[F:1][C:2]1[CH:7]=[CH:6][C:5]([CH2:8][C:9]([OH:11])=[O:10])=[CH:4][C:3]=1[O:12][CH3:13].[Br:14]Br.O>CC(O)=O>[Br:14][C:6]1[CH:7]=[C:2]([F:1])[C:3]([O:12][CH3:13])=[CH:4][C:5]=1[CH2:8][C:9]([OH:11])=[O:10]To a solution of 4-fluoro-3-methoxyphenylacetic acid (5.0 g, 27.1 mmol) in AcOH (20 ml) was added bromine (1.5 ml, 29.8 mmol). The mixture was stirred at room temperature for three hours. Water was added and the precipitate was isolated by filtration. The white solid was washed with water and dried to give (2-bromo-4-fluoro-5-methoxy-phenyl)-acetic acid (6.21 g, 87%).
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