反应详情

温度

100 °C

1.86 g (9.16 mmol) of 1-(3,4-dimethylphenyl)-3-methyl-3-pyrazolin-5-one was dissolved in 3.6 ml of dry dimethylformamide, and 1.02 ml (11.0 mmol) of phosphorus oxychloride was added gradually under cooling with ice at 20° C. or below. After the addition, the mixture was heated at 100° C. for 2 hours, cooled to room temperature and poured into 30 ml of ice-cold water. Then, the mixture was washed with 10 ml of water and 10 ml of dimethylformamide. The mixed solution was stirred for 18 hours, and the precipitated solid was collected by filtration, washed with 20 ml of water and dried to obtain 1.03 g of the desired product as a pale brown solid (yield 49%).

1. temperatureunder cooling with ice at 20° C. or below
2. additionAfter the addition
3. temperaturecooled to room temperature
4. washThen, the mixture was washed with 10 ml of water and 10 ml of dimethylformamide
5. filtrationthe precipitated solid was collected by filtration
6. washwashed with 20 ml of water
7. customdried