Leveraging Propargyl Sulfides as Radical Trappers for the Synthesis of Sulfonyl Allenes

This work showcases a novel visible‐light mediated allenylation protocol employing propargyl sulfides as a pioneering radical trapping methodology. A diverse array of substituted sulfonyl allenes were successfully synthesized under mild conditions with commendable levels of chemo‐ and regio‐selectivity. Mechanistically, this process entails the formation of sulfonyl radicals, their subsequent addition to alkynes, the subsequent elimination of S‐centered radicals, and Cl‐atom abstraction, thereby facilitating the propagation of this radical chain reaction.