Sulfonyl hydrazides recently received much attention as reagents for the introduction of sulfur-containing functional groups into organic compounds, because both sulfonyl and sulfenyl sources could be generated by the oxidation and decomposition of the sulfonyl hydrazides, respectively. However, the transformations of sulfonyl hydrazides into thiosulfonates, which could be produced by the reaction between sulfonyl and sulfenyl sources, have been less investigated. In this manuscript, we describe CuCl₂-promoted selective synthesis of thiosulfonates from sulfonyl hydrazides. A variety of thiosulfonates were produced in moderate to good yields. The mechanism involving radical intermediates such as sulfonyl radical and thiyl radical was proposed on the basis of the previously reported references and mechanistic investigations. In addition, quantum chemical simulations revealed that Cu-promoted decomposition of sulfonyl hydrazides is thermodynamically viable in the developed conditions.

磺酰肼作为将含硫官能团引入有机化合物的试剂最近受到了广泛的关注，因为磺酰肼的氧化和分解分别可以产生磺酰和亚磺酰基源。然而，由磺酰基和亚磺酰基源之间的反应产生的磺酰肼向硫代磺酸盐的转化已经很少研究。在本手稿中，我们描述了CuCl ₂促进了磺酰肼选择性合成硫代磺酸盐。各种硫代磺酸盐的产率中等至良好。在先前报道的参考文献和机理研究的基础上，提出了涉及自由基中间体如磺酰基和巯基的机理。此外，量子化学模拟显示，在发达条件下，Cu促进的磺酰肼的分解在热力学上是可行的。