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  • Analytical Chemistry and Spectroscopy  (1)
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  • 1
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The mass spectral fragmentation patterns of some diarylmethylene-bis-xanthates have been investigated and are compared with those for the 1,1,α,α-dibenzyl-thioacetals 1,1-diphenylmethane. The formation of a sulphenium cation is characteristic for the bis-xanthates. Their subsequent fragmentation is similar to that of thioesters. Also noteworthy is the appearance of ions having thio-ketone-like structures, except in the case of 1,1,α,α-diphenyl thioacetal 1,1-diphenylmethane. This is compared with the pyrolytic behaviour. The intensity of various metastable decompositions leading to the [benzophenone]+. ion in the first field free region depends mostly on the excess thermal energy.
    Notes: Das massenspektrometrische Verhalten der Diarylmethylen-bis-xanthogenate wird beschrieben und mit dem der Dithioacetale verglichen. Charakteristisch für alle untersuchten Verbindungen ist das Auftreten eines primär gebildeten Sulfenium-Kations, das für die Verbindungen ein den Thioestern analoges Fragmentierungsverhalten zeigt. Hervorzuheben ist das mit Thioketonstrukturen, deren Bildung mit der thermolytischen verglichen und diskutiert wird. Dabei ist bemerkenswert, dass die als Beleg dienenden metastabilen Signale für die Bildung des Fragments d aus dem 1. feldfreien Raum erst bei höheren Temperaturen auftreten und somit Abhängigkeit von der thermischen Überschussenergie zeigen.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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