Dimethylformamide → 3-Phenylbenzaldehyde

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To a mixture of 3-bromobiphenyl (0.50 mL, 3.0 mmol) and tetrahydrofuran (8 mL) was added n-butyl lithium (2.6 mL, 1.5 M n-hexane solution, 3.9 mmol) under nitrogen atmosphere at −78° C., which was stirred for 20 minutes at that temperature. N,N-dimethylformamide (0.35 mL, 4.5 mmol) was added to the reaction mixture at the same temperature, and the temperature was gradually raised to 0° C. Water was added to the reaction mixture, which was then extracted with ethyl acetate. The organic layer was washed with saturated aqueous sodium chloride, and was concentrated under a reduced pressure. The residue was purified by silica gel column chromatography (heptane:ethyl acetate=6:1) to obtain the title compound (430 mg, 79%).

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