4-bromomethylperfluorobiphenyl (3.68 g, 9 mmol) and sodium trifluoromethane sulfinate (1.69 g, 10.8 mmol) were dissolved in propionitrile (30 mL), and the resultant solution was subjected to heating under reflux for 12 hours. After the reaction, the solution was cooled to room temperature, and water was added for extraction with ethyl acetate. The organic phase was dried with magnesium sulfate, filtrated, and the solvent was removed under reduced pressure. The crude product was purified by silica gel column chromatography (hexane-ethyl acetate=20:1 to 8:1 to 1:1), and the aimed {4-(pentafluorophenyl)-2,3,5,6-tetrafluorophenyl}(triflyl)methane (3.91 g, 8.46 mmol, 94% yield) was isolated. 1H NMR (CDCl3, 300 MHz) δ 4.75 (s, 2H, CH2Tf); 19F NMR (CDCl3, 282 MHz) δ−78.24 (s, 3F, CF3), −136.82 to −136.62 (m, 1F), −137.72 (dd, J=10.7, 18.3 Hz, 2F), −138.84 (dd, J=10.7, 18.3 Hz, 2F), −149.69 (t, J=21.3 Hz, 1F), −160.63 (dt, J=6.1, 21.3 Hz, 2F).
