[F:1][C:2]([F:13])([F:12])[C:3]1[CH:11]=[CH:10][CH:9]=[CH:8][C:4]=1[C:5](O)=[O:6].S(Cl)([Cl:16])=O>>[F:1][C:2]([F:13])([F:12])[C:3]1[CH:11]=[CH:10][CH:9]=[CH:8][C:4]=1[C:5]([Cl:16])=[O:6]A solution of 2.0 g of o-trifluoromethylbenzoic acid in 21 ml of thionyl chloride is heated at reflux for 1 hour. The volatiles are evaporated in vacuo to give a residue which is concentrated from toluene three times and dried under vacuum to give 2.1 g of the desired product as a residue.
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