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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1974 (1974), S. 1315-1321 
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Condensations with Methylene DisulfonesThe condensation between methylene bis(phenyl sulfone) (1a) and aldehydes takes place without rearrangement of a sulfonyl group. This is demonstrated by catalytic hydrogenation to the alkylidene bis(phenyl sulfones) 8. An independent synthesis for 8 is presented. Condensation of 1a with formaldehyde, on the other hand, gives the rearranged vinylene disulfone 12. - The methylene disulfones 1 are converted directly and in good yields to the Mannich bases 13 and 14, from which vinylidene disulfones 15 are obtainable.
    Notes: Bei der Kondensation von Methylenbis(phenylsulfon) (1a) mit Aldehyden erfolgt keine Umlagerung eines Sulfonrestes; das wird durch katalytische Hydrierung zu den Alkyliden-bis(phenylsulfonen) 8 und deren unabhängige Synthese gezeigt. Die Kondensation von 1a mit Formaldehyd führt dagegen zum umgelagerten Vinylendisulfon 12. - Erstmals sind die Mannich-Basen 13 und 14 von den Methylendisulfonen 1 direkt und in guten Ausbeuten hergestellt und daraus die Vinylidendisulfone 15 leicht zugänglich gemacht worden.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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