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  • Inorganic Chemistry  (11)
  • ASTRONOMY  (3)
  • 1985-1989  (14)
  • 1955-1959
  • 1986  (14)
  • 1
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    Unknown
    In:  Other Sources
    Publication Date: 2011-08-19
    Description: Observations covering a period of 20 years show that the large proper motion (4.08 arcsec/yr) of the nearly triple system 40 Eridani-ABC will cause its brightest member, A, to pass within 3 arcsec of a faint background star. The originally hoped-for primary gravitational lens effect will therefore not take place although a minor secondary effect may occur near the time of closest approach on June 1, 1987.
    Keywords: ASTRONOMY
    Type: Astronomical Society of the Pacific, Publications (ISSN 0004-6280); 98; 1199
    Format: text
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  • 2
    Publication Date: 2019-06-28
    Description: Calibrated IUE spectrograms from an Atlas of Planetary Nebulae are shown, and the organization of the Atlas is described.
    Keywords: ASTRONOMY
    Type: ESA Proceedings of an International Symposium on New Insights in Astrophysics. Eight Years of UV Astronomy with IUE; p 299-301
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  • 3
    Publication Date: 2019-06-28
    Description: The eclipsing RS CVn system AR Lacertae was observed with IUE in October 1981 and October 1983. The phase coverage provided by the 1983 data is adequate to determine the location and size of two plage-like regions in the atmosphere of the K star using a Doppler imaging analysis of the Mg II k lines. A third epoch data set, consisting of many spectra spaced uniformly throughout a single orbital cycle was obtained in September 1985. Rotational modulation of the SWP line fluxes and an initial look at the Mg II lines reveals clear evidence of discrete chromospheric structures. These include a localized flare on the G star, a chromospherically inactive hemisphere on the G star, and plages on the K star.
    Keywords: ASTRONOMY
    Type: ESA Proceedings of an International Symposium on New Insights in Astrophysics. Eight Years of UV Astronomy with IUE; p 153-154
    Format: text
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 119 (1986), S. 2339-2349 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Concerning the Question of Positional Isomerism in Disubstituted BullvalenesWe report about 15 new disubstituted bullvalenes (2, 4, 5, 11, 12, 14-20, 22-24) and discuss their substitution pattern together with 9 known species (1, 3, 6-10, 13, 21). The results which are partly unexpected are put together phenomenologically. We have no reasonable explanation for some results, i.e. only a few substituents with „complementary“ properties like the pair CH2OH/Br or CH3/CN in compounds 16 and 18, respectively, prefer a vicinal arrangement at a double bond.
    Notes: Wir berichten über 15 neue disubstituierte Bullvalene (2, 4, 5, 11, 12, 14-20, 22-24) und diskutieren ihr Substitutionsmuster gemeinsam mit dem von 9 bekannten Vertretern (1, 3, 6-10, 13, 21). Die teilweise unerwarteten Ergebnisse werden phänomenologisch geordnet. Für einige Befunde fehlen befriedigende Erklärungen. So bevorzugen z. B. nur manche Substituenten mit „komplementären“ Eigenschaften wie das Paar CH2OH/Br oder CH3/CN in den Verbindungen 16 bzw. 18 eine vicinale Anordnung an der Doppelbindung.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reactive π-Complexes of the Group VIII Transition Metals, I. (η6-Arene)(η5-2,5-dihydro-1,2,5-thiadiborol)iron: Syntheses from Bis(arene)iron and Arene-bis(ethene)ironBis(arene)iron 1a - e, (arene = p-xylene, benzene, benzotrifluoride, 1,4-difluorobenzene) react in the temperature range of -100 to -60°C with 3,4-diethyl-2,5-dihydro-2,5-dimethyl-1,2,5-thiadiborole (thiadiborolene, 2) to form reactive intermediates which decompose at -30°C and (η6-arene)(η5-thiadiborolene)iron 3a - e are obtained. Alternatively, the synthesis is achieved via arene-bis(ethene)iron 4a,c (arene = p-xylene, benzene), which is formed from 1a,c and ethene at low temperature. Reactions, spectroscopic data, and the crystal structure of (η6-benzene)(η5-thiadiborolene)iron (3c) are reported.
    Notes: Bis(aren)eisen 1a - e (Aren = p-Xylol, Toluol, Benzol, Benzotrifluorid, 1,4-Difluorbenzol) reagieren im Temperaturbereich von - 100 bis -60°C mit 3,4-Diethyl-2,5-dihydro-2,5-di-methyl-1,2,5-thiadiborol (Thiadiborolen, 2) zu reaktiven Zwischenverbindungen, die durch Zersetzung bei -30°C (η6-Aren)(η5-thiadiborolen)eisen 3a - e ergeben. Alternativ gelingt die Synthese über Aren-bis(ethen)eisen 4a, c (Aren = p-Xylol, Benzol), welche bei tiefen Temperaturen aus 1a, c und Ethen darstellbar sind. Reaktionen, spektroskopische Daten und die Kristallstruktur von (η6-Benzol)(η5-thiadiborolen)eisen (3c) werden mitgeteilt.
    Additional Material: 1 Ill.
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 119 (1986), S. 1734-1736 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: McMurry Reaction of 2-Alkyl-3-ethoxyacroleinsMcMurry reductive coupling of 2-alkyl-3-ethoxyacroleins 1 yields 2,5-dialkylhexadienedials 6. (E) Configuration at the 2,3- and 4,5-double bonds of these dialdehydes is derived from three-bond carbon-13 proton coupling. A mechanism similiar to that discussed for McMurry coupling of carbonyl compounds is proposed.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 119 (1986), S. 1745-1749 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Synthesis of New 1λ6,2,6-Thiadiazines by Condensation with S,S-Dialkylsulfur DiimidesReactions of ketene mercaptals 1a, b, d with S,S-dialkylsulfur diimides 2a - c lead to colourless 1λ6,2,6-thiadiazines 4a - i; reaction of 1c with 2a - c leads to ring-open products 3a - c. 5-Methyl-substituted 1λ6,2,6-thiadiazines 6a, c, d can be prepared by condensation of S,S-dialkylsulfur diimides 2a, c, d with acrylic acid derivative 5.
    Additional Material: 2 Tab.
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 119 (1986), S. 2553-2565 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: 3,4-Dihydroisochinoline, II. 4,5,7,8-Tetrahydrocyclopenta[4,5]pyrimido[6,1-a]isoquinoline: A Novel Ring System via 1-(3-Furyl)-3,4-dihydroisoquinoline TransformationFuran 1 readily reacts with excess isocyanate 2a to yield the [1:3]-adduct 3, which was cyclized under mild conditions to give the fulvene derivative 4a. Reaction of the latter with isocyanate 2b leads to 4c-f. The structures of 3 and 4 are derived from analytical and spectroscopic data and by an X-ray structure analysis (4a). A possible pathway for the formation of 3 and 4a is discussed.
    Notes: Das Furanderivat 1 bildet mit überschüssigem Isocyanat 2a das [1:3]-Addukt 3, das unter milden Bedingungen zum Fulvenderivat 4a ringgeschlossen wird. Die Umsetzung von 4a mit dem Acylisocyanat 2b führt zu 4c-f. Die Strukturen von 3 und 4 wurden anhand der analytischen und spektroskopischen Befunde, für 4a auch durch Röntgenstrukturanalyse ermittelt. Der mögliche Bildungsweg von 3 und 4a wird diskutiert.
    Additional Material: 1 Ill.
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 119 (1986), S. 129-140 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reaction of 2,2-Dichloromalonamides and 2,2-Dichloromalonamoyl Chlorides with Nucleophilic ReagentsReaction of 2,2-dichloromalonamides 1a-c with mononucleophilic reagents leads to substitution of both chlorine atoms at the amidine carbon atoms. With 4-nitrophenol or 4-chlorothiophenol the malonamides 2a-c and 3a, b, resp., and with diethylamine or benzylamine the guanidines 4a-c and 5a-c, resp., are obtained. When reacting with bisnucleophiles the substitution is followed by a cyclization. Thus, the reaction products with hydrazines turn out to be the spiro compounds 6a, 7a-c, and 8a-c, with benzamidine the compounds 10a-c and 11a, and with 2-aminobenzimidazole 12a. The reaction with 2-aminothiophenol after dehalogenization of the CCl2 group leads to compounds 13. The 2,2-dichloromalonamoyl chlorides 14a, b, d, e react with 4-nitrophenol to form the esters 18a, b, d, e and with amines to form the malonamides 15a, b, d, e, 16a, b, d, e, and 17b, d, e. The reaction with thiophenols and (nitrophenyl)hydrazines is accompanied with a reduction of the CCl2 group yielding the compounds 19a, b, d, e, 20a, b, d, e, 23, and 21a, d, e, 22b, respectively.
    Notes: Die 2,2-Dichlormalonamide 1a-c reagieren mit mononucleophilen Reagenzien unter Substitution beider Chloratome an den Amidinkohlenstoffen; mit 4-Nitrophenol bzw. 4-Chlorthiophenol entstehen die Malonamide 2a-c bzw. 3a, b mit Diethyl- bzw. Benzylamin die Guanidine 4a-c bzw. 5a-c. Bei Umsetzungen mit Bisnucleophilen schließt sich an die Substitution eine Cyclisierung an: mit Hydrazinen entstehen die Spiroverbindungen 6a, 7a-c und 8a-c, mit Benzamidin die Verbindungen 10a-c sowie 11a und mit 2-Aminobenzimidazol 12a. Die Reaktion mit 2-Aminothiophenol ist zusätzlich mit einer Dehalogenierung der CCl2-Gruppe zu 13 verbunden. Die 2,2-Dichlormalonamoylchloride 14a, b, d, e reagieren mit 4-Nitrophenol unter Bildung der Ester 18a, b, d, e bzw. mit Aminen zu den Malonamiden 15a, b, d, e, 16a, b, d, e und 17b, d, e. Die Umsetzung mit Thiophenolen bzw. (Nitrophenyl)hydrazinen verläuft stets unter Reduktion der CCl2-Gruppe zu den Verbindungen 19a, b, d, e, 20a, b, d, e und 23 bzw. 21a, d, e und 22b.
    Additional Material: 2 Tab.
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 119 (1986), S. 1374-1399 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Directed Synthesis of Translationally Isomeric [3]-Catenanes1)In a multi-step reaction sequence the tetrahydroxymetacyclophane 12c is synthesized. Acetalisation with 1,25-dichloro-13-pentacosanone followed by nitration and reduction afforded the diamine 13c. By cyclization of this compound in 2-pentanol with sodium carbonate and sodium iodide under high dilution conditions the monomeric products 16, 17, and 18 are obtained in yields of 21.4, 7.7, and 0.9%, respectively. On the basis of mass, 13C NMR and 1H NMR spectra the structure of these compounds is discussed. Starting from the precatenane 16 the [3]-catenanes 25a, b,c and 26a, b, c are obtained in a multi-step reaction sequence. The structure of these compounds is confirmed by mass, 13C NMR, and 1H NMR spectroscopic investigations.
    Notes: In einer vielstufigen Synthese wird das Tetrahydroxymetacyclophan 12c synthetisiert. Durch Acetalisierung mit 1,25-Dichlor-13-Pentacosanon, nachfolgender Nitrierung und Reduktion wird das Diamin 13c erhalten. Dessen Cyclisierung in 2-Pentanol in Gegenwart von Natriumcarbonat und Natriumiodid unter Verdünnungsbedingungen ergibt die monomeren Cyclisierungsprodukte 16, 17 und 18 in Ausbeuten von 21.4. 7.7 und 0.9%. Die Struktur dieser Verbindungen wird anhand der Massen-, 13C- und 1H-NMR-Spektren diskutiert. In einer mehrstufigen Reaktionsfolge werden aus dem Prä-[3]-catenan 16 die [3]-Catenane 25a, b, c und 26a, b, c erhalten. Die Struktur dieser Verbindungen wird durch 13C-NMR, 1H-NMR- und massenspektroskopische Untersuchungen bewiesen.
    Additional Material: 1 Ill.
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