反应详情

A solution of 200 g of 2-chloro-3-trifluoromethylpyridine in 500 ml of ethanol and 300 ml of hydrazine hydrate is heated under reflux for 6 hours. The solution is then concentrated in vacuo and, after cooling, the crystalline residue is then taken up with water, filtered off, washed with water and dried to give 145 g of 3-trifluoromethyl-2-hydrazinopyridine in the form of crystals melting at 72° C.

1. temperatureunder reflux for 6 hours
2. concentrationThe solution is then concentrated in vacuo
3. temperatureafter cooling
4. filtrationfiltered off
5. washwashed with water
6. customdried