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  • 1
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Organic Sulfur Compounds, LX. The Formation of Methylene Bisxanthogenates by Action of Diaryldiazomethanes on Dialkyl Xanthogen Disulfides and their FragmentationS - S-Insertion reactions were observed when diaryldiazomethanes 1 were allowed to react with dialkyl xanthogen disulfides 2 (see (2)). Identification of the reaction products asmethylene bisxanthogenates 3 was confirmed by additional preparation of 3 by reaction of the gem. dichlorides 4 with potassium xanthogenates 5 (see (3)) as well as by the n.m.r. spectra. Dibenzyl-, dibenzoyl-disulfides, and tetramethyl-thiuramdisulfide do not undergo an analogous reaction with diphenyldiazomethane. The bisxanthogenates 3 decompose at room temprature in the solid state and in solution to give the corresponding thioketones (see (4)-(6)). The diarylderivatives 3a and 3e, however, are stable in the solid state. The fragmentation is facilitated by using ethanol, dimethylformamide or pyridine as solvents. The mechanism of the fragmentation is discussed.
    Notes: Die unter S - S-Insertion verlaufenden Reaktionen der Diaryldiazomethane 1 mit den Dixanthogenen 2 führen gemäß (2) zu den Diarylmethylen-bis-xanthogenaten 3, deren Konstitution durch direkten Vergleich mit den aus den gem. Dichloriden 4 und den Kaliumxanthogenaten 5 nach (3) gewonnenen Verbindungen sowie durch die NMR-Spektren sichergestellt wurde. Dibenzyl- und Dibenzoyldisulfid sowie Tetramethyl-thiuramdisulfid lassen sich mit Diphenyldiazometan nicht analog umsetzen. Die Bis-xanthogenate 3 fragmentieren bei Raumtemp. in Festsubstanz mit Ausnahme der Diphenyl-Derivate 3a und 3e, in Lösungsmitteln jedoch ohne Ausnahme, in die entsprechenden Thioketone, siehe Gleichungen (4)-(6). Wärmezufuhr und Lösungsmittel wie Äthanol, DMF oder Pyridin begünstigen die Fragmentierung, deren Mechanismus diskutiert wird.
    Type of Medium: Electronic Resource
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