Dimethylformamide → 5-chloro-1,3-diphenyl-1H-pyrazole-4-carbaldehyde
반응식
O=P(Cl)(Cl)[Cl:3].[C:6]1([N:12]2[C:16](=O)[CH2:15][C:14]([C:18]3[CH:23]=[CH:22][CH:21]=[CH:20][CH:19]=3)=[N:13]2)[CH:11]=[CH:10][CH:9]=[CH:8][CH:7]=1.[OH-].[Na+].CN(C)[CH:28]=[O:29]>>[Cl:3][C:16]1[N:12]([C:6]2[CH:11]=[CH:10][CH:9]=[CH:8][CH:7]=2)[N:13]=[C:14]([C:18]2[CH:23]=[CH:22][CH:21]=[CH:20][CH:19]=2)[C:15]=1[CH:28]=[O:29]참가 물질
5
실험 절차
At 5° to 10° 97.3 g of phosphorus oxytrichloride are added dropwise to 92.7 g of dimethylformamide and the mixture is stirred for completion of the complex formation for 30 minutes at room temperature. Following this 30 g of 1,3-diphenyl-2-pyrazoline-5-one are added and while stirring heating is carried out for 1 hour at 55°C and for 20 hours at 70°. The product is poured on to approximately 600 g of ice neutralised with concentrated sodium hydroxide solution to pH 3-4, vacuum filtered and washed with water. 5-Chloro-1,3-diphenyl-pyrazole-4-carboxaldehyde is obtained with a yield of 93 %; F 109°-110° (from petroleum ether).