反应详情

3 g of 4-cyanobenzoic acid 1 (20.4 mmol) were dissolved in 40 mL of pyridine and 2.1 mL of triethylamine (20.4 mmol) were added. Dry hydrogen sulphide was passed through the solution in a steady steam for 4 h. The mixture was then poured into water and the solid collected by filtration. Recrystallization from petroleum ether furnished 2.51 g of the pure compound 2 (68% yield).

1. filtrationthe solid collected by filtration
2. customRecrystallization from petroleum ether