Radial Type Ring Opening of Sulfonium Salts with Dichalcogenides by Visible Light and Copper Catalysis.

Herein, a copper-catalyzed, blue-light-induced free radical type ring opening of sulfonium salts with dichalcogenides has been initially developed. The developed method features an inexpensive copper catalyst and a broad substrate scope, affording practical access to alkyl chalcogenides in high yields. This reaction presents a novel ring-opening model of sulfonium salts, which breaks the limitation that only the nucleophilic ring-opening reaction could form C-heteroatom bonds and C-C bonds.