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  • 1
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 318 (1976), S. 1008-1018 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Action of Strong Bases on Quaternary Methallylammonium Compounds. III. Base-initiated Rearrangement of Methyldialkyl- and Trialkylmethallylammonium SaltsMethyl-diethyl-, methyl-dipropyl- and methyl-dibutyl-methallylammoniumiodide rearrange in the presence of sodium amide, sodium methylsulfinylcarbanion or butyllithium to give mainly the products of the [1,2]-Stevens-rearrangement with methallyl-ylid as an intermediate. Products of [1,2]-rearrangement of the bulky alkyl-groups with alkyl-ylid as an intermediate are formed in small amounts.In contrast to this and to the known degradation of trimethyl- and dimethylalkyl-methyallyl-ammonium salts the action of the bases on triethyl-, tripropyl- and tributyl-methallylammonium salts gives also the [1,4]-besides the [1,2]-rearrangement.
    Notes: Methyl-diäthyl-, Methyl-dipropyl- und Methyl-dibutyl-methallyl-ammoniumjodid liefern bei der Einwirkung von Natriumamid, Methylsulfinyl-carbanion oder Butyllithium bevorzugt [1,2]-Stevens-Umlagerungsprodukt über das Methallyl-Ylid. [1,2]-Verschiebungen der größeren Alkylgruppen über Alkyl-Ylide konnten nur in geringem Maße festgestellt werden.Im Gegensatz dazu und zu den schon früher beschriebenen Abbaureaktionen von Trimethyl- und Dimethylalkyl-methallyl-ammoniumsalzen wurden durch die Baseneinwirkung auf Triäthyl-, Tripropyl- und Tributyl-methallyl-ammoniumhalogenide zusätzlich zu den [1,2]- in größerem Umfang auch [1,4]-Umlagerungen nachgewiesen.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
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