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  • 1975-1979  (1)
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  • 1
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Cyclic conjugate 5 and 7 Membered Ring Systems, IV. Note on the Synthesis of 8-AcetylheptadulveneHydride abstraction of acetonyl-1,3,5-cycloheptatriene (1) with triphenylmethylium perchlorate affords acetonyltropylium perchlorate (4) which on deprotonation with triethylamine gives 8-acetylheptafulvene (5). On reaction with dimethyl acetylenedicarboxylate 5 undergoes an [8 + 2]-cycloaddition; subsequent dehydrogenation gives dimethyl 3-acetyl-1,2-azulenedicarboxylate (6).
    Notes: Acetonyl-1,3,5-cycloheptatrien (1) läßt sich durch Hydrid-Abstraktion mit Triphenylmethyliumperchlorat in das Acetonyltropyliumperchlorat (4) überführen, aus dem durch Deprotonierung mit Triethylamin das 8-Acetylheptafulven (5) erhalten wird. Dieses reagiert mit Acetylendicarbonsäure-dimethylester in einer [8 + 2]-Cycloaddition und nachfolgender Dehydrierung zum 3-Acetyl-1,2-azulendicarbonsäure-dimethylester (6).
    Type of Medium: Electronic Resource
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