[Cl:1][C:2]1[CH:7]=[CH:6][C:5]([CH2:8][C:9]([OH:11])=[O:10])=[C:4]([O:12]C)[CH:3]=1.Br>C(O)(=O)C>[Cl:1][C:2]1[CH:7]=[CH:6][C:5]([CH2:8][C:9]([OH:11])=[O:10])=[C:4]([OH:12])[CH:3]=14-chloro-2-methoxy-benzeneacetic acid (1.4 g), HBr (25 ml), acetic acid (5 ml) were refluxed for 48 h then evaporated under reduced pressure. The residue was azeotroped with toluene and triturated with diethyl ether and isohexane. Yield 0.56 g.
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