Organic fluorine compounds containing a trifluoromethyl group have lately attracted considerable attention because of their biological activities. 2 In previous papers, we reported the triflu~ romethylation~ of aromatic halides with trifluoromethyl copper and the trifluor~ propylation~ of aromatic compounds by the Friedel-Crafts reaction of trifluoropropene in the presence of HBFl as a catalyst. In (1 j A part of this work was ...