2,3-Difluorobenzoyl chloride → 3-Chloro-2-hydroxy-4-methoxy-2',3'-difluorobenzophenone

Participants

Reaction Steps

To a mixture of 4 g of 2-chlororesorcinol dimethyl ether and 3.7 g of 2,3-difluorobenzoyl chloride in 60 ml of 1,2-dichloroethane at 5° C., 3.06 g of AlCl3 is added in portions. The mixture is allowed to warm to room temperature and then refluxed for 30 minutes. The reaction mixture is poured into concentrated HCl-ice and is permitted to stand about 72 hours. The aqueous layer is extracted with additional organic solvent, dried over Na2SO4 and evaporated to give 3-chloro-2-hydroxy-4-methoxy-2',3'-difluorobenzophenone, mp 161°-162° C.

Provenance & Evidence