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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 107 (1974), S. 2383-2396 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Preparation of Benzazulenes from Azulene Derivatives6-Methylazulene (1), the 4-methylazulenes 10, and 1-azuleneacetonitrile (14) condense in the presence of sodium methoxide with the trimethinium perchlorates 2 to yield the coloured azulene-dienamines 3, 11, and 15. Upon heating to 160-200°C 3 and 15 undergo cyclization with evolution of dimethylamine to form benzoanellated products, benz[f]azulenes (5) and benz[a]azulenes (16), whereas 11 yields cyclopenta[e,f] heptalenes (13). 1 also condenses with pentamethinium perchlorates 7 to form azulene-trienamines 8, which thermally cyclize to 6-phenylazulenes 9. The azuleno[1,2-b]pyridine 21 is obtained from the 1-aminoazulene 17 via the intermediate dimethylaminoallylidene derivative 20.
    Notes: 6-Methylazulen (1), die 4-Methylazulene 10 und 1-Azulenacetonitril (14) kondensieren in Gegenwart von Natriummethylat mit den Trimethinium-perchloraten 2 zu den farbigen Azulen-dienaminen 3, 11 und 15. Beim Erhitzen auf 160 -200°C cyclisieren 3 und 15 unter Dimethylamin-abspaltung zu benzoanellierten Produkten, Benz[f]azulenen (5) und Benz[a]-azulenen (16), dagegen ergibt 11 Cyclopenta[e,f]heptalene (13). 1 kondensiert auch mit den Pentamethinium-perchloraten 7 zu Azulen-trienaminen 8, die thermisch zu 6-Phenylazulenen (9) ringschließen. Aus dem 1-Aminoazulen 17 erhält man über die Dimethylaminoallyiden-Verbindung 20 das Azuleno[1.2-b]pyridin 21.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 107 (1974), S. 2956-2975 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis of Polycyclic AzulenesThe condensation of 6-dimethylamino-2-(dimethyliminiomethyl)fulvene perchlorate (2) with acidic three-carbon components, e. g. diethyl glutaconate (3c), leads to the formation of deeply coloured polyeneamines. These cyclize on heating with elimination of dimethylamine to yield azulenes substituted in the seven-membered ring. In an analogous manner from 2-methylchromone, 1-acenaphthenone, and fluorene with 2 the polycyclic compounds 7, 8, and 11, were prepared. The azulenoid hydrocarbon 15a, isomeric with 11, was synthesized from 1-acenaphthenone by the Ziegler-Hafner method. Quantum-chemical calculations on 11 and 15a were carried out by means of the semiempirical SCF LCAO MO + CI method.
    Notes: Kondensation von 6-Dimethylamino-2-(dimethyliminomethyl)fulven-perchlorat (2) mit aciden Dreikohlenstoffkomponenten, wie z. B. Glutaconsäure--diäthylester (3c), führt zu tieffarbigen Polyenaminen, die beim Erwärmen unter Dimethylamin-Abspaltung zu im Siebenring substituierten Azulenen 5 cyclisieren. Analog erhält man aus 2 mit 2-Methylchromon, 1-Acenaphthenon und Fluoren die polycyclischen Verbindungen 7, 8 und 11. Ein zu 11 isomerer, azulenoider Kohlenwasserstoff 15a wurde nach einer Ziegler-Hafner-Synthese von 1-Acenaphthenon aus aufgebaut. Für 11, und 15a wurden nach der semiempirischen SCF LCAO MO + CI-Methode quantenchemische Berechnungen ausgeführt.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 10 (1971), S. 808-809 
    ISSN: 0570-0833
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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