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Under an argon atmosphere, 132 g of magnesium were dispersed in 500 mL of ether. A solution of 142 g of 2-(3-bromophenyl) naphthalene in 500 mL of ether was added to the dispersion, and then the mixture was stirred at room temperature for 1 hour. A solution of 74 g of phthalic anhydride in 150 mL of benzene was added to the mixture, and then the resultant reaction solution was stirred for 3 hours under reflux. After having been cooled to room temperature, the reaction solution was poured into ice water, and then 1 L of 10% hydrochloric acid was added to the mixture. The organic layer was separated and extracted with an aqueous solution of potassium carbonate. The alkaline extract was acidified, and then the resultant solid was washed with boiling water. The resultant crude product was recrystallized with acetic acid. Thus, 121 g of 2-(3-phenylbenzoyl)benzoic acid were obtained (in 69% yield).

1. customthe resultant reaction solution
2. stirringwas stirred for 3 hours
3. temperatureunder reflux
4. temperatureAfter having been cooled to room temperature
5. customThe organic layer was separated
6. extractionextracted with an aqueous solution of potassium carbonate
7. extractionThe alkaline extract
8. washthe resultant solid was washed with boiling water
9. customThe resultant crude product was recrystallized with acetic acid