Mn(III)-based reactions of alkenes and alkynes with thiols. An approach toward substituted 2,3-dihydro-1,4-oxathiins and simple route to (E)-vinyl sulfides
reaction with thioglycolic acid gave 1,4-oxathiolan-2-one 7. While thiyl radicals easily formed by manganese(III) oxidation with ethanethiol or benzenethiol reacted with alkynes to give preferentially (E)-vinyl sulfides 10 in quantitative yields.