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3,4-Dimethoxybenzophenone was prepared analogously to 3,4,3',4'-tetramethoxybenzophenone using veratrole (2 mL, 15 mmol), aluminum chloride (2.2 g, 16.5 mmol) and benzoyl chloride (1.8 mL, 15.5 mmol). The crude mixture was purified by flash column chromatography (silica gel, 3% ethyl acetate/methylene chloride) to yield 3.44 g (93%) of the product as a white solid: mp 99-100° C.; 1H NMR (CDCl3) δ 7.82-7.30(m, 7H), 6.95-6.85 (m, 1H), 3.96 (s, 3H), 3.94 (s, 3H); 13C NMR (CDCl3) δ 195.5, 153.0, 149.0, 138.2, 131.8, 130.2, 129.6, 128.1, 125.4, 112.1, 109.7, 56.0, 56.0; Anal. Calcd for C15H14O3. Theoretical: C, 74.36; H, 5.82. Found: C, 74.21; H, 6.01.

1. customThe crude mixture was purified by flash column chromatography (silica gel, 3% ethyl acetate/methylene chloride)