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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 112 (1979), S. 355-362 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis of 1-Alkenyl- and 1-Cycloalkenylphosphonium Salts by Selenenylation of Phosphorus Ylides and Subsequent Seleninic Acid EliminationAlkylidenephosphoranes (phosphorus ylides) can be mono- or diselenenylated with phenylselenenyl bromide, dependent on the number of α-H-atoms in the starting phosphonium salt. Accordingly [1-(phenylseleno)alkyl]- and [1,1-bis(phenylseleno)alkyl]phosphonium salts 2a-e and 1, resp., are obtained. Oxidative elimination of the phenylseleno residue in 2a-e as phenylseleninic acid leads to 1-alkenylphosphonium salts 3a-e in high yields. Hydrolysis of cycloalkenylphosphonium salts 3c - e gives cycloalkenylphosphane oxides 4c-e. These can also be prepared by selenenylation of the corresponding cycloalkylphosphane oxides and subsequent PhSeO2H elimination. Some reactions and properties of the new compounds are examined.
    Notes: Alkylidenphosphorane (Phosphor-Ylide) können ein- bzw. zweifach, je nach der Zahl der α-H-Atome des Ausgangs-Phosphoniumsalzes, mit Phenylselenenylbromid selenenyliert werden. Dabei entstehen [1-(Phenylseleno)alkyl]- bzw. [1,1-Bis(phenylseleno)alkyl]triphenylphosphonium-Salze 2a - e bzw. 1. Oxidative Eliminierung der Phenylseleno-Gruppe von 2 als Phenylseleninsäure liefert in hohen Ausbeuten 1-Alkenyltriphenylphosphonium-Salze 3a-e. Hydrolyse der Cycloalkenylphosphonium-Salze 3c-c ergibt (1-Cycloalken-1-yl)phosphanoxide 4c-e. Diese können wiederum aus Cycloalkylphosphanoxiden durch Selenenylierung und nach-folgende PhSeO2H-Eliminierung hergestellt werden. Einige Eigenschaften und Reaktionen der neuen Verbindungen werden mitgeteilt.
    Type of Medium: Electronic Resource
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