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  • 1
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The phosphonium salts of triphenylphosphine [(C6H5)3PR′]X (R′ = CH2 · CH3, CH2 · COCH3, CH2 · COCH3, CH2 · COOCH3, CH2COOC2H5, CH2 · CN, CH2 · C6H5, CH2 · P(C6H5)3; X = Cl, Br) are reduced at the DME within the potential range of -1300-1700 mV. A one-electron mechanism is proposed. In acid solutions the tertiary phosphines formed by the electrode process react with protons giving catalytic hydrogen waves. The possibility of a catalytic evolution of hydrogen by “CH-acidic” phosphonium salts is discussed.
    Notes: Triphenylphosphoniumsalze des Typs [(C6H5)3PR′]X (R′ = CH2—CH3, CH2 · COCH3, CH2 · COOCH3, CH2COOC2H5, CH2 · CN, CH2 · C6H5, CH2 · P(C6H5)3; X = Cl, Br) werden bei Potentialen um -1300 bis -1700 mV an der Hg-Elektrode reduziert. Für den Elektrodenvorgang ist ein reversibler Einelektronenmechanismus zu diskutieren. Die Reduktionsprodukte reagieren unter bestimmten Bedingungen mit Protonen, was sich durch das Auftreten katalytischer Wasserstoffwellen äußert. Außerdem wird die Möglichkeit der katalytischen Wasserstoffabscheidung infolge „CH-acider“-Phosphoniumsalze erörtert.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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