申请人:Ciba Specialty Chemicals Holding Inc.
公开号:EP0853078A1
公开(公告)日:1998-07-15
A method for the purification of a keto acid having the general formula
wherein R1 and R2 independently represent a straight or branched chain alkyl of 1-18 carbon atoms, a cycloalkyl of 4-8 carbon atoms or a phenyl both of which may be substituted by at least one substituent selected from the group consisting of halogen atoms and alkyls having 1-4 carbon atoms, an aralkyl of 7-10 carbon atoms, alkoxyalkyl having 2-20 carbon atoms, tetrahydrofuryl alkyl, alkylcarboxy alkyl, alkyl carboxy benzyl, or R1 and R2 together with the adjacent nitrogen atom may form a heterocyclic ring, or one of R 1 and R2 is hydrogen, which comprises slurrying the keto acid with an alcohol solvent, maintaining the slurry at elevated temperature in a sealed vessel until the Rhodamine impurity has dissolved, cooling and isolating the pure keto acid by filtration.
一种具有通式的酮酸的提纯方法
其中 R1 和 R2 分别代表 1-18 个碳原子的直链或支链烷基、4-8 个碳原子的环烷基或苯基,二者均可被至少一个取代基取代,取代基可选自卤素原子和 1-4 个碳原子的烷基、7-10 个碳原子的芳烷基、2-20 个碳原子的烷氧基烷基、四氢糠基烷基、烷基羧基烷基、烷基羧基苄基组成的组、R1 和 R2 与相邻的氮原子一起可形成杂环,或者 R 1 和 R2 中的一个是氢,其中包括用醇溶剂将酮酸浆化,在密封容器中保持浆液高温,直到罗丹明杂质溶解,冷却并通过过滤分离出纯酮酸。