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0 °C

40 ml of N-phenyl-1,2-phenylenediamine (7.36 g, 40 mmol) was charged in a 250 ml round bottle, 10 ml of triethylamine was then added, and the mixture was cooled to 0° C. Benzoyl chloride (5.6 g, 40 mmol) was dissolved in 40 ml of dichloromethane and then slowly added to the 250 ml round bottle. The reaction was conducted under a nitrogen atmosphere for 6 hours. After the reaction was complete, ether was added to form precipitation. The solid product was collected by filtration, washed with ether several times, and heated under reduced pressure to form 1,2-diphenyl-1H-benzoimidazole (yield=7.56 g, 70%).

1. additionwas then added
2. additionslowly added to the 250 ml round bottle
3. customto form
4. customprecipitation
5. filtrationThe solid product was collected by filtration
6. washwashed with ether several times
7. temperatureheated under reduced pressure