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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1977 (1977), S. 116-144 
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reactions of o-Benzoquinones with 1,3-Diarylbenzo[c]furanso-Benzoquinones 1, 1,2-naphthoquinone and 9,10-phenanthrenequinone react with benzo[c]-furans 2 and the fluorantheno[8,9-c]furan (7) to give the [4π + 4π] cycloadducts 3, 8, 14, 21, and the dioxoles 4, 9, 15, 22. Investigations on the systems 1f/2b and 1f/2h concerning the mechanism (solvent and temperature dependence of the distribution of the products and the rate constants) show that isopolar transition states are involved. Calculations of perturbation with the model systems 1a and benzo[c]furan are reported.
    Notes: Die o-Benzochinone 1, 1,2-Naphthochinon und 9,10-Phenanthrenchinon reagieren mit den Benzo[c]furanen 2 und dem Fluorantheno[8,9-c]furan (7) unter Bildung der [4π + 4π]-Cycloaddukte 3, 8, 14 und 21 sowie der Dioxole 4, 9, 15 und 22. Untersuchungen zum Mechanismus an den Systemen 1f/2b und 1f/2h (Lösungsmittel- und Temperaturbhängigkeit der Produktverteilung und der RG-Konstanten) zeigen, daß isopolare Übergangszustände durch-laufen werden. Über Störungsrechnungen mit den Modellsystemen 1a und Benzo[c]furan wird berichtet.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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