[Br:1]Br.[F:3][C:4]1[C:9]([F:10])=[CH:8][CH:7]=[CH:6][C:5]=1[C:11](=[O:13])[CH3:12]>C(OCC)C>[Br:1][CH2:12][C:11]([C:5]1[CH:6]=[CH:7][CH:8]=[C:9]([F:10])[C:4]=1[F:3])=[O:13]Bromine (4.96 g, 31.1 mmol) was slowly added dropwise to a solution of 1-(2,3-difluorophenyl)ethanone (4.85 g, 31.1 mmol) in diethyl ether (100 ml), and the mixture was stirred at room temperature for 5 hours. The reaction mixture was distilled off under reduced pressure to give 7.29 g (99.9%) of the desired product as an oil.
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