反应详情

A mixture of 19.5 g (0.1 mol) of 3,4-dichlorobenzylchloride and 7.6 g (0.1 mol) of thiourea in 50 ml of water are heated under reflux for 30 minutes with stirring, and then a solution of 16 g (0.4 mol) of NaOH in 25 ml of water is run in at 60°-70° C.; the mixture is heated under reflux for 15 minutes, a solution of 15 g (0.15 mol) of chloroacetic acid, 7 g of sodium carbonate and 50 ml of water is run in at 60°-70° C., and the mixture is maintained under reflux for 1 hour. The mixture is acidified cold with concentrated HCl, extracted with ether, and the extract is washed with water, dried and evaporated. The residue is taken up in petroleum ether and filtered off. 21 g of the stated product are obtained (yield: 83%) melting point: 63°-64° C.

1. temperatureare heated
2. temperatureunder reflux for 30 minutes
3. customis run in at 60°-70° C.
4. temperaturethe mixture is heated
5. temperatureunder reflux for 15 minutes
6. customis run in at 60°-70° C.
7. temperaturethe mixture is maintained
8. temperatureunder reflux for 1 hour
9. extractionextracted with ether
10. washthe extract is washed with water
11. customdried
12. customevaporated
13. filtrationfiltered off