Kiyoshi Kanie, Yoichiro Tanaka, Masaki Shimizu, Manabu Kuroboshi and Tamejiro Hiyama
The reagent consisting of 70% HF–py (py = pyridine) and a halonium oxidant converts R–OCS2Me into either R–OCF3 (R = primary) or R–F (R = secondary, tertiary or benzylic) whereas the 50% HF–py system converts R–OCS2Me (R = secondary) into R–OCF3.