Phthalic Anhydride → 2-(2-Methoxybenzoyl)benzoic acid

Participants

Reaction Conditions

Reaction Steps

A solution in tetrahydrofuran (17 ml) of a Grignard's reagent prepared from magnesium (120 mg, 5.1 mmol) and 2-bromoanisole (0.55 ml, 4.4 mmol) was added dropwise to a solution of phthalic anhydride (500 mg, 3.4 mmol) in tetrahydrofuran (12 ml) in an atmosphere of nitrogen at −70° C. over a period of 10 minutes. The reaction mixture was stirred at −70° C. for 2.5 hours, and aqueous saturated ammonium chloride solution was added. The mixture was extracted with ethyl acetate, and the organic layer was washed with aqueous saturated sodium chloride solution, dried and concentrated under reduced pressure to obtain crude 2-(2-methoxybenzoyl)benzoic acid (770 mg, yield: 90%).

Provenance & Evidence