In this work, we report a practical and convenient sulfonium salt-mediated alkyne difunctionalization reaction. This method uses inexpensive P4S10 as both the sulfur and phosphorus sources, providing an efficient approach for access to various Z-vinyl phosphorodithioates. Preliminary studies suggest that the reaction undergoes a nucleophilic addition to in situ generated alkynyl sulfonium salts and subsequently a demethylation process.
Xie et al. (2025) studied this question.