会员体验
专利管家(专利管理)
工作空间(专利管理)
风险监控(情报监控)
数据分析(专利分析)
侵权分析(诉讼无效)
联系我们
交流群
官方交流:
QQ群: 891211   
微信请扫码    >>>
现在联系顾问~
热词
    • 9. 发明授权
    • Process for the separation of isomeric cyclopropane-carboxylic acids
    • 异构环丙烷羧酸分离方法
    • US4599444A
    • 1986-07-08
    • US581081
    • 1984-02-17
    • Elemer FoggassyFerenc FaiglRudolf SoosJozsef Rakoczi
    • Elemer FoggassyFerenc FaiglRudolf SoosJozsef Rakoczi
    • C07C61/37C07B31/00C07B53/00C07B57/00C07C51/00C07C51/487C07C61/40C07C67/00
    • C07C51/487
    • The invention relates to a new process for separating the four stereoisomers of the cyclopropanecarboxylic acids of the formula ##STR1## wherein R stands for a methyl group or a halogen atom.The process comprisesreacting a salt formed with an alkali hydroxide or an alkali carbonate of dl-cis-trans-2,2-dimethyl-3-(2,2-disubstituted vinyl)-cyclopropanecarboxylic acids containing the isomers in any ratio or the pure dl-cis and dl-trans-2,2-dimethyl-3-(2,2-disubstituted vinyl)-cyclopropanecarboxylic acids prepared therefrom by the means of a selective dissolution with aromatic and aliphatic hydrocarbon solvents (suitably with benzene, extraction petroleum ether, n-hexane) with N-benzyl-2-aminobutanol enantiomers or with the hydrochlorides thereof in an aqueous medium or aqueous acetone medium, obtaining the crystalline diastereomeric salt from the solution by filtration, decomposing said salt by using a mineral acid, then separating the thus obtained optically active cyclopropanecarboxylic acidand obtaining the other isomer or other mixture of isomers from the filtrate of the said diastereomeric salt similarly after acidifying by a mineral acid, if desired, purifying the said optically active 2,2-di-methyl-3-(2,2-disubstituted vinyl)-cyclopropane-carboxylic acid isomers obtained by the above-mentioned procedure by a selective precipitation and recovering the resolving agent.
    • 本发明涉及用于分离式(I)的环丙烷羧酸的四种立体异构体的新方法,其中R代表甲基或卤素原子。 该方法包括使含有任何比例的异构体的dl-顺 - 反-2,2-二甲基-3-(2,2-二取代的乙烯基) - 环丙烷羧酸的碱金属氢氧化物或碱金属碳酸盐形成的盐或纯的 dl-顺式和dl-反式-2,2-二甲基-3-(2,2-二取代的乙烯基) - 环丙烷羧酸,其通过选择性溶解与芳族和脂族烃溶剂(适合于苯,萃取石油醚 正己烷)与N-苄基-2-氨基丁醇对映体或其盐酸盐在水性介质或丙酮水溶液中反应,通过过滤从溶液中获得结晶非对映体盐,通过使用无机酸分解所述盐,然后分离 由此获得的光学活性环丙烷羧酸,并从所述非对映异构体盐的滤液中得到其它异构体或其它异构体混合物,同样地在无机酸酸化后,如果需要, 通过选择性沉淀获得的通过上述方法获得的光学活性的2,2-二甲基-3-(2,2-二取代的乙烯基) - 环丙烷 - 羧酸异构体并回收拆分剂。