| 摘要 |
Purifying N-alkyl substituted pyrrolidone compounds containing at least one impurity comprising e.g. N-alkyl substituted 1,5-dihydro-pyrrol-2-one compounds (I), N-alkyl substituted 1,3-dihydro-pyrrol-2-one compounds (II), N-alkyl substituted 5-hydroxy-pyrrolidin-2-one compounds (III) and N-alkyl substituted pyrrolidin-2-one compounds (IV), comprises (a) providing a mixture containing at least one N-alkyl substituted pyrrolidone and (I)-(VII) in an amount of 1-20000 ppm, (b) hydrogenating the mixture obtained in step (a), and (c) distilling the mixture obtained in step (b). Purifying N-alkyl substituted pyrrolidone compounds containing at least one impurity comprising N-alkyl substituted 1,5-dihydro-pyrrol-2-one compounds of formula (I), N-alkyl substituted 1,3-dihydro-pyrrol-2-one compounds of formula (II), N-alkyl substituted 5-hydroxy-pyrrolidin-2-one compounds of formula (III), N-alkyl substituted pyrrolidin-2-one compounds of formula (IV), N-alkyl substituted pyrrolidine-2,5-dione compounds of formula (V), N-alkyl substituted pyrrolidine-2,4-dione compounds of formula (VI) or N-alkyl substituted pyrrolidine-2,3-dione compounds of formula (VII), comprises (a) providing a mixture containing at least one N-alkyl substituted pyrrolidone and (I)-(VII) in an amount of 1-20000 ppm, (b) hydrogenating the mixture obtained in step (a), and (c) distilling the mixture obtained in step (b). R : H or 1-20C alkyl. [Image] [Image]. |
