[F:1][C:2]1[CH:3]=[C:4]([CH:8]=[C:9]([F:11])[CH:10]=1)[C:5](O)=[O:6].S(Cl)([Cl:14])=O>>[F:1][C:2]1[CH:3]=[C:4]([CH:8]=[C:9]([F:11])[CH:10]=1)[C:5]([Cl:14])=[O:6]1.63 g (10.00 mmol) 3,5-difluoro-benzoic acid were mixed with 20 mL thionyl chloride and boiled for 2 h. The reaction mixture was evaporated to dryness and coevaporated twice with toluene. The residue was reacted further as the crude product.
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