Methylthio peroxy

Methylthio peroxy OO-SCH3 11 46 Pulse laser photolysis 1992TUR/BAR... 

The reaction of thioacetals with two equivalents of peroxy acids generally affords epimeric gem-disulfoxides, the ratio of epimers being subject to kinetic and/or equilibrium control (70). However, Poje, Sikirica, Vickovic, and Bruvo (71) have reported the first example of a stereospecific oxidation in the gem-disulfide series. They found that 2,2-bis(methylthio)-l,3-diphe-nylpropane is smoothly oxidized to the corresponding meso-disulfoxide with m-chloroperbenzoic acid. The study of conformational properties in solution by nmr indicated that the meso-disulfoxide exists in conformation 119 which... 

Reduction of the 1,3-dithiolium cation with hexacarbonylvanadate anion yields the colourless dimer (46), which can be oxidized to tetrathiafulvalene with manganese dioxide. Reduction of 2-methylthio-l,3-dithiolium salts with sodium borohydride and treatment of the resulting 2-methylthio-l,3-dithiole with fluoroboric acid provides a convenient small-scale preparation of 1,3-dithiolium fluoroborate. The method has been extended to the preparation of l-selena-3-thiolium and 1,3-diselenolium fluoroborates. For large-scale preparation of the 1,3-dithiolium cation, the route involving peroxy-acid oxidation of l,3-dithiole-2-thione and isolation of the hexafluorophosphate is recommended. This method fails with selenium-containing compounds. ... 

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