Trifluoromethyl-Substituted Sulfonium Ylide: Rh-Catalyzed Carbenoid Addition to Trifluoromethylthioether

A highly efficient Rh-catalyzed carbenoid addition to trifluoro­methyl­thioether for the formation of trifluoromethyl-substituted sulfonium ylide is described. The trifluoro­methyl-substituted sulfonium ylide can act as an electrophilic trifluoro­methylation reagent, as demonstrated by trifluoro­methylation of β-ketoesters and aryl iodides.