反应详情

温度

20 °C

Phosphorus pentachloride (83.3 g; 0.40 mol) is introduced into a solution of cyanoacetic acid (34.0 g; 0.40 mol) in 1,2 l of dichloromethane and the mixture is heated under reflux for 30 minutes. 4-Trifluoromethylaniline (41.0 g, 0.26 mol) is then introduced into said mixture within about 10 minutes and the reaction mixture is heated under reflux for 2 hours. After cooling to 20° C., the reaction mixture is treated with 500 ml of water and then stirred for 30 minutes. The aqueous phase is neutralized with sodium carbonate and the precipitate is filtered off with suction. The filter cake is washed with water and dried. 55.2 g of N-(4-trifluoromethylphenyl)cyanoacetamide are thus obtained in crystalline form. Melting point: 194°-195.5° C.

1. temperaturethe mixture is heated
2. temperatureunder reflux for 30 minutes
3. customwithin about 10 minutes
4. temperaturethe reaction mixture is heated
5. temperatureunder reflux for 2 hours
6. filtrationthe precipitate is filtered off with suction
7. washThe filter cake is washed with water
8. customdried