Dimethylformamide → (5-Bromo-2-chloro-phenyl)-(4-ethoxy-phenyl)-methanone

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Reaction Conditions

Reaction Steps

38.3 ml oxalyl chloride and 0.8 ml of dimethylformamide are added to a mixture of 100 g of 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 the rotary evaporator. The residue is dissolved in 150 ml dichloromethane, the solution is cooled to −5° C., and 46.5 g of anisole are added. Then 51.5 g of aluminum trichloride are added batchwise so that the temperature does not exceed 5° C. The solution is stirred for another 1 h at 1 to 5° C. and then poured onto crushed ice. The organic phase is separated, and the aqueous phase is extracted another three times with dichloromethane. The combined organic phases are washed with aqueous 1 M hydrochloric acid, twice with aqueous 1 M sodium hydroxide solution and with brine. Then the organic phase is dried, the solvent is removed and the residue is recrystallised in ethanol.

Provenance & Evidence