反应详情

温度

92.5 °C

3.5 kg of p-anisidine are added to 6.25 kg of diethyl ethoxymethylenemalonate at 14° C., over 85 minutes without cooling of the reaction mass. At the end of addition, the temperature has reached 59° C. The temperature is kept at 59° C. for 30 minutes, and the reaction medium is then heated to 90-95° C. and kept at this temperature for 1 hour. The ethanol formed is then removed by distillation at atmospheric pressure and then under 250 mbar. After cooling to 45° C., 8.4 kg of diethyl 2-[(4-methoxyphenylamino)methylene]malonate are recovered in the form of a brown viscous oil, with a quantitative yield.

1. temperaturewithout cooling of the reaction mass
2. additionAt the end of addition
3. customhas reached 59° C
4. waitkept at this temperature for 1 hour
5. customis then removed by distillation at atmospheric pressure
6. temperatureAfter cooling to 45° C.
7. custom8.4 kg of diethyl 2-[(4-methoxyphenylamino)methylene]malonate are recovered in the form of a brown viscous oil, with a quantitative yield