反应详情

温度

70 °C

With stirring (20 rpm), a turbine dryer is charged at room temperature with 1007 parts by weight of anhydrous sodium sulfate, 222 parts by weight of biphenyl-4-carbaldehyde and 105 parts by weight of hydroxylammonium sulfate. Following evacuation to 13 mbar, the mixture is heated to 70° C. and stirred at this temperature for 3 hours. It is subsequently heated at 130° C., during which about 43 parts by weight of water are removed by distillation. After half an hour, the pressure is reduced to 4 mbar and the jacket temperature is raised successively to 170° C. over the course of 60-70 minutes, the product undergoing fractional distillation. 194 parts by weight of biphenyl-4-carbonitrile are obtained with an outstanding purity of ~98-99% (HPLC) and a melting point of 83°-85° C., along with 10 parts by weight of a less pure fraction.

1. stirringstirred at this temperature for 3 hours
2. customare removed by distillation
3. waitAfter half an hour
4. temperaturethe jacket temperature is raised successively to 170° C. over the course of 60-70 minutes
5. distillationdistillation