Copper‐Mediated Trifluoromethylation of Terminal Alkynes by S‐(Trifluoromethyl)diarylsulfonium Salt

Abstract The copper‐mediated trifluoromethylation of terminal alkynes with S ‐(trifluoromethyl)diarylsulfonium salt has been carefully investigated. The reactions proceeded smoothly to afford trifluoromethylated acetylenes in moderate to good yields. This approach is a convenient method to synthesize a variety of functional trifluoromethylated acetylenes.