Water → 3-Cyano-1-(2,6-dichloro-4-trifluoromethylphenyl)-5-fluoromethyl-4-trifluoromethylthiopyrazole

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Dimethylaminosulfur trifluoride (2.27 mL) was added to a solution of 3-cyano-1-(2,6-dichloro-4-trifluoromethylphenyl)-5-hydroxymethyl-4-trifluoromethylthiopyrazole (2.9 g) in dichloromethane. After stirring for 3 hours, water was added followed by dichloromethane. The organic phase was washed with an aqueous solution of saturated sodium bicarbonate, dried over anhydrous magnesium sulfate, filtered and concentrated under reduced pressure to give a residue that was purified by chromatography (SiO2, heptane/EA) to afford the title compound as a white solid (2.45 g, 84%). 1H NMR: (400 MHz, CDCl3): 5.38 (d, J=47.5 Hz, 2H) and 7.83 (s, 2H). 19F NMR (376 MHz, CDCl3): −43.83 (s, 3F), −63.76 (s, 3F) and −84.12 (t, J=47.5 Hz, 1F).

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