反应详情

470 g (1.87 mol) of 3,5-dichloro-2,4-difluorobenzotrifluoride are initially introduced in 1000 ml of ethanol, 142 g (2.84 mol) of hydrazine hydrate are metered in, and the mixture is subsequently heated to reflux for 3 hours. The solvent is then removed by distillation under reduced pressure, and the residue is stirred into 1000 ml of cold water. After 30 minutes, the solid product is filtered off with suction and dried in a circulation dryer. 445 g (90% of theory) of 2,6-dichloro-3-fluoro-4-trifluoromethyl-phenylhydrazine of melting point 50° to 51° C. are obtained.

1. temperatureis subsequently heated
2. temperatureto reflux for 3 hours
3. customThe solvent is then removed by distillation under reduced pressure
4. filtrationthe solid product is filtered off with suction
5. customdried in a circulation dryer