[Br:1]Br.[C:3]([C:7]1[CH:8]=[C:9]([CH:14]=[CH:15][CH:16]=1)[C:10]([O:12][CH3:13])=[O:11])(=[O:6])[CH2:4][CH3:5]>C(OCC)C>[Br:1][CH:4]([CH3:5])[C:3]([C:7]1[CH:8]=[C:9]([CH:14]=[CH:15][CH:16]=1)[C:10]([O:12][CH3:13])=[O:11])=[O:6]Bromine (4.6 ml) was dropped at 20-30° C. over 20 min. to a solution of methyl 3-propionyl-benzoate (17.24 g) in diethyl ether (0.15 L). Stirring was continued for 10 min. and the reaction mixture was then evaporated in vacuum to give methyl 3-(2-bromo-propionyl)-benzoate (25.5 g) as a yellow oil.
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