A method of separating ZE-nepetalactone and EZ-nepetalactone from catnip oil involving mixing catnip oil dissolved in at least one water immiscible, non-halogenated organic solvent with at least one inorganic base dissolved in water to form a biphasic mixture, stirring the biphasic mixture to hydrolyze ZE-nepetalactone to form ZE-nepetalic acid, separating the aqueous phase containing ZE-nepetalic acid from the organic phase containing EZ-nepetalactone in the biphasic mixture, and optionally acidifying the aqueous phase to about pH 4.5 and adding at least one water immiscible, non-halogenated organic solvent to azeotropically lactonize the ZE-nepetalic acid in the presence of a catalytic amount of p-toluene sulfonic acid to form ZE-nepetalactone.
一种从猫
薄荷油中分离ZE-尼泊酮和EZ-尼泊酮的方法,涉及将溶解在至少一种不与
水混溶的非卤代有机溶剂中的猫
薄荷油与至少一种溶解在
水中的
无机碱混合,形成两相混合物,搅拌两相混合物以
水解ZE-尼泊酮形成ZE-尼泊酸,从两相混合物中分离含有ZE-尼泊酸的
水相和含有EZ-尼泊酮的有机相,可选地将
水相酸化至约pH 4.5,并添加至少一种不与
水混溶的非卤代有机溶剂,在
对甲苯磺酸的催化作用下,使ZE-尼泊酸发生共沸烯酮化反应形成ZE-尼泊酮。