• Convenient trifluoromethylating agent. In combination with CuI, KF and DMF, trifluoromethylation of aryl and vinyl halides is achieved via the generation of trifluoromethylcopper: Tetrahedron Lett., 32, 7689 (1991); J. Fluorine Chem., 55, 225 (1992). Similarly, nitroaryl chlorides undergo substitution to give the trifluoromethyl derivatives in high yield: J. Fluorine Chem., 66, 167 (1994).