[Cl-].[Al+3].[Cl-].[Cl-].[Cl:5][C:6]1[C:11]([Cl:12])=[CH:10][CH:9]=[CH:8][C:7]=1[O:13][CH3:14].[O:15]1[C:19]2[CH:20]=[CH:21][CH:22]=[CH:23][C:18]=2[CH:17]=[C:16]1[C:24](Cl)=[O:25].Cl>C(Cl)Cl>[Cl:12][C:11]1[C:6]([Cl:5])=[C:7]([O:13][CH3:14])[CH:8]=[CH:9][C:10]=1[C:24]([C:16]1[O:15][C:19]2[CH:20]=[CH:21][CH:22]=[CH:23][C:18]=2[CH:17]=1)=[O:25]14 g (0.1 mole) of aluminium chloride are introduced little by little in a solution of 16 g (0.09 mole) of 2,3-dichloro-anisol and 16 g (0.09 mole) of 2-benzofurancarboxylic acid chloride in 200 ml of methylene chloride the mixture is taken up to reflux for 4 hours, then poured on crushed ice (300 g) and concentrated hydrochloric acid (10 ml); the precipitate is filtered off, washed with an aqueous solution of sodium hydroxide (10 N), then with water and dried. 22 g of 2-benzofuryl (2,3-dichloro-4-methoxy-phenyl) ketone are obtained. Melting point 148° C. after crystallization from ethylacetate.
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