Since the pioneer work of McLoughlin' and Kobayashi,2 trifluoromethylcopper has been recognized as a convenient reagent for coupling with aromatic and heteroaromatic halides. Various methods have been proposed to provide access to this species, including reaction of CF3P or CF2Br23 with metallic copper, pyrolysis of copper trifluoroacetate,4 CuF-induced decomposition of CF3SiR35, and metathesis reactions from cadmium,b or mercury7 species. Little work ...