反应详情

To a 100 ml flask were added 2.7 g of benzoyl hydrazine, a solution of 1.2 g potassium hydroxide in ethanol (20 ml) and 3 g of carbon disulfide. The mixture was heated under reflux for 6 hours with stirring. The solvent was distilled under reduced pressure and water was added to dissolve the solid. The pH was adjusted to 6-7 with 10% hydrochloric acid and a lot of solid was precipitated, which was filtrated, and recrystallized with anhydrous ethanol to give 5-phenyl-2-mercapto-1,3,4-oxadiazole. MP: 212-214° C.

1. temperatureThe mixture was heated
2. temperatureunder reflux for 6 hours
3. distillationThe solvent was distilled under reduced pressure and water
4. additionwas added
5. dissolutionto dissolve the solid
6. customa lot of solid was precipitated
7. filtrationwhich was filtrated
8. customrecrystallized with anhydrous ethanol