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  • Wiley-Blackwell  (131)
  • Springer Nature  (7)
  • American Association for the Advancement of Science (AAAS)  (4)
  • De Gruyter  (4)
  • 1985-1989  (146)
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  • 1
    Electronic Resource
    Electronic Resource
    Synthese und Stabilisierung von Isocyanatoketenen (1987)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 120 (1987), S. 285-290 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The isocyanatocarbonyl chlorides 1a-m were prepared and converted to the corresponding isocyanatoketenes 2a-m by means of hydrogen chloride elimination with triethylamine. (Isocyanatoalkyl)ketenes with less then three carbon atoms between the functional groups yield crosslinked and oligomeric products, respectively, by intermolecular reaction of the different heterocumulene systems. (ö-Isocyanatoalkyl)aldoketenes with three and more carbon atoms between the functional groups (2d-h) stabilize uniformly by [2 + 2]-cycloaddition of the ketene groups to yield 3-(ö-isocyanatoalkyl)-4-(ö-isocyanatoalkylidene)-2-oxetanones (3d-h) (diisocyanatodiketenes). (4-Isocyanatophenyl)ketene (21) and (3-isocyanato-1,5-pentanediyl)ketene (2k) stabilize in analogy to the unsubstituted parent compounds to give 6l and 4k, respectively.
    Notes: Die Isocyanatocarbonsäurechloride 1a-m wurden durch Chlorwasserstoff-Abspaltung mit Hilfe von Triethylamin in die entsprechenden Isocyanatoketene 2a-m übergeführt und ihre Stabilisierungsprodukte untersucht. (Isocyanatoalkyl)ketene mit weniger als drei Kohlenstoffatomen zwischen den funktionellen Gruppen reagieren unter Bildung vernetzter bzw. oligomerer Produkte infolge intermolekularer Reaktion der beiden kumulierten Doppelbindungssysteme. (ö-Isocyanatoalkyl)aldoketene mit drei und mehr Kohlenstoffatomen zwischen den funktionellen Gruppen (2d-h) stabilisieren sich ausschließlich durch [2 + 2]-Cycloaddition der Ketengruppen unter Ausbildung von 3-(ö-Isocyanatoalkyl)-4-(ö-isocyanatoalkyliden)-2-oxetanonen (3d-h) (Diisocyanatodiketenen mit ß-Lactonstruktur). (4-Isocyanatophenyl)keten (21) und (3-Isocyanato-1,5-pentandiyl)keten (2k) stabilisieren sich, wie von den isocyanatfreien Verbindungen bekannt, zum Cyclobutenolon 61 bzw. 1,3-Cyclobutandion 4k.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19871200306
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  • 2
    Electronic Resource
    Electronic Resource
    Schwefeldioxid als Ligand und Synthon. VII. Phosphan-Schwefeldioxid-Nickel(0)- und Palladium(0)-Komplexe (1988)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 565 (1988), S. 91-105 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Sulfur Dioxide as Ligand and Synton. VII. Phosphane Sulfur Dioxide Nickel (0) and Palladium (0) ComplexesSynthesis and properties of phosphane sulfur dioxid d10-metal complexes of the types ML2(SO2)2, ML2(SO2), and ML3(SO2) (M = Ni(0), Pd(0); L = t-phosphane) are described. In dependence on the phosphane coligands nickel(0) complexes with η1-planar, η1-pyramidal and η2-S.O. (side on) coordinated SO2 are formed. In the case of the palladium(0)-SO2 complexes hithero prepared the dominating coordination mode is the η1-pyramidal one.
    Notes: Synthese und Eigenschaften von Phosphan-Schwefeldioxid-d10-Metallkomplexen der Typen ML2(SO2)2, ML2(SO2) und ML3(SO2) (M = Ni(0), Pd(0); L = t-Phosphan) werden beschrieben. In Abhängigkeit der Phosphan-Coliganden entstehen Nickel(0)-SO2-Komplexe mit η1-planar, η1-pyramidal und η2-S.O (side on) koordiniertem SO2. Dagegen dominiert im Falle der bislang dargestellten Palladium(0)-SO2-Komplexe die η1-pyramidale Koordinationsgeometrie.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19885650110
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  • 3
    Electronic Resource
    Electronic Resource
    Mode of action of diptericin A, a bactericidal peptide induced in the hemolymph of Phormia terranovae larvae (1989)
    New York, NY [u.a.] : Wiley-Blackwell
    Archives of Insect Biochemistry and Physiology 10 (1989), S. 229-239 
    Details
    ISSN: 0739-4462
    Keywords: insect immunity ; antibacterial protein ; bacterial cytoplasmic membrane ; Chemistry ; Food Science, Agricultural, Medicinal and Pharmaceutical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: Diptericin A is a member of a multigenic family of antibacterial peptides that are synthesized by larvae of Phormia terranovae (Diptera) in response to a bacterial injection or to injury. The 82-residue peptide is active only against a limited range of Gram-negative bacteria. Data presented suggest that the primary action of diptericin A is on the cytoplasmic membrane of growing bacteria.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/arch.940100306
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  • 4
    Electronic Resource
    Electronic Resource
    Liquid crystals in biological systemsPaper presented at the meeting of the GDCh-Fachgruppe “Makromolekulare Chemie” on “Polymers and Biological Functions” in Bad Nauheim (Federal Republic of Germany) on April 18/19, 1988. (1989)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 166 (1989), S. 81-108 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Notwithstanding their more common beginnings, liquid crystals and molecular biology developed mainly parallel and independently during the last one hundred years.Molecule-phase relationships on the one and complex static-dynamic treatments on the other hand seem to forward mutually integrative views in our days.Biomesogen approaches will deepen our insights into the spatio-temporal coherences of biological systems. They might contribute significantly to the understanding of life processes.
    Additional Material: 23 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1989.051660106
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  • 5
    Electronic Resource
    Electronic Resource
    Hydrogen Migration in Transition Metal Alkyne and Related Complexes (1985)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 68 (1985), S. 1461-1506 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The electronic and structural characteristics of the reaction interconverting a l-alkyne complex into a vinylidene via a 1,2 hydrogen shift are examined. In a mononuclear system, initial slippage of the alkyne to an η1 geometry is indicated. The subsequent step is shown to be analogous to the isomerization of a methylvinyl cation. We conclude that an alternative route involving a hydrido-acetylide species will be of much higher energy. A concerted shift in binuclear and trinuclear systems is ruled out, based on the loss of a strong bonding interaction between the alkyne and the metallic piece, in the transition state. In trinuclear systems, a mechanism for the isomerization is suggested involving prior oxidative addition of the C—H bond across a metal-metal bond. The metallic piece in this case assists the transformation. The discussion is extended to other reactions featuring hydrogen shifts; these include the intramolecular formation of a binuclear vinylidene from a 1,2-hydrido-acetylide complex, the isomerization of a binuclear μ-alkylidyne into a μ-vinyl geometry and the transfer of a bridging hydrogen onto a capping hydrocarbon fragment in trinuclear cluster complexes.
    Additional Material: 17 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19850680602
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  • 6
    Electronic Resource
    Electronic Resource
    Strained Ketenes from α-Bromoacyl Phosphates. (Tricyclo[4.4.1.01,6]undeca-3,8-dien-11-ylidene)methanone and its Heptacyclic Dimer: a Dispirobridged Dipropellane (1,1″,4,4″,5,5″,8,8″-Octahydrodispiro[[4a, 8a]methanonaphthalene-9,1′-cyClobutane-3′,9″-[4a, 8a]methanonaphthalene]-2′, 4′-dione) (1988)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 71 (1988), S. 1930-1936 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Dehalogenation of the mixed anhydride 6 of 11-bromotricyclo[4.4.1.01,6] undeca-3,8-diene-11-carboxylic acid (4) and of diethyl hydrogen phosphate with Zn-Ag couple in THF gave the dispiro-fused dipropellane 8(1,1″,4,4″,5,5″,8,8″-octahydrodispiro[[4a, 8a]methanonaphthalene-9,1′-cyclobutane-3′,9″-[4a, 8a]methanonaphthalene]-2′,4′-dione) in 58% yield. Unlike other dispiro[2.1.2.1]octane-4, 8-diones (see 2a-e), the new cyclodimer 8 is an O2-sensitive compound. The 11-bromobicyclo[4.4.1] undeca-1,3,5,7,9-pentaene-11-carboxylic acid (13) was prepared and converted into the acyl phosphate 14, which in turn was reduced with Zn-Ag couple in THF/MeOD to give the deuterated ester 16. Other cyclopropylidenemethanones could be generated and dimerized advantageously by the Zn-induced reduction of the mixed anhydride of the 1-bromocyclopropanecarboxylic acid and diethyl hydrogen phosphonate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19880710812
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  • 7
    Electronic Resource
    Electronic Resource
    Diagnostic OH 1H-NMR shift differences in syn and anti ß-Hydroxy Ethers (1987)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 120 (1987), S. 331-333 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Die relative chemische Verschiebung des OH-Protonen-Signals in den 1H-NMR-Spektren eines Paares diastereomerer ß-Hydroxyether erlaubt eine syn/anti-Zuordnung der relativen Konfiguration. Dies basiert vermutlich auf der Bildung von Strukturen mit intramolekularer Wasserstoff-Brücke. Insofern ist diese Regel auf solche ß-Hydroxyether beschränkt, bei denen nur dieser Typ von intramolekularer H-Brücke ausgebildet werden kann.
    Notes: In a pair of diastereomeric ß-hydroxy ethers the relative 1H-NMR chemical shift of the OH proton is diagnostic for the syn or anti stereostructure. This is probably based on the presence of internally hydrogen-bonded structures. The rule is therefore restricted to those compounds for which only this type of internal hydrogen bonding is accessible.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19871200313
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  • 8
    Electronic Resource
    Electronic Resource
    Diazoverbindungen, 691) 2-(oder 4-)(Diazomethyl)-2-(oder 4-)H-benzopyrane - Synthese durch elektrophile Diazoalkansubstitution und katalytische Zersetzung (1987)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 120 (1987), S. 1397-1402 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Diazo Compounds, 691) - 2-(or 4-)(Diazomethyl)-2-(or 4-)H-benzopyrans - Synthesis by Electrophilic Diazoalkane Substitution and Catalytic DecompositionElectrophilic diazoalkane substitution of the (diazomethyl)phosphoryl compounds 9a-c with the benzopyrylium tetrafluoroborate 8 yields the 2-[diazo(phosphoryl)methyl]-2H-1-benzopyrans 10a-c and the 4-isomers 11a-c. Lithiated methyl diazoacetate reacts analogously with 8 under formation of 10d and 11d. At the μ-allylpalladium chloride catalyzed decomposition of 10a-d the benzoxepines 14a-d are formed by ring enlargement reaction; 1,2-H shift is responsible for the additional formation of the 2-methylene-2H shift is responsible for the additional formation of the 2-methylene-2H-benzopyrans 15b and c in the case of 10b and c. The catalytic decomposition of 11a-d proceeds exclusively in the sense of an intramolecular [2 + 1] cycloaddition to afford the 3,4-dihydro-2,3,4-metheno-2H-benzopyrans 18a-d. The benzoxepines 14a,d are characterized by photochemical electrocyclic reaction to 19a and b.
    Notes: Elektrophile Diazoalkansubstitution der (Diazomethyl)phosphoryl-Verbindungen 9a-c mit dem Benzopyrylium-tetrafluoroborat 8 liefert die 2-[Diazo(phosphoryl)methyl]-2H-1-benzopyrane 10a-c und die 4-Isomeren 11a-c. Lithiierter Diazoessigsäuremethylester reagiert analog mit 8 unter Bildung von 10d und 11d. Bei der μ-Allylpalladium-chlorid-katalysierten Zersetzung von 10a-d entstehen die Benzoxepine 14a-d durch Ringerweiterungsreaktion; 1,2-H-Verschiebung ist für die zusätzliche Bildung der 2-Methylen-2H-benzopyrane 15b und c im Fall von 10b und c verantwortlich. Die katalytische Zersetzung von 11a-d verläft ausschließlich im Sinne einer intramolekularen [2 + 1]-Cycloaddition zu den 3,4-Dihydro-2,3,4-metheno-2H-benzopyranen 18a-d. Die Benzoxepine 14a,d sind durch photochemische, elektrocyclische Reaktion zu 19a und b charakterisiert.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19871200817
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  • 9
    Electronic Resource
    Electronic Resource
    Highly alkylated cyclohexanes. - X-Ray crystal structures, force-field calculations, and conformations of cis/trans-1,4-disubstituted cyclohexane isomers (1988)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 121 (1988), S. 1469-1474 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Hochalkylierte Cyclohexane. - Röntgenstrukturanalyse, Kraftfeld-Berechnungen und Konformationen von cis/trans-1,4-disubstituierten Cyclohexan-IsomerenDie Struktur von mesyliertem cis- und trans-Tetramethylshisool cis-2 und trans-2 wurde durch Einkristall-Röntgenmethoden aufgeklärt. In cis-2 nimmt die Isopropenylgruppe im Kristall eine axiale Stellung ein, und die erhaltenen Strukturdaten stehen in gutem Einklang mit Kraftfeldberechungen. In trans-2 wurden zwei Rotamere, die durch Rotation der Isopropenylgruppe entstehen, durch NOE-Messungen zugeordnet. Der Vergleich der spektroskopischen Daten mit denen anderer Tetramethyllimonenderivate zeigt, daß diese in Verbindungen mit bevorzugt äquatorialer und bevorzugt axialer Lage der Isopropenylgruppe eingeordnet werden können.
    Notes: The structures of mesylated cis- and trans-tetramethylshisool cis- 2 and trans-2 have been elucidated by single-crystal X-ray techniques. In cis-2 the isopropenyl group adopts an axial position in the crystal, and the structural data obtained are in good agreement with those from force-field calculations. In trans-2 the two rotamers arising from rotation of the isopropenyl group were assigned by NOE measurements. Comparison of the spectroscopic data with those of other tetramethyllimonene derivatives showed that these can be classified into compounds with preferred equatorial and preferred axial position of the isopropenyl group.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19881210821
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  • 10
    Electronic Resource
    Electronic Resource
    Carben-Reaktionen, XVII. Nitrilylide durch 1,1-Eliminierung (1985)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 118 (1985), S. 634-642 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Carbene Reactions, XVII Nitrile Ylides via 1,1-EliminationThe 3-aminoquadricyclane-3-carbonitrile 7 decomposed upon vapor phase thermolysis into benzene and cyano(dimethylamino)carbene 15. Thermolysis of the corresponding benzylidene derivative 20 liberated the 1,3-dipole 21, which eventually leads to 1-isoindolecarbonitrile 23. The nitrile ylide 26 liberated similarly furnished the bicyclic compound 27 via intramolecular 1,3-dipolar addition.
    Notes: Das 3-Aminoquadricyclan-3-carbonitril 7 zerfällt bei der Gasphasenthermolyse in Benzol und Cyan(dimethylamino)carben 15. Die entsprechende Benzylidenverbindung 20 setzt bei der Thermolyse den 1,3-Dipol 21 frei, der sich zum 1-Isoindolcarbonitril 23 stabilisiert. Das analog freigesetzte Nitrilylid 26 ergab durch intramolekulare 1,3-dipolare Cycloaddition den Bicyclus 27.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19851180222
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