[Cl:1][C:2]1[CH:7]=[CH:6][CH:5]=[C:4]([I:8])[CH:3]=1.[C:9]([O:12]O)(=[O:11])[CH3:10]>>[C:9]([O-:12])(=[O:11])[CH3:10].[C:9]([O-:12])(=[O:11])[CH3:10].[Cl:1][C:2]1[CH:3]=[C:4]([I+2:8])[CH:5]=[CH:6][CH:7]=11-Chloro-3-iodobenzene (5.0 g, 21 mmol) was stirred at 30° C. Peracetic acid (40%, 8.35 mL, 50.3 mmol) was added drop wise to the solution and the reaction was allowed to stir for 12 h. The white solid that formed was filtered, washed 1 time with 10% acetic acid, and 3 times with hexanes and dried in vacuo to afford the title product (27.5 g, 92%) as a white solid.
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