Réaction #63139

Équation de réaction

2,3,4-trichlorobenzotrifluoride

hydrazine hydrate

→

2,3-dichloro-4-trifluoromethyl-phenylhydrazine

Rendement 79.4%

Solvants

pyridine

Conditions de réaction

Traitement

1. 1
   Températurethe mixture is then heated to the reflux temperture for 12 hours
2. 2
   workup.DISTILLATIONThereafter, 90% of the pyridine is distilled off
3. 3
   FiltrationThe crystalline product is filtered off under suction
4. 4
   Lavagewashed with a little water
5. 5
   Autredried

Mode opératoire

100 g of 2,3,4-trichlorobenzotrifluoride are initially introduced, 200 ml of pyridine are added, followed by 100 g of hydrazine hydrate and the mixture is then heated to the reflux temperture for 12 hours. Thereafter, 90% of the pyridine is distilled off and the remaining residue is stirred into 250 ml of water. The crystalline product is filtered off under suction, washed with a little water and dried. 78 g of 2,3-dichloro-4-trifluoromethyl-phenylhydrazine having a melting point of 79° to 80° C. are obtained.

Source