反应详情

470 g of 3,5-dichloro-2,4-difluorobenzotrifluoride in 1000 ml of ethanol are initially introduced, and 142 g of hydrazine hydrate are metered in, and the mixture is then heated under reflux for 3 hours. Thereafter, the solvent is distilled off under reduced pressure and the residue is stirred into 1 l of cold water. After 30 minutes, the mixture is filtered under suction and the solid product is dried in a through-circulation oven. 445 g of 2,6-dichloro-3-fluoro-4-trifluoromethyl-phenylhydrazine having a melting point of 50° to 51° C. are obtained.

1. temperatureis then heated
2. temperatureunder reflux for 3 hours
3. distillationThereafter, the solvent is distilled off under reduced pressure
4. filtrationthe mixture is filtered under suction
5. customthe solid product is dried in a through-circulation oven