; Germatranes, (trifluoromethyl)- ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: (Trifluormethyl)germanes, III. - Preparation of New (Trifluormethyl)germanium Chalcogene CompoundsStarting with the dihalogenobis(trifluoromethyl)germanes (CF3)2-GeX2 (X = Cl, or I), halogen-chalcogen exchange leads to corresponding chalcogen derivatives of the general type [(CF3)2GeE]n (6, 7) (E = O, NH, S, or Se). The resulting compounds differ in their degree of polymerisation. [(CF3)2GeO]x and the corresponding sesquioxane [(CF3)GeO1, 5]x are highly polymeric, quite in contrast to the corresponding germathianes and -selenanes. The crystal structure of [(CF3)2GeO]x (6a) was determined by X-ray single crystal diffraction. The reaction of CF3GeCl3 with triethanolamine results in the formation of 1-(trifluoromethyl)germatrane (13). Disilaselenane (10) reacts at low temperatures with chloro-(trifluoromethyl)germanes (CF3)nGeCl4-n under retention of one Si—Se bond to give (CF3)nGe(SeSiH3)4-n (11) and H3SiCl. Compounds with n = 3 and 2 could be isolated. Exchange of iodine by ECF3 takes place with iodogermanes (CF3)nGeI4-n and Hg(ECF3)2 (E = S, Se) with formation of a complete series of (trifluoromethyl)(trifluoromethylchalcogeno)germanes (CF3)nGe-(ECF3)4-n (3, 5).
    Notes: Durch Halogen-Chalkogen-Austauschreaktionen an (CF3)2)GeX2 (X = Cl, I) wurden Bis(trifluormethyl)germachalkogenane [(CF3)2GeE]n (6, 7) E = O, NH, S, Se) von unterschiedlichem Oligomerisierungsgrad erhalten. Die Germoxane [(CF3)2GeO]x und (CF3GeO1,5)x sind im Gegensatz zu den homologen Germathianen und -selenanen polymer, wobei die Struktur von [(CF3)2GeO]x (6a) durch eine Kristallstrukturanalyse ermittelt wurde. Durch Umsetzung von CF3GeCl3 mit Triethanolamin wird 1-(Trifluormethyl)germatran (13) erhalten. Disilaselenan (10) reagiert bei tiefen Temperaturen mit den Chlor (trifluormethyl)-germanen (CF3)nGeCl4-n monofunktionell unter Erhalt einer Si—Se-Bindung zu (CF3)nGe(SeSiH3)4-n (11) und H3SiCl, von denen die Verbindungen mit n = 3 und 2 isoliert werden konnten. Reaktionen der Iodgermane (CF3)nGeI4-n(1) mit Hg(ECF3)2) (E = S, Se) führen unter Substitution des Iods gegen die ECF3-Gruppen zur vollständigen Reihe der (Trifluormethyl)(trifluormethylchalkogeno)germane (CF3)nGe(ECF3)4-n (3, 5).
    Additional Material: 3 Ill.
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    Synthesis and Properties of a (Phthalocyaninato)copper(II) Complex Symmetrically Substituted with Eight Crown Ethers (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 291-292 
    Details
    ISSN: 0009-2940
    Keywords: (Phthalocyaninato)copper complex, substituted with crown ethers ; Alkali metal extraction ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A soluble (phthalocyaninato)copper(II) complex containing eight symmetrical benzo-15-crown-5 substituents, namely {2,3,9,10,16,17,23,24-octakis[[benzo-15-crown-5)-4′ -yl]oxymethyl]phthalocyaninato}copper(II) (2) from 1,2-bis{[benzo-15-crown-5)-4′-yl]oxymethyl}-4,5-dibromobenzene (1) and CuCN in quinoline or pyridine was synthesized. The crown-ether groups in 2 were shown to prefer intramolecular complexation with alkali metal ions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19891220214
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    Sterische Hinderung der C—C-Rotation durch zwei SF5-Gruppen (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 463-466 
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    ISSN: 0009-2940
    Keywords: C—C Rotation ; Sterical hindrance by SF5 groups ; Rotational barriers ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Sterical Hindrance of the C—C Rotation by two SF5 GroupsAddition of SF5Cl to SF5CH=CF2 gives products carrying two SF5 groups on one carbon atom. As a consequence, C—C single bond rotation is strongly hindered. The highest rotational barrier observed is 61.7 kJ mol-1, rotational isomers are hence detectable at room temperature.
    Notes: Die Addition von SF5Cl an SF5CH=CF2 ergibt Produkte, die zwei SF5-Gruppen an einem Kohlenstoff tragen. In diesen kommt es zu einer starken Hinderung der Rotation um die C—C-Einfachbindung. Die höchste Rotationsbarriere wird mit 61.7 kJ mol-1 gefunden, d. h. Rotationsisomere sind bei Raumtemperatur getrennt nachweisbar.
    Additional Material: 4 Ill.
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    URL: http://dx.doi.org/10.1002/cber.19891220311
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    Synthese, Struktur und Reaktionen von 1,2,3,6-Tetrahydro-1,2,3,6-diphosphadiborin-Derivaten (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 467-472 
    Details
    ISSN: 0009-2940
    Keywords: Tetracarbonylchromium complexes ; 1,2,3,6-Tetrahydro-1,2,3,6-diphosphadiborine derivatives ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis, Structure, and Reactions of 1,2,3,6-Tetrahydro-1,2,3,6-diphosphadiborine DerivativesThe 1,2,3,6-tetrahydro-1,2,3,6-diphosphadiborine derivatives 3a and 3b are obtained by cyclocondensation of 1,2-bis[chloro(dialkylamino)boryl]ethenes 2 and 1,2-dipotassium 1,2-di-tert-butyldiphosphanediide. As in the case of 2,5-dihydro-1H-1,2,5-phosphadiborole derivatives 1 the temperature-dependent 1H-NMR spectra of 3b exhibit a lowered barrier of inversion at phosphorus. The X-ray structure analysis of 3b shows, that the six-membered C2B2P2 ring is nonplanar and the P atoms are coordinated pyramidally. Attempts to substitute the dialkylamino groups at the boron atoms of 3a and 3b with HCl·Et2O or tBuLi lead to cleavage of the B—P bonds. Reaction between 3a or 3b and Cr(CO)3(MeCN)3 does not result in the formation of tricarbonylchromium complexes but of tetracarbonylchromium complexes 6a and 6b with pentahapto-bonded ligands 3a and 3b.
    Notes: Die 1,2,3,6-Tetrahydro-1,2,3,6-diphosphadiborin-Derivate 3a und 3b entstehen durch Cyclokondensation aus 1,2-Bis[chlor(dialkylamino)boryl]ethenen 2 und 1,2-Dikalium-1,2-di-tert-butyldiphosphandiid. Die Temperaturabhängigkeit der 1H-NMR-Spektren von 3b dokumentiert wie bei 2,5-Dihydro-1H-1,2,5-phosphadiborol-Derivaten 1 eine erniedrigte Phosphor-Inversionsbarriere. Die Röntgenstrukturanalyse von 3b zeigt, daß der C2B2P2-Sechsring im Kristall nicht eben ist und daß die P-Atome pyramidal koordiniert sind. Versuche zur Substitution der Dialkylaminogruppen an den Boratomen von 3a und 3b mit HCl·Et2O oder tBuLi führen zur Spaltung der B—P-Bindungen. Die Umsetzung von 3a bzw. 3b mit Cr(CO)3(MeCN)3 ergibt keine Tricarbonylchrom-Komplexe, sondern die Tetracarbonylchrom-Komplexe 6a bzw. 6b, in denen die Liganden 3a und 3b pentahapto gebunden sind.
    Additional Material: 7 Tab.
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    Organische Synthesen mit Übergangsmetallkomplexen, 34 Neuartiger Aufbau von C = C-Bindungen durch Kondensation von Carbenkomplexen mit Säureamiden unter Insertion von C2-Einheiten in M=C-Bindungen (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 365-370 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Organic Synthesis via Transition Metal Complexes, 34. - Novel Formation of C=C Bonds by Condensation of Acid Amides with Carbene Complexes Involving an Insertion of C2 Units into M=C BondsCarben complexes LnM=C(OEt)C6H5 1 [LnM = Cr(CO)5, Mo(CO)5, W(CO)5] and acid amides RCH2CONMe2 2 undergo a novel condensation reaction in presence of POCl3/Et3N to give alkenyl aminocarbene complexes 3. The reaction involves an insertion of a C2 unit of 2 into the M=C bond of 1 to give a C=C bond. It can be achieved with open-chain and cyclic amides like N-methyl-2-pyrrolidone (8). the structures of the complexes have been determined spectroscopically. A mechanism of the reaction is suggested.
    Notes: Carbenkomplexe LnM=C(OEt)C6H5 1 [LnM = Cr(CO)5, Mo(CO)5, W(CO)5] lassen sich mit Säureamiden RCH2CONMe2 2 und POCl3/Et3N zu Alkenyl-Aminocarben-Komplexen 3 kondensieren. Dabei wird eine C2-Einheit von 2 in die M=C-Bindung von 1 eingeschoben und eine C=C-Bindung neu geknüpft. Die Reaktion gelingt mit offenkettigen und cyclischen Amiden wie N-Methyl-2-pyrrolidon (8). Die Strukturen der Komplexe wurden spektroskopisch ermittelt und Vorschläge zur Deutung des Reaktionsablaufs gemacht.
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    Azulen und 1,6-Methano[10]annulen als Dienophile in der Diels-Alder-Reaktion mit 3,6-Bis(trifluormethyl)-1,2,4,5-tetrazin (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 711-714 
    Details
    ISSN: 0009-2940
    Keywords: Azulenes ; 1,6-Methano[10]annulenes ; 1,2,4,5-Tetrazine ; [4 + 2] Cycloadditions, „inverse“ ; Pyridazines, annulated ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Azulene and 1,6-Methano[10]annulene as Dienophiles in the Diels-Alder Reaction with 3,6-Bis(trifluoromethyl)-1,2,4,5-tetrazineThe LUMO-diene-controlled [4 + 2] cycloadditions of azulene (2) and 1,6-methano[10]annulene (14) with the electron-deficient s-cisfixed diazadiene system of 3,6-bis(trifluoromethyl)-1,2,4,5-tetrazine (1) are described. Contrary to expectation, 1 reacts under unusually mild conditions with 2 (or its valence tautomer 3) to yield the adduct 4 which after N2 elimination rearranges to the benzo[f]phthalazine 11. The Diels-Alder reaction of 1 with 14 (or its valence tautomer 13) leads to the annulated dihydropyridazines 15 and 16, which can be dehydrogenated by silver(I) oxide to the methano-bridged aromatic cyclodecapyridazine 17 and the olefinic phthalazino[5,6-f]phthalazine 18, respectively. Besides, the methano-bridged cyclodeca[d]pyridazine 24 is prepared.
    Notes: LUMO-Dien-kontrollierte [4 + 2]-Cycloadditionen von Azulen (2) und 1,6-Methano[10]annulen (14) an das elektronenarme, s-cis-fixierte Diazadiensystem von 3,6-Bis(trifluoromethyl)-1,2,4,5-tetrazin (1) werden beschrieben. Wider Erwarten reagiert 1 unter ungewöhnlich milden Bedingungen mit 2 (oder dessen Valenztautomerem 3) zum Addukt 4, das nach N2-Eliminierung und nachfolgender Umlagerung das Benzo[f]phthalazin 11 liefert. Die Diels-Alder-Reaktion von 1 mit 14 (oder dessen Valenztautomer 13) führt zu den beiden anellierten Dihydropyridazinen 15 und 16, die mit Silber(I)-oxid zu dem Methano-überbrückten aromatischen Cyclodecapyridazin 17 bzw. dem olefinischen Phthalazino[5,6-f]phthalazin 18 dehydriert werden können. Daneben wird das Methano-überbrückte Cyclodeca[d]pyridazin 24 dargestellt.
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    On the Thermal Cycloisomerization of Long-Chain Alkylacetylenes in the Gas Phase (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 715-719 
    Details
    ISSN: 0009-2940
    Keywords: Alkyne ; Carbene ; Cycloisomerization ; Pyrolysis ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Über die thermische Cycloisomerisierung langkettiger Alkylacetylene in der GasphaseDie thermische Cycloisomerisierung einiger Alkylacetylene wurde in einem Laborrohrreaktor aus Quarzglas untersucht. 1-Hexin (1) wird dabei durch 1,2-H-Verschiebung und 1,5-C,H-Insertion des intermediär gebildeten Pentylidencarbens (vgl. Schema 1) in 3-Methyl-1-cyclopenten (5) umgelagert. 5-Methyl-1-hexin (2) reagiert analog; es entsteht 3,3-Dimethyl-1-cyclopenten (6). Im Gegensatz zur Bildung von in 3-Stellung methylierten Cyclopentenen aus 1-Alkinen ensteht aus 2-Hexin (3) 1-Methyl-1-cyclopenten (7). Offenbar ist die Acetylen-Vinyliden-Umlagerung nicht auf 1,2-H-Verschiebung beschränkt. Der Mechanismus der Cycloisomerisierung von Alkylacetylenen wird durch Untersuchungen mit D-markierten Alkinen bestätigt. Die Ergebnisse lassen den Schluß zu, daß die Cycloisomerisierung ohne weiteres mit dem überwiegend nach einem Radikalketten-Mechanismus verlaufenden thermischen Zerfall konkurrieren kann.
    Notes: The thermal cycloisomerization of some alkylacetylenes was investigated in a tubular quartz reactor. At 570°C 1-hexyne (1) rearranges to 3-methyl-1-cyclopentene (5) with a selectivity of about 27 by a reaction sequence including an acetylene-vinylidene rearrangement and 1,5-C,H insertion of the intermediately formed alkylidenecarbene species. 5-methyl-1-hexyne (2) behaves analogously forming 3,3-dimethyl-1-cyclopentene (6), while 2-hexyne (3) provides 1-methyl-1-cyclopentene (7) indicating that the acetylene-vinylidene rearrangement is obviously not restricted to 1,2-H shifts. The mechanism of the cycloisomerization of alkylacetylenes is investigated by means of D-labeled parent alkynes. The results show that the unimolecular cycloisomerization via alkylidenecarbenes obviously can be an important channel despite the dominance of a radical chain course.
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    Methoxy- and Aminoisocyanate (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 745-748 
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    ISSN: 0009-2940
    Keywords: Flash Pyrolysis ; Matrix IR spectroscopy ; Photolysis ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Methoxy- und AminoisocyanatMethoxyisocyanat (1) kann durch Photolyse von Azidoameisensäure-methylester (3) oder Pyrolyse von N-Methoxycarbonyl-O-methylhydroxylamin (4) dargestellt werden. Aminoisocyanat (2) ist auf ähnliche Weise durch Photolyse von Carbamoylazid (12) und Pyrolyse von Carbazinsäure-methylester (13) oder 3,4-Diaminofurazan (14) zugänglich. Die IR-Spektren von 1 und 2, aufgenommen in einer Argon-Matrix bei 10 K, werden diskutiert.
    Notes: Methoxyisocyanate (1) can be prepared by photolysis of methyl azidoformate (3) or pyrolysis of N-methoxycarbonyl-O-methyl-hydroxylamine (4). Aminoisocyanate (2) is similarly formed on photolysis of carbamoyl azide (12) and pyrolysis of either methyl carbazate (13) or 3,4-diaminofurazan (14). The infrared spectra of 1 and 2 in an argon matrix at 10 K have been measured, and some of their properties are discussed.
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    Infrared Spectra and Photochemistry of Isodiazene and Its Deuterated Isotopomers (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 749-752 
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    ISSN: 0009-2940
    Keywords: Matrix isolation ; Photochemistry ; Theoretical vibrational spectra ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Infrarot-Spektren und Photochemie von Isodiazen und seinen deuterierten IsotopomerenDie Matrixisolation von Aminoisocyanat eröffnet einen neuen ergiebigen Weg zur Darstellung von Isodiazen (Aminonitren). Damit ist es möglich geworden, nicht nur sein IR-Spektrum eindeutig festzulegen und mit Hilfe von ab-initio-Rechnungen zu interpretieren, sondern auch seine Photochemie zu untersuchen.
    Notes: The matrix isolation of aminoisocyanate opens a new efficient route for the preparation of isodiazene (aminonitrene). Its infrared spectrum can now, with the help of ab initio calculations, be interpreted, and its photochemistry can be studied.
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    Further Thienylchalcones, II (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 795-796 
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    ISSN: 0009-2940
    Keywords: Thiochalcones ; Thienylchalcones ; Fries rearrangement ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Four new thienylchalcones (1, 4, 5, and 6) were synthesized by condensing hydroxy-nitroacetophenones with 2-thiophene and 3-thiophenecarboxaldehydes in the presence of dilute NaOH.
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    Valenzisomerisierungen, 17. Persubstituierte cis-9,10-Dihydronaphthaline und ihre Valenzisomerisierungen (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 767-779 
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    ISSN: 0009-2940
    Keywords: Molecular twisting ; cis-9,10-Dihydronaphthalenes, persubstituted ; Valence isomerizations ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Valence Isomerizations, 17. - Persubstituted cis-9,10-Dihydronaphthalenes and their Valence IsomerizationsThe tricyclic diester 10 is available from 2-butyne in a six-step synthesis with an overall yield of 10%. Thermolysis of 10 gives the bicyclic diester 11 which upon UV irradiation yields 12 as the first persubstituted cis-9,10-dihydronaphthalene. X-ray analysis of 12 shows the molecule considerably twisted along the central bond. In addition, the planes of the ester groups are at an angle of approximately 60° to the „planes“ of the six-membered rings so that conjugation of the diene systems with the carbonyl functions is virtually interrupted, an effect which is reflected by the unusual spectroscopic properties of 12. The same structural features can be found in decamethyl-cis-9,10-dihydronaphthalene (16). When heated slightly, 12 is converted to the tetracyclic valence isomer 34. On reduction of 12 with diisobutylaluminum hydride both, dihydronaphthalene dicarbinol 25 as well as its unexpected positional isomer 26, are formed depending on the reaction conditions. Etherification of the reduction products with CH2N2/Et2O—BF3 furnishes a mixture of the three isomeric bis(methoxymethyl) compounds 31, 32 and 33. They can be separated by chromatography in the cold, but revert to the mixture of the three isomers at room temperature. We consider diradical 38 to be the intermediate of this intriguing valence isomerization.
    Notes: Der tricyclische Diester 10 ist in sechs Stufen in einer Gesamtausbeute von 10% aus 2-Butin zugänglich. Thermolyse von 10 liefert den Bicyclus 11, bei dessen UV-Bestrahlung das erste persubstituierte cis-9,10-Dihydronaphtalin 12 gebildet wird. Eine Röntgenstrukturanalyse von 12 beweist die starke Verdrillung des Moleküls um die zentrale Bindung. Die Ebenen der Ester-Gruppen stehen ungefähr in einem 60°-Winkel zu den Sechsring-„Ebenen“, so daß die Konjugation der Dien-Systeme mit den Carbonyl-Funktionen praktisch unterbrochen ist, ein Effekt, der sich in den ungewöhnlichen spektroskopischen Eigenschaften von 12 widerspiegelt. Analoge Strukturmerkmale gelten auch für das Decamethyl-cis-9,10-dihydronaphthalin (16). Bicyclus 12 wandelt sich bei leichtem Erwärmen in den valenzisomeren Tetracyclus 34 um. Reduktion von 12 mit Diisobutylaluminiumhydrid gibt je nach den Reaktionsbedingungen das Dihydronaphthalindicarbinol 25 bzw. das unerwartete Stellungsisomere 26. Veretherung der Reduktionsprodukte mit CH2N2/Et2O—BF3 liefert ein Gemisch der drei isomeren Bis(methoxymethyl)-Verbindungen 31, 32 und 33, die chromatographisch in der Kälte trennbar sind, aber schon bei Raumtemperatur wieder das Gemisch der drei Isomeren zurückbilden, wobei das Diradikal 38 als Zwischenprodukt dieser erstaunlichen Valenzisomerisierung anzunehmen ist.
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    Strukturen von Pentaarylbismut-Verbindungen (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 803-808 
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    ISSN: 0009-2940
    Keywords: Bismuth organic compounds ; Fluorinated aromatic rings ; Square pyramidal bismuth ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Structures of Pentaarylbismuth CompoundsPentaarylbismuth compounds were synthesized by the known reaction Ar3BiX2 + 2 Ar′Li → 2 LiX + BiAr3Ar′2. Whenever possible they were characterized by single-crystal X-ray structure determination. In two cases almost ideal square-pyramidal geometry was found, in a third case there were two different molecules in the unit cell, both again with square-pyramidal geometry. None of these novel bismuth pentaaryls exhibit the deep coloration and the dichroism of Bi(C6H5)5.
    Notes: Pentaarylbismut- Verbindungen wurden durch die bekannte Reaktion BiAr3X2 + 2 Ar′Li → 2 LiX + BiAr3Ar′2 hergestellt und, soweit möglich, durch Röntgenbeugung an Einkristallen strukturell untersucht. In zwei Fällen erwies sich die Struktur als nahezu ideal quadratisch-pyramidal, in einem dritten Fall wurden zwei unterschiedliche Moleküle im Kristall gefunden, die aber beide wiederum quadratisch-pyramidal sind. Keines der hier vorgestellten neuen Bismutpentaaryle zeigt die tiefe Färbung und den Dichroismus von Bi(C6H5)5.
    Additional Material: 5 Ill.
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    Über sterisch gehinderte freie Radikale, XIX. Stabile 4,4′,4″-trisubstituierte Triphenylmethyl-Radikale (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 533-535 
    Details
    ISSN: 0009-2940
    Keywords: Free radicals ; Triphenylmethyl radicals ; ESR measurements ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Sterically Hindered Free Radicals, XIX. - Stable 4,4′,4″-Trisubstituted Triphenylmethyl RadicalsThe title radicals (4-R—C6H4)3C. (1), R = F, Cl, Ph, OMe, NO2, tBu, OEt, SMe, CN, CF3, have been prepared, the latter four for the first time, and the ESR spectra have been recorded. aoH, amH, and apR are listed. The intensities of the ESR signals remain constant within the accessible range of -30 to + 100°C. Within this range these radicals are kinetically stable and do not dimerize like other trityls by, e.g., α,p-, α,o-, α,α -recombinations.
    Notes: Die Titelradikale (4-R—C6H4)3C· (1), R = F, Cl, Ph, OMe, NO2, tBu, OEt, SMe, CN, CF3, wurden dargestellt, davon die vier letzten erstmalig, und mittels ESR-Spektroskopie vermessen. aoH, amH und apR werden angegeben. Die ESR-Signale bleiben im gesamten zugänglichen Temperaturbereich - 30 bis + 100°C in ihrer Intensität unverändert. Daraus folgt, daß alle diese Radikale im genannten Temperaturbereich kinetisch stabil sind, also nicht wie andere Trityle zu Dimerisierungen, etwa α,p-, α,o-, α,α-, neigen.
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    Neuartige Produkte der Weiss-Reaktion von 1,2-Cyclopentandion Verbesserte Herstellung von [3.3.3]Propellan-3,7-dion (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 523-531 
    Details
    ISSN: 0009-2940
    Keywords: Dicyclopenta-s-indacene ; 2-Osxa[3.3.3]propellane derivatives ; Pentalene derivatives ; [3.3.3]Propellane-3,7-dione ; Weiss reaction ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Novel Products in the Weiss Reaction of 1,2-Cyclopentanedione. Improved Preparation of [3.3.3]Propellane-3,7-dioneThe reaction of 1,2-cyclopentanedione (1c, 9) with the 3-oxoglutarate 4 in methanol/water in the presence of sodium bicarbonate followed by hydrolysis and decarboxylation of the product mixture affords the oxa[3.3.3]propellane ester 11c in addition to the [3.3.3]propellanedione 6c. The alkali enolates of 4 react with 9 in boiling methanol to yield the yellow, poorly soluble alkali dihydropentalenolates 12M and the [3.3.3]propellane tetraester 5c, which on hydrolysis and decarboxylation yields 53% of 6c. The dihydropentalenol 12H equilibrates with the tautomeric β-oxodiester 13, the proportion of which increases with solvent polarity. In methanol solutions, 12H and 13 add diastereoselectively forming the dicyclopenta-s-indacene tetraester syn-14, which is derived from a novel pentacyclic ring system. The configuration of syn-14 is determined by X-ray diffraction analysis. The mechanisms of formation are discussed for 11c, 12M, and syn-14.
    Notes: Nach Umsetzung von 1,2-Cyclopentandion (1c, 9) mit dem 3-Oxoglutarsäureester 4 in Methanol/Wasser in Gegenwart von Natriumhydrogencarbonat, saurer Hydrolyse und Decarboxylierung des Produktgemischs erhält man neben dem [3.3.3]Propellandion 6c den Oxa[3.3.3]propellanester 11c. Die Alkali-Enolate von 4 reagieren mit 9 in siedendem Methanol zu den gelben, schwer löslichen Dihydropentalenolaten 12M und dem [3.3.3]Propellantetraester 5c, der nach Hydrolyse und Decarboxylierung 53% 6c ergibt. Das Dihydropentalenol 12H liegt im Gleichgewicht mit dem tautomeren β-Oxodiester 13 vor, dessen Anteil mit der Polarität des Lösungsmittels zunimmt. In Methanol addieren sich 12H und 13 diastereoselektiv und bilden den Dicyclopenta-s-indacentetraester syn-14, der sich von einem neuartigen, pentacyclischen Ringsystem ableitet. Die Konfiguration von syn-14 wird durch Röntgenstrukturbestimmung aufgeklärt. Die Mechanismen der Bildung von 11c, 12M und syn-14 werden diskutiert.
    Additional Material: 2 Ill.
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    Aminosäuren, 15. Diastereoselektive Addition von Thiocarbonsäuren an 1-(Methacryloyl)prolin- und -prolinol-Derivate (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 553-559 
    Details
    ISSN: 0009-2940
    Keywords: Amino acids ; Diastereoselective addition ; 1-(Methacryloyl)proline derivatives ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Amino Acids, 15. - Diastereoselective Addition of Thiocarboxylic Acids to 1-(Methacryloyl)proline and-prolinol DerivativesThiocarboxylic acids 6 add to 1-(methacryloyl)-substituted proline and prolinol derivatives stereoselectively to give the 1-[3-(acylthio)-2-methylpropionyl]proline and -prolinol derivatives 7,7′ and 9. The less soluble (2S,2′R)-diastereomers are obtained in optical yields ≥ 98% by digestion of the crude products, the configuration of which was determined by acid hydrolysis of (2S,2′R)-7,7′ to (R)-3-mercapto-2-methylpropionic acid [(R)-8]. The stereoselectivity of the additions may be explained by a sevenmembered ring intermediate with an intramolecular H bridge, to which the S-nucleophiles add preferentially to give the compounds with the (2′R)-configuration.
    Notes: Thiocarbonsäuren 6 addieren stereoselektiv mit hohen optischen Ausbeuten an 1-(Methacryloyl)-substituierte Prolin- und Prolinol-Derivate zu den 1-[3-(Acylthio)-2-methylpropionyl]prolin-und -prolinol-Derivaten 7,7′ und 9. Durch Digerieren der Rohprodukte mit Diethylether werden die schwerer löslichen (2S,2′R)-Diastereomeren in optischen Ausbeuten ≥98% erhalten, deren Konfiguration durch Acidolyse von (2S,2′R)-7,7′ zu (R)-3-Mercapto-2-methylpropansäure [(R)-8] bewiesen wurde. Die Stereoselektivität der Additionen wird über einen Siebenring mit intramolekularer H-Brücke als Zwischenstufe, an die Schwefelnucleophile bevorzugt unter Bildung der (2′R)-Konfiguration addieren, gedeutet.
    Additional Material: 10 Tab.
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    Aminosäuren, 14. Diastereoselektive Addition von Benzolsulfenylchlorid an 1-Acryloylprolinester (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 545-551 
    Details
    ISSN: 0009-2940
    Keywords: Amino acids ; Diastereoselective addition ; 1-Acryloylproline esters ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Amino Acids, 14. - Diastereoselective Addition of Benzenesulfenyl Chloride to 1-Acryloylproline Esters(S)-Proline esters (S)-1 react with acryloyl chloride (2) to give 1-acryloylproline esters (S)-3 in good yields. Addition of benzenesulfenyl chloride (6) to (S)-3 at -95°C in dichloromethane results in 1-[2-chloro-3-(phenylthio)propionyl]proline esters (2S,2′R/2S,2′S)-7. The diastereoselectivity of the addition depends on the conformer ratio 3′/3″ of the starting material (S)-3. The diastereomers are separated by MPLC. Configuration at C-2′ of the resulting main products (2S,2′S)-7 was proved by independent synthesis. The diastereoselectivity of the addition of 6 to (S)-3 is interpreted to result from formation of a complex of the benzenesulfenyl cation with the proline ester group and subsequent electrophilic addition to a thiiranium intermediate B with (2S,2′R) configuration; the (2S,2′S) diastereomeric adduct 7 then results by nucleophilic attack of chloride at C-2′ under ring opening.
    Notes: Die 1-Acryloylprolinester (S)-3 werden durch N-Acylierung der Prolinester (S)-1 mit Acryloylchlorid (2) in guten Ausbeuten hergestellt; sie addieren Benzolsulfenylchlorid (6) bei -95°C in Dichlormethan mit hoher Diastereoselektivität zu 1-[2-Chlor-3-(phenylthio)propionyl]prolinestern (2S,2′R/2S,2′S)-7, die mittels MPLC getrennt werden. Die Diastereoselektivität der Addition hängt vom Konformerenverhältnis 3′/3″ der Edukte (S)-3 ab. Der Beweis der Konfiguration an C-2′ der als Hauptprodukte anfallenden Diastereomeren (2S,2′S)-7 wird durch eine unabhängige Synthese erbracht. Die Diastereoselektivität der Addition von 6 an (S)-3 wird über eine Komplexbildung des Phenylsulfenylkations mit der Prolinestergruppe und eine sich anschließende elektrophile Reaktion zu einer Thiiranium-Zwischenstufe B mit (2S,2-R)-Konfiguration gedeutet; das (2S,2′S)-diastereomere Additionsprodukt 7 entsteht dann durch nucleophilen Angriff des Chlorids an C-2′ unter Ringöffnung.
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    Synthesis and Structure of W2Cl4{μ-(iPr2PCH2CH2CH2PiPr2)}2: A Tungsten - Tungsten Quadruple Bond Bridged by Bulky Chelating Diphosphines (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 851-855 
    Details
    ISSN: 0009-2940
    Keywords: Diphosphines ; Tungsten - tungsten quadruple bond ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthese und Struktur von W2Cl4{μ(iPr2PCH2CH2CH2PiPr2)}2: Eine durch sperrige, chelatisierende Diphosphane überbrückte Wolfram - Wolfram-VierfachbindungDie Reduktion von WCl4 in THF durch zwei Äquivalente Na/Hg in Gegenwart des sperrigen, chelatisierenden Diphosphinopropans iPr2PCH2CH2CH2PiPr2 (dippp) liefert den violetten, zweikernigen Komplex W2Cl4(μ-dippp)2. Der Komplex besitzt eine W-W-Vierfachbindung und β-Struktur, d.h. die chelatisierenden Diphosphinopropan-Liganden verbrücken die beiden Metall-Zentren. Die 1H-NMR-spektroskopischen Daten zeigen Tieffeldverschiebungen für die dippp-Liganden, die im Einklang mit der β-Struktur stehen. Das 31P{1H}-NMR-Spektrum besteht aus einem Singulett mit 183W-Satelliten. Die Röntgen-Stukturanalyse ergibt für die β-Struktur einen Torsionswinkel P-W-W-P von 75.9° und eine W-W-Bindungslänge von 2.297(1) Å. Aus den Molekülstruktur-Daten und den 1H-NMR-Tieffeldverschiebungen kann die diamagnetische Anisotropie χ der W-W-Vierfachbindung mit - 3000 ± 300 × 10-36 m3/Molekül abgeschätzt werden. Die für den festen Zustand beobachtete Chiralität wird auch in Lösung beibehalten.
    Notes: The reduction of WCl4 in THF by two equivalents of Na/Hg in the presence of the bulky chelating diphosphine iPr2PCH2-CH2CH2PiPr2 (dippp) generates the purple, binuclear complex W2Cl4(μ-dippp)2. The quadruply-bonded molecule has a β structure, that is, the chelating diphosphine bridges the two metal centers. 1H-NMR spectral data show downfield shifts for the ligand protons consistent with the β structure. The 31P{1H}-NMR spectrum consists of a singlet with 183W satellites. The X-ray crystal structure has a twist angle (P-W-W-P torsion angle) of 75.9°, and the W-W bond length is 2.297(1) Å. Using the solidstate data and the observed downfield shifts in the 1H-NMR spectrum, the diamagnetic anisotropy χ has been estimated as - 3000 ± 300 × 10-36 m3/molecule. The chiral structure observed in the solid phase is retained in solution.
    Additional Material: 4 Ill.
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    URL: http://dx.doi.org/10.1002/cber.19891220509
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    Synthese und Charakterisierung von 1,3,2λ5,4-Thiazaphosphaboretidinen (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 861-864 
    Details
    ISSN: 0009-2940
    Keywords: Aminoiminophosphanes ; 1,3,2λ5,4-Thiazaphosphaboretidines ; 1,2,4,3,5-Trithiadiborolanes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis and Characterization of 1, 3, 2λ5, 4-ThiazaphosphaboretidinesThe reaction of 1,2,4,3,5-trithiadiborolanes with silylated aminoiminophosphanes leads to the 1,3,2λ5,4-thiazaphosphaboretidines 1a-i. The formation of 1h, i is accompanied by an exchange of the substituents bonded to the N atoms. 1H-, 11B-, 13C-, 29Si-, 31P-NMR, and mass spectra are discussed.
    Notes: Die Umsetzung von 1,2,4,3,5-Trithiadiborolanen mit silylierten Aminoiminophosphanen führt zu den 1,3,2λ5,4-Thiazaphosphaboretidinen 1a-i. Die Bildung von 1h, i wird von einem Austausch der N-ständigen Substituenten begleitet. 1H-, 11B-, 13C-, 29Si-, 31P-NMR- und Massenspektren werden diskutiert.
    Additional Material: 3 Tab.
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    URL: http://dx.doi.org/10.1002/cber.19891220511
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    Ein bequemer Weg von Alkenylboranen zu Alkenylstannanen (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 857-860 
    Details
    ISSN: 0009-2940
    Keywords: Alkenylboranes ; Alkenylstannanes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: A Convenient Route from Alkenylboranes to AlkenylstannanesAlkenyldialkylboranes 1 with various substituents at the C=C double bond, including organometallic groups such as the trimethylstannyl or trimethylsilyl group, react in hexane solution with (diethylamino)- or (dimethylamino)trimethylstannane (2) in the presence of a catalytic amount of lithium dimethyl- or diethylamide (3) to give aminodialkylboranes 4 and alkenyltrimethylstannanes 5 in high yields with retention of the configuration at the C—C double bond. With (diethylamino)trimethylplumbane (2c) the less stable alkenes 5Pb are obtained. A mechanism is proposed, and 1H-, 13C-, 29Si-, 119Sn- und 207Pb-NMR-data are reported.
    Notes: Alkenyldialkylborane 1 mit verschiedenen Substituenten an der C=C-Doppelbindung, einschließlich organometallischer Gruppen wie dem Trimethylstannyl- oder dem Trimethylsilyl-Rest, reagieren in Hexan mit (Diethylamino)- oder (Dimethylamino)trimethylstannan (2) in Gegenwart einer katalytischen Menge von Lithium-diethylamid (3b) oder -dimethylamid (3a) in hoher Ausbeute unter Beibehaltung der Konfiguration an der C—C-Doppelbindung zu den entsprechenden Alkenylstannanen 5 und Aminoboranen 4. Durch Einsatz von (Diethylamino)trimethylplumban (2c) lassen sich die weniger stabilen Alkene 5Pb erhalten. Ein Mechanismus wird vorgeschlagen, und 1H-, 13C-, 29Si-, 119Sn- und 207Pb-NMR-Daten werden mitgeteilt.
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    Wasserstoffübertragungen, 12: Ziegler-Nickel-Katalysatoren für den Wasserstoff-Transfer (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 1919-1924 
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    ISSN: 0009-2940
    Keywords: Hydrogen transfer ; Ziegler catalysis ; Dihydroarenes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Ziegler Nickel Catalysts for Hydrogen Transfer ReactionsCatalysts prepared from Ni(acac)2 and AlEt3 show high catalytic activity in the hydrogen transfer between dihydroarenes, but hardly any isomerisation and H/D scrambling is observed. The active form of the catalyst is produced only in the presence of the starting material. Kinetic experiments, especially those concerning the introduction periods and the inhibition, are indicative of a complex reaction mechanism. The first hydrogen is preferentially abstracted from the 2-position, the second with complete cis selectivity.
    Notes: Der aus Ni(acac)2 und AlEt3 dargestellte Katalysator zeigt eine hohe Aktivität beim H-Transfer zwischen Dihydroarenen, neben dem Isomerisierungen und H/D-Austausch kaum ablaufen. Die aktive Form entsteht erst in Gegenwart des Edukts. Kinetische Untersuchungen, vor allem zur Induktionsperiode und zur Hemmung, deuten auf einen komplexen Ablauf. Der Wasserstoff wird cis-selektiv abgespalten, primär bevorzugt aus der 2-Position.
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    Wasserstoffübertragungen, 13: (Distickstoff)hydridotris(triphenylphosphan)cobalt(I) als Disproportionierungs-Katalysator (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 1925-1927 
    Details
    ISSN: 0009-2940
    Keywords: Hydrogen transfer ; Olefin isomerization ; Cobalt complexes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Hydrogen Transfer Reactions, 13.  -  Catalysis of Disproportionation by (Dinitrogen)hydridotris(triphenylphosphine)cobalt(I)For both C—H activation and olefin isomerization, CoH(N2)(PPh3)3 (1) is a more powerful catalyst than the Wilkinson complex. In 1,2-dihydronaphthalene (2), a two-step cis abstraction of the hydrogen atoms is found with small regioselectivity in the first step.
    Notes: Die Aktivität des Komplexes CoH(N2)(PPh3)3 (1) liegt bei der C—H-Aktivierung deutlich höher als beim Wilkinson-Katalysator. Noch effektiver wird aber eine Olefin-Isomerisierung induziert. Die zweistufige H-Abstraktion erfolgt beim 1,2-Dihydronaphthalin (2) cis-selektiv, der Primärschritt aber kaum regioselektiv.
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    Synthesis and ring transformation of a new fused as-triazinium salt (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 1935-1938 
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    ISSN: 0009-2940
    Keywords: as-Triazinium salt, fused ; Ring transformation ; Solvatochromy, negative ; Zwitterion ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthese und Ringtransformation von neuen kondensierten as-Triazinium-SalzenDie Reaktion des 1,2-Diaminopyridinium-Salzes 1 mit dem Furandion 2 ergab ein Pyrido-as-triazinon 3, das zum tricyclischen Furo[2,3-e]pyrido[1,2-b]-as-triazinium-Salz 5 cyclisiert wurde. Die Reaktion von 5 mit Nucleophilen führte zu unterschiedlichen Produkten: mit wäßriger Base entstand das bicyclische Triazinon 4, mit dem Methoxid-Ion und sekundären Aminen wurden die stabilen Zwitter-Ionen 7a, b erhalten, wohingegen Ammoniak und Hydrazine unter Transformation des Furanringes die neuen tricyclischen kondensierten Pyrrole 10, 11 bzw. Pyridazine 13, 14a, b ergaben.
    Notes: The 1,2-Diaminopyridinium salt 1 was treated with furandione 2 to give pyrido-as-triazinone 3, which could be cyclized to the tricyclic furo[2,3-e]pyrido[1,2,-b]-as-triazinium salt 5. Reaction of 5 with nucleophiles resulted in different types of products. Thus, aqueous base afforded bicyclic triazinone 4, methoxide ion or secondary amine led to stable zwitterions 7a, b, whereas ammonia and hydrazines resulted in ring transformation of the furan moiety, and gave new fused tricyclic pyrroles (10, 11) and pyridazines (13, 14), respectively.
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    Enolether, XIX: Untersuchungen zur Autoxidation und zur Umlagerung von [n] (2,4) Phloroglucinophanen (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 1947-1953 
    Details
    ISSN: 0009-2940
    Keywords: Enol ethers ; [n](2,4)Phloroglucinophanes ; Autoxidation ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Investigations of the Autoxidation and the Rearrangement of [n](2,4)PhloroglucinophanesIn the autoxidation of [n](2,4)phloroglucinophanes 3 hydroperoxides 7 are isolated in several cases as the first oxidation products; they react to the more stable monohydroxylated compounds 8 with different rates. Acylphloroglucinophanes 5, however, react with oxygen to give the dihydroxylated compounds 9. The autoxidation rate of the phloroglucinophanes 3, 5 is markedly larger than that of diethylphloroglucinols 6. In alkaline solution the hydroxy compounds 8 rearrange to the dihydroxycyclopentenones 12; the rate of rearrangement correlates with the decrease of ring strain.
    Notes: Bei der Autoxidation von [n](2,4)Pholoroglucinophanen 3 können in einigen Fällen Hydroperoxide 7 als erste Oxidationsprodukte isoliert werden, die unterschiedlich rasch in die stabileren monohydroxylierten Verbindungen 8 übergehen. Aclphloroglucinophane 5 reagieren mit Luftsauerstoff dagegen zu den zweifach hydroxylierten Verbindungen 9. Die Geschwindigkeit der Autoxidation ist bei den Phloroglucinophanen 3, 5 deutlich größer als bei den 2,4-Diethylphloroglucinen 6. Im alkalischen Medium lagern sich die Hydroxyverbindungen 8 in die Dihydroxycyclopentenone 12 um, wobei für die Geschwindigkeit der Umlagerung eine Korrelation mit der Abnahme an Ringspannung gefunden wird.
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    Reaktionen ungesättigter Azide, 7: Basenkatalysierte Bildung von Allenylaziden aus Propargylaziden: Neue Synthesen für 1,2,3-Triazole (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 1963-1967 
    Details
    ISSN: 0009-2940
    Keywords: Allenyl azides, ring closure of ; Propargyl azides, rearrangement, base-induced ; Triazafulvenes, nucleophilic addition to ; 1,2,3-Triazoles, preparation of ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reactions of Unsaturated Azides, 7.  -  Base-catalyzed Formation of Allenyl Azides from Propargyl Azides: New Syntheses for 1,2,3-TriazolesThe propargyl azides 10, 14, 17, 20, and 28 undergo a base-catalyzed (prototropic) rearrangement to short-lived allenyl azides. These intermediates rapidly cyclize to triazafulvenes, which can be trapped by nucleophiles (methanol, sodium hydroxide, ammonia) to give 1,2,3-triazoles. Starting with the precursors 9, 13, 16, 19, and 27 one-pot syntheses lead to the heterocycles 12, 15, 18, 21, and 29. Depending on the reaction conditions, compound 10 regioselectively yields 12c (75%) by prototropic rearrangement (path B) or by migration of the azide group (path A) the isomer 11c (62%).
    Notes: Die Propargylazide 10, 14, 17, 20 und 28 lagern sich basenkatalysiert (prototrop) zu kurzlebigen Allenylaziden um. Diese Zwischenstufen cyclisieren rasch zu Triazafulvenen, die mit Nucleophilen (Methanol, Natriumhydroxid, Ammoniak) als 1,2,3-Triazole abgefangen werden können. Ausgehend von den Vorläufern 9, 13, 16, 19 und 27 führen Eintopf-Synthesen zu den Heterocyclen 12, 15, 18, 21 und 29. In Abhängigkeit von den Reaktionsbedingungen liefert 10 über die prototrope Umlagerung (Weg B) regioselektiv 12c (75%) oder durch Azidwanderung (Weg A) die isomere Verbindung 11c (62%).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19891221022
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    Reductive lithiation of sulfides and sulfones  -  A novel entry into [2,3] wittig rearrangements (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 2023-2025 
    Details
    ISSN: 0009-2940
    Keywords: Homoallylic alcohols ; [2,3] Sigmatropic rearrangement ; Stereoselective synthesis of alcohols ; [2,3] Wittig rearrangement ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The reductive cleavages of allyl [(phenylthio)methyl] ethers (8, 11) and an allyl [(tolylsulfonyl)methyl] ether (14) with lithium naphthalenide in THF furnish homoallylic alcohols (9, 12). The steric course of these transformations (E/Z selectivity in the case of 9, syn/anti selectivity for 12) is very similar to that of analogous Wittig-Still rearrangements.
    Additional Material: 1 Tab.
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    URL: http://dx.doi.org/10.1002/cber.19891221033
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    Addition von metalloganischen Nucleophilen an Koordinierte 1,3-Diene, Trimethylenmethan und Cycloheptatrienyl: Heterobimetallische carbonyl Molybdän-Rhenium-Komplexe mit σ,π-C4- und-C7-Kohlenwasserstoffbrücken (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 2031-2031 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19891221035
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    Pentaphosphaferrocene als Komplexliganden (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 2049-2054 
    Details
    ISSN: 0009-2940
    Keywords: Ligating properties ; Pentaphosphaferrocenes ; Sandwich and triple-decker complexes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Pentaphospaferrocenes as Complex LigandsThe interaction of [Cp*Fe(P5)] (1a) with [Cr(CO)5(thf)] and [Cp(CO)2Mn(thf)], respectively, affords [Cp*Fe(P5){Cr(CO)5}2] (2) as well as [Cp*Fe(P5){Mn(CO)2Cp}n] (4a-d; n = 1-4; Cp* = η5-C5Me5). Irradiation of 1 and [CpFe(C6H6)]PF6 gives the cationic 30-VE triple-decker complexes [CpFe(μ, η5-P5)Fe(C5Me4R)]PF6 (3a: R = CH3; 3b: R = C2H5; Cp = η5-C5H5). In addition to the NMR studies 2 and 3b have been characterized by X-ray structure analyses.
    Notes: Die Umsetzung von [Cp*Fe(P5)] (1a) mit [Cr(CO)5(THF)] bzw. [Cp(CO)2Mn(THF)] ergibt [Cp*Fe(P5){Cr(CO)5}2] (2) sowie [HCp*Fe(P5){Mn(CO)2Cp}n] (4a-d; 1-4; Cp* = η5-C5Me5). Aus 1 und [CpFe(C6H6)]PF6 lassen sich photochemisch die kationischen 30-VE-Tripeldeckerkomplexe [CpFe(μ, η5-P5)Fe(C5Me4R)]PF6 (3a: R = CH3; 3b: R = C2H5; Cp = η5-C5H5) aufbauen. Zusätzlich zu den NMR-spektroskopischen Studien wurden von 2 und 3b Kristallstrukturanalysen angefertigt.
    Additional Material: 3 Ill.
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    Masthead (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989) 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19891221101
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    Organische Synthesen mit Übergangsmetallkomplexen, 35. (C-Amino)ketenimine, 2-Imidazolin-5-one und α-Aminosäureamide aus (Aminocarben)chromkomplexen und Isocyaniden (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 1139-1145 
    Details
    ISSN: 0009-2940
    Keywords: C-(Alkylideneamino)ketene imines ; Isocyanides, C=C coupling with aminocarbene ligands ; (2-Azaallenyl)chromium complexes ; 2-Imidazolin-5-ones ; α-Amino acids ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Organic Syntheses via Transition Metal Complexes, 35. - (C-Amino) Ketene Imines, 2-Imidazolin-5-ones, and α-Amino Acids from Aminocarbene Chromium Complexes and IsocyanidesC-(Alkylidenamino)ketene imines 1,4-diaza-1,2,4-pentatrienes) 8 are easily accessible by C=C coupling of isocyanides R1 - NC (2, R1 = t-C4H9, c-C5H11, CH3) with the (alkylideneamino)carbene (= 2-azaallenyl-) ligand of (6). The tendency for an insertion of 2 into M=C bonds of aminocarbene complexes strongly depends on the electronic character of the aminocarbene ligand. Electron-rich aminocarbene chromium complexes like (CO)5Cr=C(NR2)C6H5 (1, R = H, CH3), show only little tendency for an insertion but mainly give cis-(R1-NC)(CO)4Cr=C(NR2C6H5 (3) by substitution of CO. Electron-poor aminocarbene complexes like 6 (readily available on N-benzoylation of 1a) undergo a facile insertion of 2 into the M=C bond with smooth formation of 7. From 7 ketene imine 8 is spontaneously disengaged by a second equivalent of 2. The reaction works especially well with bulky isocyanides 2a, b. In the case of methyl isocyanide (2c) a [bis(imino)dihydropyrrol]chromium complex 15 is obtained as a minor product besides 8c. 15 results from a [4+1] cycloaddition of 2c at the ketene imine ligand of 7c. C-(Alkylideneamino)ketene imines 8 are easily accessible by our method. They prove to be very thermolabile in solution and spontaneously isomerize to give 2-imidazolin-5-ones 10 and C-amidoketene imines 11. Under the influence of wet silica gel keten imine derivatives 8 rapidly form α-amino acid amides 16 by hydrolysis with concomitant migration of a benzoyl group. Under the same conditions 11 also gives the „normal“ α-amino acid amides 17.
    Notes: C-(Alkylideneamino)ketenimine (1,4-Diaza-1,2,4-pentatriene) 8 wurden durch C=C-Kupplung von Isocyaniden R1-NC (2, R1 = t-C4H9, c-C5H11, CH3) mit dem (Alkylideneamino)carben-(= 2-Azaallenyl-)Ligand von (6) erstmals hergestellt. Die Bereitschaft zur Insertion von 2 in M=C-Bindungen von Aminocarbenkomplexen hängt stark von den elektronischen Eigenschaften der Aminocarbenliganden ab. Elektronenreiche (Aminocarben)chromkomplexe, wie z. B. (CO)5Cr=C(NR2)C6H5 (1, R = H, CH3), zeigen eine nur geringe Neigung zur Insertion von 2 und bilden bevorzugt cis-(R1-NC)(CO)4Cr=C(NR2C6H5 (3) unter Substitution von CO. Elektronenarme (Aminocarben)chromkomplexe hingegen, wie z. B. 6 (durch N-Benzoylierung von 1a leicht zugänglich), zeigen ausschließlich Insertion zu 7. Aus 7 wird spontan 8 freigesetzt durch Substitution mit einem zweiten Äquivalent 2. Sperrige Isocyanide 2a, c reagieren besonders einheitlich. Mit Methylisocyanid (2c) entsteht zusätzlich zu 8c der [Bis(imino)dihydropyrrol]-chromkomplex 15 unter [4+1]-Cycloaddition von 2c am Keteniminligand von 7c. C-(Alkylidenamino)ketenimine 8 sind nach unserem Verfahren einfach zugänglich; sie isomerisieren jedoch leicht zu 2-Imidazolin-5-onen 10 und C-Amidoketeniminen 11. An feuchtem Kieselgel entstehen aus 8 rasch α-Aminosäureamide 16 durch Hydrolyse unter Wanderung eines Benzoylrestes; aus 11 unter gleichen Bedingungen zusätzlich „normale“ α-Aminosäureamide 17.
    Type of Medium: Electronic Resource
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    Donorsubstituierte Benzonitrile als Seitenkettendienophile bei der intramolekularen [4 + 2]-Cycloaddition mit inversem Elektronenbedarf (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 2177-2181 
    Details
    ISSN: 0009-2940
    Keywords: Benzonitriles ; Hetero Diels-Alder reactions, “inverse” ; Pyrazines, annulated ; Triazines, benzofuro- and benzothieno- ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Donor-Substituted Benzoitriles as Side-Chain Dienophiles in the Intramolecular [4+2] Cycloaddition with Inverse Electron DemandExpanding the scope of the intramolecular Diels-Alder reaction of 1,2,4,5-tetrazines to include donor-substituted benzonitriles as side-chain dienophiles we describe synthetic routes to novel fused heterotricycles such as the benzofuro[3,2-e]-1,2,4-triazines 11a, b and the benzothieno[3,2-e]-1,2,4-triazines 14a, b, and 17. The doubly annulated pyrazines 22 and 23 are constructed by a subsequent second intramolecular Diels-Alder cycloaddition of the benzonitrile moiety with the fused 1,2,4-triazine system, starting from 11a and 14a.
    Notes: Unter Einschluß donorsubstituierter Benzonitrile als Seitenkettendienophile haben wir die Anwendungsbreite der intramolekularen Diels-Alder-Reaktion von 1,2,4,5-Tetrazinen erweitert und beschreiben Synthesewege zu neuen anellierten Heterotricyclen wie den Benzofuro[3,2-e]-1,2,4-triazinen 11a, b und den Benzothieno[3,2-e]-1,2,4-triazinen 14a, b sowie 17. Die doppelt anellierten Pyrazine 22 und 23 lassen sich durch eine nachfolgende zweite intramolekulare Benzonitril/1,2,4-Triazin-Diels-Alder-Cycloaddition mit 11a bzw. 14a als Edukten herstellen.
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    URL: http://dx.doi.org/10.1002/cber.19891221119
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    Intramolekulare Cycloadditionen mit Nitriloxiden: Untersuchungen zur Synthese von Heterophanen (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 2147-2157 
    Details
    ISSN: 0009-2940
    Keywords: 1,3-Dipolar cycloadditions, intramolecular ; Nitrile oxides ; Regioselectivity ; Furanophanes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Intramolecular Cycloadditions with Nitrile Oxides: Investigtions towards the Synthesis of HeterophanesThe intramolecular cycloaddition reactions of the nitrile oxides 30a-d, 35, 36, and 47, obtained in situ from the 2,5-difunctional furan hydroximoyl chlorides 12a, b, 18 and the nitro compounds 9c, d, 21, 29, are described. With 30c the expected isoxazolofuranophane of type 31 is formed in acceptable yield; the additionally formed regioisomer 32c and the dimer 34c are very minor products in this case. Whereas the highest homologue 30d gives a complex product mixture with small amounts of 31 d and the macrocycle 34d as the only identified compounds, the derivatives bearing a shorter side chain (30a, b; n = 1, 2) give rise to the exclusive reaction of the dipole with a double bond of the furan system (to give 33a, b). The same behavior is observed in the case of the electronically and sterically modified dipole systems 35/36 and 47, resp.; in spite of the much more favorable conditions for the formation of cyclophanes the cycloadditions result in the exclusive formation of the heterotricycles 41, 42 and 49. Possible preparative applications of the isomeric cycloaddition compounds are discussed.
    Notes: Die intramolekularen Cycloadditionsreaktionen der aus 2,5-difunktionellen Furan-Hydroximsäurechloriden (12a, b und 18) bzw. den Nitroverbindungen 9c, d, 21 und 29 in situ hergestellten Nitriloxide 30a-d, 35, 36 und 47 werden beschrieben. Eine Reaktion zu den angestrebten Isoxazolo-furanophanen des Typs 31 verläuft für 30c in brauchbarer Ausbeute; das Regioisomere 32c sowie das Dimere 34c treten hierbei nur in geringem Maße auf. Während das höchste Homologe 30d neben 31d und dem Makrocyclus 34d hauptsächlich Zersetzungsprodukte bildet, reagieren die Derivate mit kürzerer Seitenkette (30a, b; n = 1, 2) ausschließlich unter dipolarer Addition an eine Furandoppelbindung zu 33a, b. Für n = 1 entsprechen diesem Verhalten auch die elektronisch bzw. sterisch modifizierten Dipolsysteme 35/36 und 47, die trotz günstigerer Voraussetzungen für die Cyclophanbildung nur zu den Tricyclen 41, 42 bzw. 49 reagieren. Die präparativen Anwendungsmöglichkeiten der isomeren Cycloadditionsverbindungen als Synthesezwischenprodukte werden diskutiert.
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    Synthesis of 3,5-dihydroxytropone (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 2183-2185 
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    ISSN: 0009-2940
    Keywords: [4 + 2] Cycloaddition ; 3,5-Dihydroxytropone ; Singlet oxygen ; Y aromaticity ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthese von 3,5-DihydroxytroponWir beschreiben eine vierstufige Synthese des bisher unbekannten 3,5-Dihydroxytropons (6), die von Tropon ausgeht und eine [4 + 2]-Cycloaddition mit Singulett-Sauerstoff einschließt.
    Notes: Starting from tropone, the hitherto unknown 3,5-dihydroxytropone (6) is prepared in a four-step synthesis including a [4 + 2] cycloaddition reaction of singlet oxygen.
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    URL: http://dx.doi.org/10.1002/cber.19891221120
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    Hetero diels-alder reactions of allenes on silica gel surface and under liquid-phase conditions (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 2207-2208 
    Details
    ISSN: 0009-2940
    Keywords: Allenes ; Hetero Diels-Alder reactions ; Catalysis, heterogeneous ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Some examples of cycloadditions of 1-ethoxy-1,2-propadiene with 1-oxa-1,3-dienes, catalyzed by acid-free silica gel, are reported.
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    Masthead (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989) 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19891221201
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    Metal complexes with tetrapyrrole ligands, LIV: Synthesis, spectra, structure, and redox properties of cerium(IV) Bisporphyrinates with identical and different porphyrin rings in the sandwich system (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 2219-2228 
    Details
    ISSN: 0009-2940
    Keywords: Bisporphyrinates, cerium(IV) ; Lanthanoid porphyrins ; Metalloporphyrins ; Tetrapyrrole complexes, sandwich-like ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Metallkomplexe mit Tetrapyrrol-Liganden, LIV.  -  Synthese, Spektren, Struktur und Redox-Chemie von Cer(VI)-Bisporphyrinaten mit gleichen und verschiedenen Porphyrin-Ringen im Sandwich-SystemWeitere symmetrische Cer(IV)-Bisporphyrinate werden aus Cer-(III)-acetylacetonat und Tetraphenylporphyrin, Tetra-p-chlorphenylporphyrin, und Hexadecahydrotetrabenzporphyrin hergestellt. Aus dem letzteren Porphyrin entsteht auch ein Biscer(III)-Tripeldecker; ein solcher bildet sich als einziges Produkt aus Octamethylporphyrin. Aus einem Gemisch zweier verschiedener Porphyrine, nämlich Octaethylporphyrin [H2(OEP)], und Tetraphenyl-porphyrin [H2(TPP)] oder Tetra-p-chlorphenylporphyrin [H2-(TClP)] erhält man neben den symmetrischen Spezies Ce(OEP)2 und Ce(TPP)2 die unsymmetrischen („gemischten“) Doppeldecker Ce(OEP)(TPP) oder Ce(OEP)(TClP), die verschiedene Porphyrin-Ringe im Sandwich-System haben und sich trennen lassen. Die Kristallstrukturanalyse von Ce(OEP)(TPP) zeigt CeIV in quadratisch-antiprismatischer Umgebung der Pyrrol-N-Atome der Porphyrin-Ringe. Während die IR- und NMR-Spektren der unsymmetrischen Doppeldecker-Überlagerungen der Spektren, die einzelnen Ringe darstellen, zeigen ihre UV/VIS-Spektren und die cyclischen Voltammogramme, daß die zwei unterschiedlichen Porphyrin-Ringe sich wie ein gemeinsames π-Elektronensystem verhalten. Die Darstellung der π-Kation-Radikal-Salze [Ce(OEP)2]-ClO4 und [Ce(OEP)(TPP)]SbCl6 wird ebenfalls beschrieben. In letzterem scheint sich das Defektelektron bevorzugt im OEP-Ring aufzuhalten.
    Notes: Further symmetrical cerium(IV) bisporphyrinates are prepared from cerium(III) acetylacetonate and tetraphenylporphyrin, tetra-p-chlorophenylporphyrin, and hexadecahydrotetrabenzporphyrin. In the latter case, a biscerium(III) triple-decker is also found which is the only product in the case of octamethylporphyrin. From a mixture of two different porphyrins, namely octaethylporphyrin [H2(OEP)] and either tetraphenylporphyrin [H2(TPP)] or tetra-p-chlorophenylporphyrin [H2(TClP)], besides the symmetrical species Ce(OEP)2 and Ce(TPP)2, the unsymmetrical (“mixed”) double-deckers Ce(OEP)(TPP) or Ce(OEP)(TClP) are obtained which have different porphyrin rings in the sandwich system and can be separated by chromatography. The crystal structure analysis of Ce(OEP)(TPP) shows CeIV in a square-antiprismatic geometry of the pyrrole N atoms of the porphyrin rings. While the IR and NMR spectra of the unsymmetrical double-deckers are superpositions of the spectra of the individual rings, their UV/VIS spectra and cyclic voltammograms indicate that the two porphyrin rings behave as a common π-electron system. The preparation of the π-cation radical salts [Ce(OEP)2]ClO4 and [Ce(OEP)(TPP)]SbCl6 is also described. In the latter, the defect electron seems to reside preferentially in the OEP ring.
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    Aufbau von Fe—Sn-Bindungen über die Reaktion von Tris(trimethylstannyl)amin mit Fe(CO)5 und Fe(CO)4CS; 13C-, 17O- und 119Sn-NMR-spektroskopische Untersuchungen (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 2261-2264 
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    ISSN: 0009-2940
    Keywords: Iron, thiocarbonyl complex ; Iron-tin bond ; NMR, 13C-, 17O-, and 119Sn ; Dynamic molecules ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Formation of Fe-Sn Bonds by the Reaction of Tris(trimethylstannyl)amine with Fe(CO)5 and Fe(CO)4CS; 13C-, 17O-, and 119Sn-NMR-Spectroscopic StudiesThe reaction between N(SnMe3)3 and Fe(CO)5 gives the known complex cis-Fe(CO)4(SnMe3)2 (1) in high yield. In the analogous reaction of Fe(CO)4CS the complex fac-Fe(CO)3(CS)(SnMe3)2 (2) is obtained together with small amounts of 1. In addition to the 13C-NMR data, the 17O- and 119Sn-NMR measurements proved particularly useful for studying the dynamic behaviour of 1 and 2.
    Additional Material: 3 Ill.
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    URL: http://dx.doi.org/10.1002/cber.19891221208
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    Dichlorobis(η5-cyclopentadienyl)rhenium(VII)-tris(hexafluoroantimonat): Synthese des ersten Rhenocen(VII)-dichlorid-Kations (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 2273-2274 
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    ISSN: 0009-2940
    Keywords: Fluorine, application in organometallic chemistry ; Rhenocene(V)-trichloride ; Rhenocene(VII)-dichloride trication ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Dichlorobis(η5-cyclopentadienyl)rhenium(VII) Tris(hexafluoroantimonate): Synthesis of the First Rhenocene(VII) Dichloride CationRhenocene trichloride ([Cp2ReCl2]⊕ Cl⊖, 1) reacts with one equivalent of AgSbF6 and three equivalents of SbF5 to provide [Cp2ReCl2]3⊕[SbF6]⊖3 (2) in high yield. 2 contains the first rhenocene(VII) dichloride cation and is the first member of a 16-electron group-7 species of the type [Cp2MCl2]n⊕ [EF6]n⊖ (M = Ti, Zr, Hf: n = 0; M = V, Nb: n = 1; M = Mo, W: n = 2; M = Re: n = 3; E = As, Sb).
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    URL: http://dx.doi.org/10.1002/cber.19891221211
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    Darstellung und Eigenschaften von und Reaktionen mit metallhaltigen Heterocyclen, LXVII: Stereochemische Einflüsse auf den Übergang von monomeren Thiophosphinitomangan-Verbindungen zu den dimeren Komplexen (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 2269-2271 
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    ISSN: 0009-2940
    Keywords: Manganese complexes ; Thiophosphinito complexes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Metal-Containing Heterocycles: Preparation, Properties, Reactions, LXVII.  -  Stereochemical Impacts on the Transition of Monomeric Thiophosphinito Manganese Compounds to the Dimeric Complexes The η2-thiophosphinito manganese complexes (3d, e) and the dimeric complexes (4a-c, f) are obtained from BrMn(CO)5 (1) and the secondary phosphane sulfides R2P(S)H (2a-f) [R = Me (a), Et (b), n-Pr (c), i-Pr (d), Cy (e), Ph (f)] in the presence of the auxiliary base Et(i-Pr)2N with elimination of CO. For the kinetic stabilization of 3d, e sterically demanding substituents R at the phosphorus are suitable. The Mn—S bond in 3e is easily cleaved under CO pressure (100 bar) resulting in the formation of (5e). The reaction 3e ⇆ 5e is reversible.
    Additional Material: 1 Tab.
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    Synthese und Eigenschaften von iPr2InCl, iPrInCl2 und (iPr2InNHtBu)2 (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 2283-2287 
    Details
    ISSN: 0009-2940
    Keywords: Indium, trialkyl derivatives ; Dialkylchloroindium ; Alkyldichloroindium ; Alkylindium dialkylamides ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Synthesis and Properties of iPr2InCl, iPrInCl2, and (iPr2InHRtBu)2The reactions of triisopropylindium (1) with half an equivalent or two equivalents of indium (III) chloride leads to iPr2InCl (2) and iPrInCl2 (3), respectively. (iPr2InNHtBu)2 (4) can be synthesized from 2 and LiNHtBu. According to NMR, IR, and RE studies, 2-4 from dimers in solution and solid state. The X-ray analysis of 4 is reported.
    Additional Material: 2 Ill.
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    URL: http://dx.doi.org/10.1002/cber.19891221214
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    Propiniminium-Salze: Ambifunktionelle Reaktivität gegenüber S- und N-Nucleophilen (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 2311-2317 
    Details
    ISSN: 0009-2940
    Keywords: Allenes, 1,3-diamino- and 1-amino-3-thio- ; Propene iminium salts ; Propyne iminium salts ; MO calculations ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Propyne Iminium Salts: Ambifunctional reactivity reactivity towards Sulfur and Nitrogen NucleophilesPropyne iminium ions 2a-d have been studied by both ab initio (3-21G//3-21G for 2a) and MNDO calculations (2a-d). It is found that the amino group stabilizes the propargyl cation structure at the expense of the allenyl cation structure. Furthermore, the highest positive charge density is located at the amino-substituted carbon atom.  -  Reactions of 2-propyne iminium triflates 6a, b with thiols, thiolates, morpholine, lithium morpholide, and phenylhydrazine have been investigated. C-1 attack at 6, expected under kinetically controlled conditions, is observed in a few cases only. In all other cases, products resulting from C-3 attack takes place leading either to 1,3-donorsubstituted allenes (8, 10, 12) in the absence of proton sources or to their C-2-protonated forms (9, 11, 13-15) otherwise.
    Notes: Für die Propiniminium-Ionen 2a-d werden ab-initio- (3-21G//3-21G für 2a) und MNDO-Rechnungen (2a-d) durchgeführt. Danach stabilisiert die Aminogruppe die Propargylkation- eindeutig gegenüber der Allenylkation-Struktur. Die höchste positive Ladungsdichte befindet sich am aminosubstituierten Kohlenstoffatom.  -  Umsetzungen der 2-Propiniminium-triflate 6a, b mit Thiolen, Thiolaten, Morpholin, Lithium-morpholid und Phenylhydrazin zeigen, daß nur in einigen Fällen unter kinetisch kontrollierten Bedingungen der erwartete C-1-Angriff erfolgt, ansonsten wird C-3-Angriff gefunden. Letzterer führt in Abwesenheit von Protonquellen zu 1,3-donorsubstituierten Allenen (8, 10, 12), andernfalls entstehen deren C-2-protonierte Formen (9, 11, 13-15).
    Additional Material: 3 Tab.
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    URL: http://dx.doi.org/10.1002/cber.19891221218
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    Cycloadditionen, 17: Einfluß von Methyl- und Phenylgruppen in der allenischen ω-Position auf die thermisch induzierten Isomerisierungen von N-[2-Furanyl-(Thienyl-, Pyrrolyl-)-methyl]allencarboxamiden (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 2331-2339 
    Details
    ISSN: 0009-2940
    Keywords: Diels-Alder reactions, intramolecular ; Allenecarboxyamides, N-(hetarylmethyl)- ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Cycloadditons, 17.  -  Influence of Methyl and Phenyl Groups in the Allenic ω-Position on the Thermally Induced Isomerizations of N-[2-Furanyl-(Thienyl-, Pyrrolyl-)methyl] allenecaboxamindesThe N-(2-hetarylmethyl)-1,2-alkadienecarboxamides 9a-q were synthesized by the ylide route, and their readiness to participate in the intramolecular Diels-Alder reaction was studied. Whereas the pyrrole derivatives 9p and 9q and the thiophene derivative 9o without directly bonded phenyl nuclei only decompose, the thiophene allenes 9m and 9n form the “normal” tricycles 12a and 12b by reaction of their amide phenyl nucleus (R1 = Ph). In all N-furfurylallenecarboxamides 9a-1 the furan nucleus is involved in the intramolecular Diels-Alder reaction, irrespective of the amine substituent R1. The furan nucleus reacts in all cases with the terminal allenic double bond to form the oxatricycles 10a-1 containing a six-membered lactam moiety. Reaction with the first allenic double bond (formation of 11c, d, and g) only takes place, when the reaction with the other double bond is slowed down by one or two methyl groups in the ω-position and the formation of 11 is not prevented by a methyl group in the furan 5-position.
    Notes: Die N-(2-Heteroarylmethyl)-1,2-alkadiencarboxamide 9a-q werden auf dem Ylid-Weg synthetisiert und auf ihre Bereitschaft zur intramolekularen Diels-Alder-Reaktion untersucht. Die Pyrrolderivate 9p und 9q und das Thiophen-Derivat 9o ohne direkt gebundenen Phenylkern zeigen lediglich Zersetzung, während die Thiophen-Allene 9m und 9n durch Reaktion ihrer Amid-Phenylkerne (R1 = Ph) die „normalen“ Tricyclen 12a und 12b bilden. In allen Furfuryl-allencarboxamiden (9a-1) geht der Furankern die intramolekulare Diels-Alder-Reaktion ein, unabhängig von der Art des Aminsubstituenten R1. Der Furankern reagiert in allen Fällen mit der endständigen Doppelbindung zu den Oxatricyclen 10a-1 mit sechsgliedrigem Lactamteil. Reaktion mit der ersten allenischen Doppelbindung (s. Bildung von 11c,d und g) wird daneben nur beobachtet, wenn durch Einbau von Methyl-gruppen in die ω-Position die Reaktion mit der endständigen Doppelbindung stark verlangsamt und die Bildung von 11 nicht durch eine Methylgruppe in der Furan-5-Position verhindert wird.
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    Cycloadditionen an die Doppelbindung von (R)-2-tert-Butyl-Δ4-1,3-oxazolin-3-carbonsäure-methylestern (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 2377-2389 
    Details
    ISSN: 0009-2940
    Keywords: EPC syntheses ; Δ4-1,3-Oxazoline, derivatives ; Simmons-Smith reaction ; Sakurai reaction ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Cycloadditions to the Double Bond of Methyl (R)-2-tert-Butyl-Δs4-1,3-oxazoline-3-carboxylates1The title compounds (with or without an additional substituent, such as methyl or vinyl, in the 5-position) are allowed to react with peracids (→ dihydroxy derivatives 3), with cyclopropanation reagents (such as ICH2ZnEt, N2CHCOOEt, HCBr3, or HCCl3/NaOH → products 5-9), with tetracyanoethylene and OsO4 (see four- and five-membered rings in 19, 20), with dienophiles (maleic anhydride, see 23). The double bond of the oxazolines reacts in a highly diastereoselective manner, with the attack preferred from the face of the five-membered ring remote from the tert-butyl group. Some of the products obtained undergo or are subjected to further reactions (4, 12-18, 23, 29-33). Stereochemical and synthetic aspects of the reactions are discussed.
    Notes: Die Titelverbindungen (mit und ohne zusätzliche Substituenten wie z. B. Methyl oder Vinyl in der 5-Stellung) werden mit Persäuren (→ Dihydroxyderivate 3), mit Cyclopropanierungsreagentien (wie z.B. ICH2ZnEt, N2CHCOOEt, HCBr3 oder HCCl3/NaOH → Produkte 5-9), mit Tetracyanethylen und OsO4 (→ Produkte 19-20) und mit Dienophilen (Maleinsäureanhydrid, siehe 23) umgesetzt. Die Doppelbindung der Oxazoline reagiert hoch diastereoselektiv, wobei der bevorzugte Angriff von der der tert-Butylgruppe abgewandten Seite erfolgt. Einige der erhaltenen Produkte werden weiter umgesetzt (siehe 4, 12-18, 23, 29-33). Stereochemische und synthetische Aspekte der Reaktionen werden diskutiert.
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    Reaktionen mit Aziridinen, 52: Tryptamin-Verbindungen mit Seitenkettensubstitution aus Indolyllithium und aktivierten Aziridinen (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 2397-2398 
    Details
    ISSN: 0009-2940
    Keywords: Nucleophilic ring opening ; Regioselectivity ; Ambident nucleophiles ; Aziridines ; Tryptamine ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Reactions with Aziridines, 52.  -  branched-Chain Tryptamine Compounds from Indolyllithium and Activated AziridinesReaction of indolyllithium 1 with activated aziridines 2 in toluene provides the tryptamines 3 or 4 in good yields.
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    Regioselective cycloaddition of 1,2-disubstituted aziridines to heterocumulenes catalyzed by organoantimony halides (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 2407-2409 
    Details
    ISSN: 0009-2940
    Keywords: Organoantimony halides ; Aziridines, cycloaddition of, α-cleavage of ; Heterocumulenes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: In the presence of catalytic amounts of organoantimony(V) halides such as Ph4SbI, Ph4SbBr, Ph3SbBr2, and Ph3SbCl2, the cycloaddition of aziridines 1a-g with heterocumulenes (phenyl isothiocyanate, carbon disulfide, and carbon dioxide) selectively gave ring-expanded cycloadducts 3a-d, f, g, and 6e by α-cleavage of the aziridine rings.
    Additional Material: 2 Tab.
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    URL: http://dx.doi.org/10.1002/cber.19891221232
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    Rotationsbarrieren gespannter Olefine (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 1263-1275 
    Details
    ISSN: 0009-2940
    Keywords: Rotational barriers ; Olefins, strained ; Heat of hydrogenation ; Force-field calculation ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Rotational Barriers of Strained OlefinesFor the olefins 1-8 heats of formation have been derived from heats of hydrogenation and force-field calculations, respectively. From the kinetics of their geometrical isomerisation the corresponding values for the transition states were obtained. The rotational barriers, which vary by nearly 30 kcal/mol, can be described by a unique torsional potential (65.9 ± 0.9 kcal/mol), which is independent of the degree of substitution, if a correction is made for the steric energy contribution in the ground- and transition-states.
    Notes: Für die Olefine 1-8 wurde durch Hydrierwärme-Messung bzw. Kraftfeld-Rechnung die Bildungsenthalpie der Grundzustände und durch kinetische Analyse der geometrischen Isomerisierung die der Übergangszustände ermittelt. Die um fast 30 kcal/mol variierenden Rotationsenthalpien lassen sich mit einer einheitlichen, vom Substitutionsgrad unabhängigen Torsionsbarriere (65.9 ± 0.9 kcal/mol) beschreiben, wenn um die sterischen Energiebeiträge der Grund- und Übergangszustand korrigiert wird.
    Additional Material: 5 Ill.
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    URL: http://dx.doi.org/10.1002/cber.19891220710
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    [4+2]-Cycloadditionen von 2-Cyclopropyliden-1,3-dionen mit elektronenreichen Alkinen (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 1285-1290 
    Details
    ISSN: 0009-2940
    Keywords: 2-Cyclopropylidene-1,3-diones ; Hetero Diels-Alder reaction ; Cyclopropane derivatives ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: [4+2] Cycloaddition reactions of 2-Cyclopropylidene-1,3-diones with Electron-Rich AlkynesCyclopropylidenedimedone 3, an unstable and highly reactive intermediate, is trapped in a Hetero Diels-Alder reaction by the addition of ynamines 7a-c, f, ynether 7d, or phenylacetylene (7e). Hydrolysis of the resulting cycloadducts 8a-d, f leads to carboxylic acid derivatives 9a-d, f. The latter may be regarded as the result of a twofold nucleophilic substitution at a cyclopropane system according to their synthesis by the sequence 17 → 5 → 8 → 9. An opening of the cyclopropane ring takes place during hydrolysis of cycloadduct 8e producing 11. Analogously, 2-cyclopropylidene-1,3-diones 13A-13C can be generated by aminocyclopropylation of CH acids 18A-18C and subsequent deamination induced by an acylation reaction. Trapping of 13A-13C by ethoxyacetylene (7d) or ethyl vinyl ether (4) provides the analogous cycloadducts 14A, B and 15C.
    Notes: Cyclopropylidendimedon 3, eine unbeständige und hochreaktive Zwischenstufe, kann durch Inamine 7a-c, f, Inether 7d oder Phenylacetylen (7e) in einer Hetero-Diels-Alder-Reaktion abgefangen werden. Die resultierenden Cycloaddukte 8a-d, f sind zu Carbonsäurederivaten 9a-d, f hydrolysierbar, die entsprechend ihrer Herstellung über die Reaktionssequenz 17 → 5 → 8 → 9 als Produkte einer zweifachen nucleophilen Substitution am Cyclopropan anzusehen sind. Das Cycloaddukt 8e läßt sich dagegen nur unter Öffnung des Dreirings zu 11 hydrolysieren. Analog können die 2-Cyclopropyliden-1,3-dione 13A-13C durch Aminocyclopropylierung von CH-Säuren 18A-18C und anschließende Desaminierung erzeugt und unter Zusatz von Ethoxyacetylen (7d) oder Ethylvinylether (4) zu den Cycloaddukten 14A, 14B und 15C abgefangen werden.
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    URL: http://dx.doi.org/10.1002/cber.19891220712
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    Diels-Alder-Reaktionen mit Diakzeptor-substituierten Methylencyclopropanen  -  Ein neuer Aspekt für die doppelte nucleophile Substitution an Cyclopropanen (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 1277-1284 
    Details
    ISSN: 0009-2940
    Keywords: Diels-Alder reaction ; Cyclopropanes ; Dienophile reactivity ; MNDO calculations ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Diels-Alder Reactions with Diacceptor-Substituted Methylene-cyclopropanes - A New Aspect for the Twofold Nucleophilic Substitution at Cyclopropanes(Diacylmethylene)cyclopropanes 3, generated from aminocyclopropanes 1 or 2 and acetyl chloride as highly reactive intermediates, are trapped by dienes 9a-c yielding the Diels-Alder products 10. Regioisomers 10Ab and 10Ac were isolated exclusively from the interaction of 1A with pentadiene 9b and isoprene (9c), respectively. Cycloadditions with bicyclic methylenecyclopropanes 3A and 3B stereospecifically generated the 1α,6α,7β-isomers 10A and 10B. Starting from 10 the products 16, 19, and 20 are obtained by a degradation reaction of the Meldrum's acid moiety or by an oxidative ring cleavage of the cyclohexene unit. An X-ray structural analysis is reported for 10Ac. Using MNDO calculations the reactivity of various (diacylmethylene)cyclopropanes 3 as dienophiles has been studied.
    Notes: (Diacylmethylen)cyclopropane 3, die als hochreaktive Zwischenstufen aus den Aminocyclopropanderivaten 1 bzw. 2 in Gegenwart von Acetylchlorid erzeugt werden, reagieren mit Dienen 9a-c zu Diels-Alder-Produkten 10. Aus der Umsetzung von 1A mit Pentadien 9b bzw. Isopren (9c) werden ausschließlich die Regioisomeren 10Ab und 10Ac isoliert. Die Cycloadditionen an die bicyclischen Methylencyclopropane 3A und 3B verlaufen stereospezifisch zu 1α,6α,7β-Isomeren 10A und 10B. Aus 10 lassen sich durch Abbau der Meldrumsäure bzw. durch oxidative Ringöffnung des Cyclohexens die Folgeprodukte 16,19 und 20 herstellen. Von 10Ac wurde eine Kristallstrukturanalyse angefertigt. Die Dienophil-Reaktivität von verschiedenen (Diacylmethylen)cyclopropanen 3 wird mit MNDO-Rechnungen untersucht.
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    Synthesen mit Nitrilen, LXXXII:Über Spiro[indan-pyrane] und Inden-propellane  -  Addukte von 1,3-Dicarbonylverbindungen an 2-(Dicyanmethylen)-1,3-indandion (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 1323-1328 
    Details
    ISSN: 0009-2940
    Keywords: Nitriles ; Spiro compounds ; Propellanes ; Indan derivatives ; Cycloaddition ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthese with Nitriles, LXXXII1). - On spiro [indan-pyrans] and Indene-propellanes - Adducts of 2-(Diccyanomethylene)-1,3-indandione with 1,3-Dicarbonyl CompoundsThe reactivity of 2-(dicyanomethylene)-1,3-indandione (1) towards 1,3-dicarbonyl compounds depends strongly on the nature of the CH acidic component. While the reaction with dimedone yields a spiro[chromene-4,2′indan] (2), indene-propellanes (3) are formed with acetoacetic esters. Adducts of acetylacetone and benzoylacetic acid ethyl ester to 1 have been identified as spiro[indan-2,2′-pyrans] (4). The propellane structure 3 is proven by X-ray analysis. Adducts 6 of CH acidic components with 3-(dicyanomethylene)-2-indolones 5 are used for reference measurements.
    Notes: 2-(Dicyanmethylen)-1,3-indandion (1) zeigt gegenüber 1,3-Dicarbonylverbindungen ein überraschend differenziertes Reaktionsverhalten, das von der CH-aciden Komponente abhängt. Während mit Dimedon ein Spiro[chromen-4,2′-indan] (2) entsteht, führt die Reaktion mit Acetessigsäure-ethyl- bzw. -tert-butylester zur Bildung der Inden-propellane 3. Die Addukte von Acetylacaton und Benzoylessigsäure-ethylester an 1 erweisen sich als Spiro[indan-2,2′-pyrane] (4). Die Propellanstruktur 3 wird durch eine Röntgenkristallstrukturanalyse abgesichert. Addukte 6 CH-acider Komponenten an 3-(Dicyanmethylen)-2-indolone 5 werden für Vergleichsmessungen verwendet.
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    URL: http://dx.doi.org/10.1002/cber.19891220716
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    Schwefel(IV)-Verbindungen als Liganden, IX: Molybdän-Rhodium-Zweikernkomplexe mit Schwefeldioxid als Brückenligand (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 1623-1627 
    Details
    ISSN: 0009-2940
    Keywords: Binuclear complexes ; Molybdenum complexes ; Rhodium complexes ; Sulfur dioxide bridges ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Sulfur(IV) Compounds as Ligands, IX.  -  Binuclear Molybdenum-Rhodium Complexes with Sulfur Dioxide as a Bridging LigandThe hetero-binuclear complexes [MoRhCl(CO)3(μ-SO2)(μ-Ph2E1CH2E3Ph2)(μ-Ph2E2CH2E4Ph2)] (E = P, As, 1-4), [MoRhBr(CO)3(μ-SO2)(μ-Ph2PCH2PPh2)2] (5) and [MoRh(CN)(CO)3(μ-SO2)(μ-Ph2PCH2PPh 2)2] (6) are the first compounds which contain sulfur dioxide as a bridging ligand connected to two metal atoms from different groups of the periodic table. The synthesis starts from Mo(CO)3(NCMe)3 (7), which reacts with the chelating ligands Ph2PCH2PPh2 (dppm), Ph2AsCH2PPh2 (dapm), and Ph2AsCH2AsPh2 (daam) to give the mononuclear precursors Mo(CO)3-(η2-Ph2E1CH2E3 Ph2)(η1-Ph2E2CH2E4 Ph2) (9-12). With [Rh2Cl2(CO)4] these are converted to the binuclear complexes [MoRhCl(CO)4(μ-Ph2E1CH2E3 Ph2)(μ-Ph2E2CH2E4Ph 2)] (15-18). Reversible CO/SO2 exchange finally gives 1-4 and the analogous bromide 5, the cyanide complex 6 is obtained from 1 and NaCN in liquid ammonia.
    Notes: Die heteronuklearen Zweikernkomplexe [MoRhCl(CO)3(μ-SO2)(μ-Ph2E1CH2E3Ph2)(μ-Ph2E2CH2E4Ph2)] (E = P, As, 1-4), [MoRhBr(CO)3(μ-SO2)(μ-Ph2PCH2PPh2)2] (5) und [MoRh(CN)(CO)3-(μ-SO2)(μ-Ph2PCH2PPh 2)2] (6) sind die ersten Verbindungen, in denen Schwefeldioxid als Brückenligand an zwei Metallatome aus verschiedenen Gruppen des Periodensystems gebunden ist. Die Synthese geht von Mo(CO)3(NCMe)3 (7) aus, das mit den Chelatliganden Ph2PCH2PPh2 (dppm), Ph2AsCH2PPh2 (dapm) und Ph2AsCH2AsPh2 (daam) zu den einkernigen Vorstufen Mo(CO)3(η2-Ph2E1CH2E3 Ph2) (η1-Ph2E2CH2E4 Ph2) (9-12) umgesetzt wird. Daraus entstehen mit [Rh2Cl2(CC)4] die Zweikernkomplexe [MoRhCl(CO)4(μ-Ph2E1CH2E3Ph 2)(μ-Ph2E2CH2E4Ph2)] (15-18). Reversibler CO/SO2-Austausch ergibt schließlich 1-4 und das analoge Bromid 5, der Cyanokomplexe 6 wird aus 1 und NaCN in flüssigem Ammoniak erhalten.
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    Organosubstituierte 2,5-Dihydro-1,2,5-azasilaborole  -  Herstellungsmethoden und spektroskopische Charakterisierung (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 1825-1850 
    Details
    ISSN: 0009-2940
    Keywords: Organoboranes, unsaturated ; Organosilanes, unsaturated ; Aminotriorganoborates ; Cyclization ; 2,5-Dihydro-organo-1,2,5-azasilaboroles ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Organosubstituted 2,5-Dihydro-1,2,5-azasilaboroles - Methods of Preparation and Spectroscopic CharacterisationThe compounds (E)-R22R2′ElIVC(R3) = C(R4)BR25 [(E)-1a to -g] are prepared from Na[R34,5BC ≡ CR3] with ClElIVR22R2′ [ElIV = Si, Ge, Sn] or from R22R2′SiC ≡ CR3 with BR34,5 (R4,5 = CH3, C6H5). The substituted silol 1z is obtained from (CH3)2Si(C ≡ CCH3)2 and B(C2H5)3, the mixture of (Z/E)-1t from (CH3)3SiC ≡ CH and B(C2H5)3. - ClSi(CH3)2C(CH3)2C(CH3)=C(C2H5)B(C2H5)Cl (C) reacts with LiN(CH3)2 to form (CH3)2NSi(CH3) 2C(CH3)2 C(CH3)=C(C2H5) B(C2H5)N(CH3)2 (E)-1n. - (E)-1a to (E)-1g or (E)-1a or (E)-1aGe and (E)-1aSn add MNH2 (M = Na, K) to yield the compounds MNH2-1, which react to the solid alkaline metal heterocycles M-2 after liberating R2H. From. (E)-1a or (E)-1b with LiNH2 the compounds (E)-C2H5CH=CR4Si(CH3)3 (A, B) are obtained. - On heating M-2a to M-2g eliminate R5H (C2H6) and smoothly from the solid compounds M-3, from which the heterocycles (4a-f) are prepared with CH3I. The 1-phenyl derivatives 5a, b are obtained from 4a,b with aniline. M-2c,d react with HCl to give the compounds 6c,d from which 7c,d are formed after C2H6 elimination. The 5-chloro compound 4i is used for the preparation of the heterocycles 4 with R5 = H, C(CH3)3, and N(CH3)2. - All compounds 1-7 are characterized by multinuclear NMR spectroscopy, the volatile compounds 1 and 4-7 also by their mass spectra.
    Notes: Die Verbindungen (E)-R22R2′ElIVC(R3) = C(R4)BR25 [(E)-1a bis -g] stellt man aus Na[34,5BC ≡ CR3] mit ClElIVR22R2′ [ElIV = Si, Ge, Sn] oder aus R22R2′SiC ≡ CR3 mit B34,5 (R4,5 = CH3, C6H5) her. Aus (CH3)2Si(C ≡ CCH3)2 und B(C2H5)3 sind das substituierte Silol 1z, aus (CH3)3)SiC ≡ CH und B(C2H5)3 im Autoklaven u. a. (Z/E)-1t zugänglich. - ClSi(CH3)2C(CH3) = C(C2H5)B(C2H5)Cl (C) und LiN(CH3)2 bilden (E)-1n. - (E)-1a bis (E)-1g bzw. (E)-1aGe und (E)-1aSn reagieren mit MNH2 (M = Na, K) zu den Additionsverbindungen MNH2-1, aus denen unter R2H-Abspaltung die festen Alkalimetall-Heterocyclen M-2 gebildet werden. (E)-1a und (E)-1b liefern mit LiNH2 (E)-C2H5CH=CR4Si(CH3)3 (A, B). - Aus M-2a bis M-2g erhält man beim Erhitzen unter R5H(C2H6)-Abspaltung glatt M-3, die mit CH3I zu den Heterocyclen (4a-f) reagieren. Die 1-Phenyl-Derivate 5a,b gewinnt man aus 4a,b mit Anilin. Aus M-2c,d sind mit HCl die Verbindungen 6c, d zugänglich, die unter C2H6-Abspaltung 7c,d liefern. Aus der 5-Chlor-Verbindung 4i stellt man die Heterocyclen 4 mit R5 = H, C(CH3)3 und N(CH3)2 her. - Sämtliche Verbindungen werden mit Multikern-NMR-Spektroskopie, die flüchtigen Verbindungen 1 und 4-7 auch massenspektrometrisch charakterisiert.
    Additional Material: 18 Tab.
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    URL: http://dx.doi.org/10.1002/cber.19891221004
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    Beiträge zur Chemie und Strukturchemie von Tris(diphenylphosphino)ethen und 1,1,4,4-Tetrakis(diphenylphosphino)-1,3-butadien (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 1857-1861 
    Details
    ISSN: 0009-2940
    Keywords: Tris(diphenylphosphino)ethene derivatives ; 1,1,4,4-Tetrakis(diphenylphosphino)-1,3-butadiene derivatives ; Molybdenum complex ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Contributions to the Chemistry and Structures of Tris(diphenylphosphino)enthen and 1,1,4,4-Tetrakis(diphenylphosphino)-1,3-butadieneReaction of tris(diphenylphosphino)ethene (1), obtained by basecatalyzed hydrophosphorylation of Ph2PC≡CPPh2 with Ph2PH, with 2 equivalents of H3B · OC4H8 affords 1,1-bis(boranatodi-phenylphosphonio)-2-(diphenylphosphino)ethene (2). Methylation of 1 with MeI gives the monoquaternary salt 3, the molecular structure of which was determined by X-ray crystallography. A trisulfide 4 is available by treatment of 1 with elemental sulfur. - 1,1,4,4-Tetrakis(diphenylphosphino)-1,3-butadiene (5) was isolated as a byproduct in the synthesis of 1. 1,1,4,4-substitution was established by X-ray analysis of the tetrasulfide 6, obtained by treatment of 5 with elemental sulfur. Reaction of 5 with 2 equivalents of Mo(CO)6 yields the symmetrical, dinuclear complex 7.
    Notes: Das durch basenkatalysierte Addition von Ph2PH an Ph2PC≡CPPh2 erhaltene Tris(diphenylphosphino)ethen (1) reagiert mit 2 Äquivalenten H3B · OC4H8 zu 1,1-Bis(boranatodiphenylphosphonio)-2-(diphenylphosphino)ethen (2). Die Behandlung von 1 mit Iodmethan liefert neben nicht näher untersuchten Spaltprodukten das Monoquartärsalz 3, in dem die Oniumfunktion am mittleren der drei Phosphoratome auftritt. Die Kristallstruktur wurde röntgenographisch bestimmt. Bei Behandlung von 1 mit Schwefel entsteht das Trisulfid 4.  -  Bei der Darstellung von 1 wird als Nebenprodukt 1,1,4,4-Tetrakis(diphenylphosphino)-1,3-butadien (5) gebildet. Die Substitution in den 1,1,4,4-Positionen wurde ebenfalls durch Röntgenstrukturanalyse des Tetrasulfids 6 bestätigt, das durch Reaktion von 5 mit elementarem Schwefel darstellbar ist. 5, dessen Bildungsmechanismus noch nicht geklärt ist, reagiert mit 2 Äquivalenten Mo(CO)6 zum zweikernigen Molybdänkomplex 7.
    Additional Material: 4 Tab.
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    URL: http://dx.doi.org/10.1002/cber.19891221006
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    Metallorganische Verbindungen der Lanthanoide, 50: N,N,N′-Trimethylethylendiamin-Derivate von Yttrium, Holmium und Lutetium (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 1897-1900 
    Details
    ISSN: 0009-2940
    Keywords: Cyclooctatetraenyl complexes ; Cyclopentadienyl complexes ; Lanthanide amides ; Organolanthanides ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Organometallic Compounds of the Lanthanides, 50.  -  N,N,N′ - Trimethylethylenediamine Derivatives of Yttrium, Holmium, and LutetiumThe reactions of LiN(CH3)CH2CH2N(CH3)2 with YCl3, HoCl3, LuCl3, as well as with (C5H5)2YCl and (C4H9C8H7)LuCl result in the formation of the amides Li[Ln{N(CH3)CH2CH2N(CH3)2}4] [Ln = Y (1), Ho (2), Lu (3)], Li[(C5H5)2Y{N(CH3)CH2CH2N-(CH3)2}2] (4), and Li[(C4H9C8H7)Lu{N(CH3)CH2CH2N(CH3)2}2] (5), respectively. The 1H- and 13C-NMR spectra of the new compounds as well as the X-ray crystal structure of 2 are reported and discussed.
    Notes: LiN(CH3)CH2CH2N(CH3)2 reagiert mit YCl3, HoCl3 und LuCl3, sowie mit (C5H5)2LuCl und (C4H9C8H7)LuCl unter Bildung der homoleptischen Amide Li[Ln{N(CH3)CH2CH2N(CH3)2}4] [Ln = Y (1), Ho (2), Lu (3)], sowie von Li[(C5H5)2Y{N(CH3)CH2-CH2N(CH3)2}2] (4) und Li[(C4H9C8H7)Lu{N(CH3)CH2CH2N-(CH3)2}2] (5). Die 1H- und 13C-NMR-Spektren der neuen Verbindungen und die Einkristall-Röntgenstrukturanalyse von 2 werden beschrieben und diskutiert.
    Additional Material: 1 Ill.
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    URL: http://dx.doi.org/10.1002/cber.19891221011
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    Kohlenwasserstoff-verbrückte Metallkomplexe, XII: Nucleophile Addition von Carbonylmetallaten an kationische Alkin- Molybdän-Komplexe: Ein gezielter Weg zu Heterodimetallatetrahedranen MM′C2 (M = Mo, W; M′ = Re, Mn, W) (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 1901-1906 
    Details
    ISSN: 0009-2940
    Keywords: Heterobimetallic complexes, alkyne-bridged ; Carbonyl complexes ; Molybdenum ; Tungsten ; Rhenium ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Hydrocarbon-Bridged Metal Complexes, XII.  -  Nucleophilic Addition of Carbonylmetallates to Cationic Alkyne Molybdenum Complexes: A Rational Way to Heterobimetallic Tetrahedranes MM′C2 (M = Mo, W; M′ = Re, Mn, Mo)The reactions of cationic alkyne complexes [Cp(L1)(L2)M(RC≡CR)]+ (L1 = CO, PR3, P(OMe)3; L2 = C2Me2, CO, P(OMe)3; M = Mo, W) with [Re(CO)5]- or [Mn(CO)5]- give heterobimetallic tetrahedranes Cp(OC)2M(μ2-η2:η2-RC≡CR)M′(CO)3L1 (M = Mo, W; M′ = Re, Mn) and Cp(OC)2Mo(μ2-η2:η2-MeC≡CMe)Re(CO)2[P(OMe)3]2. Similarly, the reaction of [Cp(OC)Mo(RC≡CR)2]+ or [Cp(Ph3P)(OC)Mo(RC≡CR)]+ with [CpW(CO)3]- provides a rational synthesis of Cp(OC)2Mo(μ2-η2:η2-RC≡CR)W(CO)2Cp. The dimetallatetrahedranes contain a semibridging CO group. The structures of Cp(OC)2Mo(μ2-η2:η2-H3CC≡CCH3)Re(CO)4 and Cp(OC)2Mo(μ2-η2:η2-H3CC≡CCH3)Re(CO)2[P(OMe)3]2 have been determined by X-ray crystallography.
    Notes: Die Umsetzung der kationischen Alkin-Komplexe [Cp-(L1)(L2)M(RC≡CR)]+ (L1 = CO, PR3, P(OMe)3; L2 = C2Me2, CO, P(OMe)3, M = Mo, W) mit [Re(CO)5]- oder [Mn(CO)5]- liefert die heterodimetallischen Tetrahedrane Cp(OC)2M(μ2-η2:η2-RC≡CR)M′(CO)3L1 (M = Mo, W;M′ = Re, Mn) und Cp(OC)2-(μ2-η2:η2-MeC≡CMe)Re(CO)2[P(OMe)3]2. Ebenso lassen sich in gezielter Weise aus [Cp(OC)Mo(RC≡CR)2]+ oder [Cp(Ph3P)-(OC)Mo(RC≡CR)]+ und [CpW(CO)3]- die Alkin-verbrückten Komplexe Cp(OC)2Mo(μ2-η2:η2-RC≡CR)W(CO)2Cp aufbauen. Die Dimetallatetrahedrane enthalten stets eine semiverbrückende CO-Gruppe. Die Strukturen von Cp(OC)2Mo(μ2-η2:η2-H3C-C≡CCH3)Re(CO)4 und Cp(OC)2Mo(μ2-η2:η2-H3CC≡CCH3)-Re(CO)2[P(OMe)3]2 wurden röntgenographisch bestimmt.
    Additional Material: 2 Ill.
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    URL: http://dx.doi.org/10.1002/cber.19891221012
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    Chemie der Triphenyl-(oder Tri-n-butyl-)pyridylphosphoniumsalze, 1 Neue Methode zur regioselektiven Einführung von Phosphoniumgruppen in N-heteroaromatische Ringsysteme (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 113-118 
    Details
    ISSN: 0009-2940
    Keywords: Phosphonium groups, introduction into N-heteroaromatic rings ; Pyridylphosphonium salts, tri-n-butyl- and triphenyl- ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Chemistry of Triphenyl-(or Tri-n-butyl)pyridylphosphonium Salts, 1. - Novel Method for the Regioselective Introduction of Phosphonium Groups into N-Heteroaromatic Ring SystemsN-Triflyl-heteroarylium triflates such as 3b and analogous salts of pyrazine, benzothiazole, and quinoline are transformed by regioselective reactions with phosphanes 4a and b into the title compounds 15a-f or 16, 17, 18a and b, respectively. With the salt 26 this reaction can be repeated to give the bis-cationic species 28a or b. Using the salt 15a as a representative, some aspects of the chemistry of heteroaryltriphenylphosphonium salts are described: Starting with the common precursor 15a, 2-acylated pyridines 21, 4,4′-bipyridines 23, and pyridylcarbinols 25 are accessible besides 28.
    Notes: N-Triflyl-heteroarylium-triflate wie 3b und analoge Salze des Pyrazins, Benzothiazols und Chinolins werden durch regioselektive Reaktionen mit Phosphanen 4a und b in die Titelverbindungen 15a-f bzw. 16, 17 und 18a, b übergeführt. Diese Reaktionsfolge läßt sich mit dem Salz 26 wiederholen, es entstehen die Biskationen 28a bzw. b. Am Beispiel des Salzes 15a werden Untersuchungen zur synthetischen Verwendbarkeit von Heteroaryltriphenylphosphoniumsalzen beschrieben: Aus der gemeinsamen Vorstufe 15a lassen sich neben 28 2-acylierte Pyridine 21, 4,4′-Bipyridine 23 und Pyridylcarbinole 25 herstellen.
    Additional Material: 2 Tab.
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    URL: http://dx.doi.org/10.1002/cber.19891220118
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    Cycloaddition of 4-Phenyl-4H-1,2,4-triazole-3,5-dione (PTAD) to 7-Alkylidene-2,3-benzonorbornadienes (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 133-143 
    Details
    ISSN: 0009-2940
    Keywords: Benzonorbornadiene ; Cycloaddition ; 4-Phenyl-4H-1,2,4-triazole-3,5-dione ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Cycloaddition von 4-Phenyl-4H-1,2,4-triazol-3,5-dion (PTAD) an 7-Alkyliden-2,3-benzonorbornadieneDie Umsetzung einer Reihe von Fulvenen 1a-f mit Dehydrobenzol führte zu den entsprechenden 7-Alkyliden-2,3-benzonorbornadienen 2a-f, deren Cycloadditionen mit PTAD untersucht wurden. Während das Phenyl-Derivat 2a kaum reagierte und nur Spuren des [2 + 2]-Cycloaddukts 3a lieferte, ergab das Phenylmethyl-System 2b das En-Produkt 3b in ansprechender Ausbeute. Im Falle der 6,6-Diphenyl- und 6,6-Bis(4-chlorphenyl)fulvene 2d und 2e wurden die Umlagerungs-Urazole 3d und 3e sowie die syn/syn- und syn/anti-Diastereomere 4d und 4e erhalten, die aus sukzessiven [4 + 2]-Cycloadditionen zweier Äquivalente PTAD resultierten. Die unsymmetrisch substituierten 7-(Diarylmethylen)benzonorbornadiene 2c (X = Ph, Y = p-MeOPh) und 2f (X = Ph, Y = p-NO2Ph) führten zu analogen Produkten, wobei die Umlagerungs-Urazole als Diastereomerenpaare E/Z-3c und E/Z-3f erhalten wurden. Im Falle von 2c konnte auch das oxidierte Monoaddukt 5c in geringer Ausbeute isoliert werden. Das Verhältnis der aus Umlagerung zu den aus [4 + 2]-Cycloadditionen resultierenden Urazolen steigt mit zunehmendem elektronenziehendem Charakter der Substituenten am Arylrest, d. h. es ist am höchsten für Y = p-NO2Ph und am niedrigsten für Y = p-MeOPh. NOE-Untersuchungen und Röntgenstrukturanalysen (von 3b, von 4d mit NMe statt NPh und von 5c) waren zur Bestimmung der Stereochemie dieser komplexen Produkte nötig.
    Notes: A series of 7-alkylidene-2,3-benzonorbornadienes 2a-f was prepared from the corresponding fulvenes 1a-f by reaction with benzyne. The cycloaddition of 2 with PTAD was investigated. While the phenyl derivative 2a was quite unreactive and afforded traces of the [2 + 2] cycloadduct 3a, the phenyl methyl system 2b led to the ene product 3b in fair yield. The diphenyl and bis-(4-chlorophenyl) cases 2d and 2e, respectively, led to a mixture of the rearrangement urazoles 3d and 3e and the double PTAD [4 + 2] cycloadducts 4d and 4e in form of the syn/syn and syn/anti diastereomers. Analogously, the unsymmetrically substituted 7-(diarylmethylene)benzonorbornadienes 2c (X = Ph, Y = p-MeOPh) and 2f (X = Ph, Y = p-NO2Ph) gave similar products, except that the possible diastereomeric rearrangement urazoles were formed (E,Z-3c and E,Z-3f). In the case of 2c the oxidized monocycloadduct 5c was also isolated in low yield. The ratio of rearrangement urazoles 3 to [4 + 2] cycloaddition products 4 increased with increasing electron withdrawal of the substituents on the aryl groups, i.e. it was largest for p-nitrophenyl and smallest for p-methoxyphenyl. NOE studies and X-ray analyses (of 3b, of 4d with NMe instead of NPh, and of 5c) were essential to assign the stereochemistry of these complex products.
    Additional Material: 5 Tab.
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    URL: http://dx.doi.org/10.1002/cber.19891220122
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    Deformation Density of a cis,cis-Trialkyltriaziridine (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 175-178 
    Details
    ISSN: 0009-2940
    Keywords: cis,cis-Trialkyltriaziridine ; Deformation density of cis,cis-Trialkyltriaziridine ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Deformationsdichte eines cis,cis-TrialkyltriaziridinsAuf der Basis von Tieftemperatur-Röntgebeugungsdaten (105 K) haben wir die Deformationsdichte von 6,8,9-Triacetoxy-2,3,4-triazatetracyclo[3.3.1.02,4.03,7] nonan (1) bestimmt. Mit der X-X-Methode konnten keine signifikanten Elektronendichtemaxima auf den stark gebogenen N—N-Bindungen gefunden werden. Die Dichtemaxima an den einsamen Elektronenpaaren der Stickstoffatome und in den C—C-, C—N- und C—O-Bindungen traten klar hervor.
    Notes: We determined the deformation densities of 6,8,9-triacetoxy-2,3,4-triazatetracyclo[3.3.1.02,4.03,7] nonane (1), a triaziridine derivative, from low temperature X-ray data (105 K). Significant electron density peaks of the strongly bent N—N bonds of the triaziridine ring could not be found by the X-X method. The density maxima of the lone pairs of the nitrogen atoms and of the C—C, C—N and C—O bonds appear clearly.
    Additional Material: 5 Ill.
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    URL: http://dx.doi.org/10.1002/cber.19891220127
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