申请人:RHONE-POULENC INC.
公开号:EP0009865A1
公开(公告)日:1980-04-16
Mixtures of the E and Z isomers of aryl alkyl oximes are converted to 98% or greater E isomer by a process comprising treating a solution of a mixture of E and Z isomers in an organic solvent with a protic or Lewis acid, under anhydrous conditions, to precipitate >98% pure E isomer of an immonium complex and neutralizing the precipitate with an excess of dilute organic/inorganic base, such as Na2CO3 or NaHCO3. The E isomer of the ketoxime is precursor for highly insecticidal ketoximinoethers.
芳基烷基肟的 E 异构体和 Z 异构体混合物可通过以下工艺转化为 98% 或更高的 E 异构体:在无水条件下,用质酸或路易斯酸处理 E 异构体和 Z 异构体混合物在有机溶剂中的溶液,沉淀出大于 98% 的纯 E 异构体铵络合物,并用过量的稀有机/无机碱(如 Na2CO3 或 NaHCO3)中和沉淀物。酮肟的 E 异构体是高杀虫性酮肟醚的前体。