[F:1][C:2]1[CH:10]=[C:9]([C:11]([F:17])([F:16])[C:12]([F:15])([F:14])[F:13])[CH:8]=[CH:7][C:3]=1[C:4](O)=[O:5].S(Cl)([Cl:20])=O>>[F:1][C:2]1[CH:10]=[C:9]([C:11]([F:17])([F:16])[C:12]([F:15])([F:14])[F:13])[CH:8]=[CH:7][C:3]=1[C:4]([Cl:20])=[O:5]To 2-fluoro-4-(1,1,2,2,2-pentafluoroethyl)benzoic acid (1 g, 3.87 mmol) was added thionyl chloride (3.67 mL, 50.36 mmol) and the reaction was stirred at 60° C. for 22 hours. Excess thionyl chloride was removed in vacuo to yield 2-fluoro-4-(1,1,2,2,2-pentafluoroethyl)benzoyl chloride (1 g, 93%) a s a viscous yellow liquid.
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