反应详情

Into 40 ml of 20% aqueous solution of sulfuric acid was dissolved 20 g of N-phenylpyrrolidine. To the solution was added 7.2 g of pyruvic acid and the mixture was heated with reflux for 16 hours. The reaction mixture was, after cooled, diluted with 300 ml of water and adjusted to pH 6 with addition of 20% aqueous solution of sodium hydroxide. The precipitated crystal was collected by filtration. The crystal was recrystallized from benzene to obtain 18.5 g (yielded 75%) of 2,2-bis(4-pyrrolidinophenyl)propionic acid as white crystal, having a melting point of 174°~176° C.

1. temperaturethe mixture was heated
2. temperaturewith reflux for 16 hours
3. temperatureafter cooled
4. filtrationThe precipitated crystal was collected by filtration
5. customThe crystal was recrystallized from benzene