The present invention is directed to a process for the manufacture of methyl limonitrile comprising a mixture of 3,7-dimethyl-2,6-nonadiene nitrile, 3,7-dimethyl-3,6-nonadiene nitrile and 7-methyl-3-methylene-6-nonene nitrile comprising the following steps: a) reacting 6-methyl-5-octen-2-one with cyano acetic acid and removing carbon dioxide and water, wherein the reaction and the removal of carbon dioxide and water are performed in the presence of a base and a co-base in an organic solvent, wherein the base is pyridine, wherein the co-base is 1,4-diamino butane, and wherein the organic solvent is a solvent which forms a heteroazeotrop with water; b) removing the solvent and pyridine of the reaction mixture obtained after having performed step a) or step c) by distillation to obtain a reaction mixture; c) isomerizing the reaction mixture obtained after having performed step a) or step b) to obtain an isomerized reaction mixture; whereby step b) can be performed before or after step c).
本发明涉及一种制备甲基
柠檬腈的方法,包括由
3,7-二甲基-2,6-壬二烯腈、
3,7-二甲基-3,6-壬二烯腈和7-甲基-3-亚甲基-6-
壬烯腈的混合物组成,包括以下步骤:a)将
6-甲基-5-辛烯-2-酮与
氰乙酸反应,并去除
二氧化碳和
水,其中反应和去除
二氧化碳和
水是在存在碱和共碱的有机溶剂中进行的,其中碱是
吡啶,其中共碱是1,4-二
氨基
丁烷,有机溶剂是与
水形成异构共沸物的溶剂;b)通过蒸馏去除步骤a)完成后得到的反应混合物中的溶剂和
吡啶,以获得反应混合物;c)对执行了步骤a)或步骤b)后得到的反应混合物进行异构化,以获得异构化的反应混合物;其中步骤b)可以在步骤c)之前或之后执行。