反应详情

温度

10 °C

1N aqueous hydrochloric acid solution (87 cc) is added in the course of 3 minutes to a solution, maintained under reflux, of ethyl 2-dimethylamino-5-cyano-5-phenyl-2,4-pentadienoate (21.3 g) in ethanol (27 cc). The mixture is cooled to a temperature of approximately 10° C. and the precipitate obtained is filtered off, washed with ethanol (15 cc) and dried. Ethyl 2-hydroxy-5-cyano-5-phenyl-2,4-pentadienoate (12.1 g), m.p. 189° C., is thereby obtained.

1. temperaturemaintained
2. customthe precipitate obtained
3. filtrationis filtered off
4. washwashed with ethanol (15 cc)
5. customdried