Dimethylformamide → (5-Bromo-2-chlorophenyl)(4-methoxyphenyl)methanone

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38.3 mL oxalyl chloride and 0.8 mL dimethylformamide are added to a mixture of 100 g 5-bromo-2-chloro-benzoic acid in 500 mL dichloromethane. The reaction mixture is stirred for 14 h, then filtered and separated from all volatile constituents in a rotary evaporator. The residue is dissolved in 150 mL dichloromethane, the resultant solution is cooled to −5° C., and 46.5 g anisole are added. Then 51.5 g aluminum trichloride are added batchwise so that the temperature does not exceed 5° C. The solution is stirred for 1 h at 1 to 5° C. and then poured onto crushed ice. The organic phase is separated off, and the aqueous phase is extracted with dichloromethane. The combined organic phases are washed with 1 M hydrochloric acid, twice with 1 M sodium hydroxide solution and with brine. Then the organic phase is dried over sodium sulfate, the solvent is removed and the residue is recrystallized from ethanol.

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