Photooxidation of Methyldithiepins into Dithiepin Carboxaldehydes in Carbon Tetrachloride
摘要:
[GRAPHICS]Methyldihydrodithiepins are converted into the corresponding carboxaldehydes via a simple and efficient oxidation by oxygen in carbon tetrachloride. The reaction is not a radical chain process, The proposed mechanism involves photoinduced electron transfer from the starting dithiepin to solvent (CCl4) followed by a series of events depicted in Scheme 1, The critical feature of the mechanism is that formation of superoxide (O-2(.-)) is avoided, preventing direct oxidation of sulfur atoms.