Methyl anisate → 4-Methoxy-3-(2-methyl-benzoyl)-benzoic acid methyl ester

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4-Methoxybenzoic acid methyl ester (5.00 g, 30.1 mmol) and 2-methylbenzoyl chloride (4.88 g, 31.6 mmol) were dissolved in chlorobenzene (10 ml), tin(IV) chloride (9.41 g, 36.1 mmol) was added cautiously, and the mixture was heated to 140° C. for 3 h. The addition of the acid chloride and tin tetrachloride was repeated twice, and the mixture subsequently heated to 140° C. for 3 h each time. The mixture was poured onto 300 ml of ice/water and extracted with DCM. The combined extracts were dried over magnesium sulfate, filtered and evaporated to dryness. The residue was purified by silica gel chromatography (HEP/EA gradient) and subsequently by RP HPLC (water/ACN gradient) to yield 200 mg of the title compound.

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