Iodine-Promoted Disproportionate Coupling Reaction of Arylsulfonyl Hydrazides: A Simple and Green Access to Thiosulfonates

An environmentally friendly iodine-promoted disproportionate coupling reaction of arylsulfonyl hydrazides is reported. This strategy can synthesize thiosulfonates with medium to excellent yields, and features a green system, wide applicability of substrates, and easy availability of raw materials. The preliminary mechanistic study reveals that iodine plays an important role in the radical reaction process.