[CH3:1][C:2]1[CH:14]=[CH:13][CH:12]=[CH:11][C:3]=1[C:4]([C:6]([O:8][CH2:9][CH3:10])=[O:7])=[O:5].[Br:15]N1C(=O)CCC1=O.C(OOC(=O)C1C=CC=CC=1)(=O)C1C=CC=CC=1.CCCCCC.C(OCC)(=O)C>C(Cl)(Cl)(Cl)Cl>[Br:15][CH2:1][C:2]1[CH:14]=[CH:13][CH:12]=[CH:11][C:3]=1[C:4]([C:6]([O:8][CH2:9][CH3:10])=[O:7])=[O:5]To a solution of ethyl 2-methylbenzoylformate (10 g) in carbon tetrachloride (200 ml) were added N-bromosuccinimide (10 g) and 25%-hydrous benzoyl peroxide (1 g) and the mixture was heated under reflux for 2 hours. The reaction mixture was cooled with ice-water and filtered through a pad of Celite. The filtrate was concentrated under reduced pressure to give a yellow oil. The oil was subjected to silica gel column chromatography (eluent: hexane/ethyl acetate=20/1) to give the desired ethyl 2-(bromomethyl)benzoylformate (6.1 g, yield: 43%).
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