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Abstract
(Alkylthio)chloroacetylenes react with potassium O-alkyl carbonodithioates under mild conditions (25–30°C, DMSO) to form an approximately equimolar mixture of O-alkyl-S-[2-(alkylthio)ethynyl] carbonodithioates and S-alkyl-S-[2-(alkylthio)ethynyl] carbonodithioates in a total yield of up to 65%. The rearrangement is proved to occur in an anionic intermediate, probably, of the thiete structure.