反应详情

24 g of 2,3-bis(acetyloxy)benzoic acid was suspended in 100 ml of dichloromethane and, at -10° C., 23 g of phosphorous pentachloride was added. The hydrogen chloride gas that formed was removed The resulting clear solution was then evaporated in an oil-pump vacuum yielding a brown honey. This was dissolved in 300 ml of petroleum ether and filtered over active carbon. After distilling off the solvent, the title compound was obtained in the form of white crystals (25.1 g); melting point 97°-99° C. (dec.)