Hydrochloric Acid → 2,6-Dichloro-4-methylbenzophenone

Participants

Reaction Conditions

Reaction Steps

An ambient temperature solution of 2,6-dichloro-4-methylbenzoyl chloride (5.5 g, 25 mmol) in benzene (30 ml) was treated in portions with aluminum chloride (3.45 g, 25.9 mmol). When hydrogen chloride evolution ceased, the mixture was heated at 80° C. for 15 hours. The mixture was cooled, quenched by addition of ice and concentrated hydrochloric acid (5 ml), and diluted with diethyl ether (50 ml). The layers were separated and the organic phase washed with water, dried over anhydrous magnesium sulfate, and evaporated to dryness under vacuum. The semisolid residue was chromatographed on a column of silica gel (300 g) eluted with 4:1 (v/v) hexanedichloromethane to provide 4.60 g (69%) 2,6-dichloro-4-methylbenzophenone, m.p. 75.5°-76.5° C.

Provenance & Evidence