Hydrochloric Acid → [4-(4-Benzoylphenyl)phenyl](phenyl)methanone

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The photoinitiator dibenzoyl biphenyl was prepared by placing 200 mL nitrobenzene, 38.5 g (0.25 mole) biphenyl, and 140.6 g (1.00 mole) benzoyl chloride into a 1 liter 3-necked flask equipped with a water condenser. While stirring, 160 g (1.2 mole) aluminum trichloride was added slowly over a period of about 30 minutes. During the reaction, the temperature increased from 30° C. to 55° C. The color changed from yellowish to light brown, then reddish. The flask was kept in a water bath at a temperature of 55° C. to 60° C. for 3 hours while stirring. The reaction mixture was then cooled to 35° C. The reaction mixture was poured into 1.2 L of 8% HCl solution with vigorous stirring. The organic layer was separated and poured into a blender and 500 mL n-hexane was added. The mixture was vigorously stirred for 5 minutes and then filtered. The solid was washed with n-hexane. The thus-produced dibenzoyl biphenyl was dried and recrystalized twice in chloroform.

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