Reactions of N-substituted 2-polyfluoroalkyl-4-quinolones and 8-aza-5, 7-dimethyl-2- polyfluoroalkylchromones with (trifluoromethyl) trimethylsilane proceed mainly as a 1, 4- nucleophilic trifluoromethylation to give N-substituted 2, 2-bis (polyfluoroalkyl)-2, 3-