Hydrazine hydrate (1:1) → 2,3-Dichloro-4-trifluoromethyl-phenylhydrazine

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Reaction Steps

100 g (0.4 mol) of 2,3,4-trichlorobenzotrifluoride are initially introduced, 200 ml of pyridine and subsequently 100 g (2.0 mol) of hydrazine hydrate are added, and the mixture is then heated to the reflux temperature for 12 hours. 90% of the pyridine is then removed by distillation, and the residue remaining is stirred into 250 ml of water. The crystalline product is filtered off with suction, washed with some water and dried. 78 g (80% of theory) of 2,3-dichloro-4-trifluoromethyl-phenylhydrazine of melting point 79° to 80° C. are obtained.

Provenance & Evidence