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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 105 (1972), S. 2398-2418 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Anodic Addition of Anionized 1.3-Dicarbonyl Compounds to OlefinesSodio-dimethyl malonate (1), -acetylacetonate (2) and -methyl acetoacetate (3) can be added anodically to cyclohexene, ethyl vinyl ether, styrene, α-methylstyrene and butadiene. Products are additive dimers (2.3-diphenylbutanes, 1.5-dienes) and bifunctional substituted monomers (acetals of ω-ketoesters, cyclic ortho esters, 2.3-dihydrofuranes). The product formation seems to be initiated by le-oxidation of 1-3 to bis(carbonyl)methyl radicals, which add to double bonds. These adducts combine to additive dimers and/or are oxidized to carbonium ions, which are solvolyzed by methanol or cyclize intramolecularly.
    Notes: Natrium-malonsäure-dimethylester (1), -acetylacetonat (2) und -acetessigsäure-methylester (3) lassen sich anodisch in Stromausbeuten zwischen 20 und 60% an Cyclohexen, Äthylvinyläther, Styrol, α-Methyl-styrol und Butadien addieren. Als Produkte werden additive Dimere (2.3-Diphenyl-butan-Derivate, 1.5-Diene) und bifunktionell substituierte Monomere (Acetale von γ-Ketoestern, cyclische Orthoester, 2.3-Dihydro-furane) isoliert. Die Bildung der Addukte dürfte mit der 1 e-Oxydation von 1-3 zu Bis-carbonyl-methyl-Radikalen beginnen, die sich an Doppelbindungen addieren. Die Primäraddukte stabilisieren sich durch Kombination zu additiven Dimeren und/oder werden anodisch zu Carbonium-Ionen oxydiert, die methanolysieren oder intramolekular cyclisieren.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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