[Br:1][CH2:2][C:3]1[CH:4]=[C:5]([CH:9]=[CH:10][CH:11]=1)[C:6](O)=[O:7].C(Cl)(=O)C([Cl:15])=O>CN(C)C=O.ClCCl>[Br:1][CH2:2][C:3]1[CH:4]=[C:5]([CH:9]=[CH:10][CH:11]=1)[C:6]([Cl:15])=[O:7]a solution of 12 g of m-bromomethylbenzoic acid 10.62 g of oxalyl chloride, 100 ml of dichloromethane and 5 drops of dimethylformamide was allowed to stand 48 hours and then evaporated. Hexane and ether were added, the mixture evaporated and the residue distilled on a Kugelroher, giving 12.5 g of m-bromomethylbenzoyl chloride as a yellow liquid.
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