Jp. Begue et al., HALOGENATION OF 1-TRIFLUOROMETHYL ENAMINES - A NEW AND EFFICIENT SYNTHESIS OF ALPHA-BROMO-TRIFLUOROMETHYL AND ALPHA-IODO-TRIFLUOROMETHYL KETONES, Journal of fluorine chemistry, 80(1), 1996, pp. 17-20
Treatment of the 1-trifluoromethyl enamines 1a-d with bromine or iodin
e results in the formation of the corresponding iminium salts. Treatme
nt of any of these salts with methanol results in the formation of the
corresponding alpha-halo-trifluoromethyl ketones.