[Cl-].[Al+3].[Cl-].[Cl-].[C:5]1([O:13]C)[C:6](=[CH:9][CH:10]=[CH:11][CH:12]=1)[O:7][CH3:8].[Cl-].[CH3:16][O:17][C:18](=[O:28])[C:19]1[CH:27]=[CH:26][CH:25]=[C:21]([C:22](O)=[O:23])[CH:20]=1.Cl>ClCCl>[CH3:16][O:17][C:18](=[O:28])[C:19]1[CH:27]=[CH:26][CH:25]=[C:21]([C:22](=[O:23])[C:10]2[CH:11]=[CH:12][C:5]([OH:13])=[C:6]([O:7][CH3:8])[CH:9]=2)[CH:20]=114.8g of aluminum chloride and 5g of veratrole are added to a solution of 7.34g of isophthalic acid monomethyl ester chloride in 160 ml of dichloromethane under ice cooling. The reaction mixture is refluxed for 8 hours, poured on ice water, acidified with 2 n of hydrochloric acid and shaken out with dichloromethane. The organic phase is dried on sodium sulfate, concentrated by evaporation and the residue is chromatographed on silica gel with hexane/ethyl acetate=8/2. 3.5g of 3-(4-hydroxy-3-methoxybenzoyl)-benzoic acid methyl ester of melting point of 133°-134° C. is obtained.
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