Sulfonylation of aryl/alkyl halides with sulfur dioxide under photoinduced conditions

Abstract

The C-X bond dissociation of aryl/alkyl halides via electron transfer under ultraviolet or visible light irradiation has been developed rapidly. Among the methods accomplished, recent advances for the sulfonylation of aryl/alkyl halides with sulfur dioxide under photoinduced conditions are summarized in this report. The transformations usually proceed smoothly with the insertion of sulfur dioxide via radical processes under mild conditions. Under ultraviolet irradiation, no metal catalysts are needed for the photoinduced sulfonylation of aryl/alkyl halides with sulfur dioxide, while a photoredox catalyst is necessary for the sulfonylation of aryl/alkyl halides with sulfur dioxide under visible light irradiation. During the transformation, excellent chemoselectivity and stereoselectivity are observed for the final outcome.