Rhodium(III)-Catalyzed Regioselective C-H Alkenylation of Phenylphosphine Sulfides

The regioselective alkenylation at the ortho position of phenylphosphine sulfides using alkenes proceeds efficiently in the presence of a cationic Cp*-rhodium(III) catalyst and an appropriate oxidant. A similar rhodium catalyst also promotes the redox-neutral coupling of the phosphine sulfides with alkynes to afford ortho-alkenylated products.