[Cl-].[Al+3].[Cl-].[Cl-].[Cl:5][C:6]1[CH:11]=[CH:10][C:9]([CH2:12][C:13]([C:15]2[CH:20]=[CH:19][C:18]([O:21]C)=[CH:17][CH:16]=2)=[O:14])=[CH:8][CH:7]=1.Cl.C(OCC)(=O)C>C1(C)C=CC=CC=1>[Cl:5][C:6]1[CH:11]=[CH:10][C:9]([CH2:12][C:13]([C:15]2[CH:16]=[CH:17][C:18]([OH:21])=[CH:19][CH:20]=2)=[O:14])=[CH:8][CH:7]=1Aluminum chloride (29.8 g, 0.223 mol) is added in small portions to a stirred solution of 2-(4-chlorophenyl)-1-(4-methoxyphenyl)ethanone (19.4 g, 0.074 mol) in toluene (300 ml). The mixture is heated to 60° C. and stirring is continued for 2 h. Dilute hydrochloric acid is added to the cooled mixture. Ethyl acetate is added to dissolve the product. The layers are separated and the aqueous phase is extracted with ethyl acetate. The combined organic phases are dried and the solvents are evaporated. The product is recrystallized from toluene. The yield is 17 g, 93%.
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