[Cl:1][C:2]1[CH:3]=[CH:4][C:5]([I:11])=[C:6]([CH:10]=1)[C:7](O)=[O:8].O=S(Cl)[Cl:14]>C1(C)C=CC=CC=1>[Cl:1][C:2]1[CH:3]=[CH:4][C:5]([I:11])=[C:6]([CH:10]=1)[C:7]([Cl:14])=[O:8]To a solution of 5-chloro-2-iodobenzoic acid (3.0 g, 10.6 mmol) in toluene (150 mL), SOCl2 (7.75 mL, 106 mmol) was added and the mixture was heated at 100° C. for 3 hours. The solvent was concentrated in vacuum and the residue was co-evaporated from toluene twice to give the title compound as a grey solid. Yield (3.2 g, 100%)
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