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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 116 (1983), S. 2408-2417 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: AcenazulenedionesReactions of 8-methoxyheptafulvene (1) and quinones 2 give in [8+2]-cycloadditions hydroacenazulenediones 3, which are immediately transformed to acenazulenediones 4 and 5. The yields in the reaction sequence depend on the half-wave-reduction-potentials (E1/2) of 2. Only compounds 2 with E1/2 (in acetonitrile, vs s.c.e.) lower than - 0.5 V lead to cycloadducts in reasonable yields. Properties of the ground and excited states of 4 and 5 are characterized by spectroscopic methods and molecular-orbital-calculations.
    Notes: Die Titelverbindungen 4 und 5 werden über [8+2]-Cycloadditionen aus 8-Methoxyheptafulven (1) und den Chinonen 2 dargestellt. Die Ausbeuten an 4 und 5 hängen von den Halbstufen-Reduktionspotentialen (E1/2) der Chinone 2 ab. Die Cycloadditionen werden nur bei Chinonen mit E1/2 〈 -0.5 V (in CH3CN, vs SCE) beobachtet; stärker oxidierende Chinone führen zur Polymerisation von 1. Die Grundzustandseigenschaften und Eigenschaften der angeregten Zustände von 4 und 5 werden durch spektroskopische Methoden und Berechnungen charakterisiert.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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