Neues Verfahren zur Herstellung von Methyllimonitril

Details

Veröffentlichungs-Nr.

EP2628723

Aktenzeichen

EP12155593

Anmeldetag

15. Februar 2012

Veröffentlichung

10. September 2014

Erteilung

10. September 2014

Rechtsraum

EP

IPC

C07C253/30C07C255/07

Abstract

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).

Anmelder

Firma

DSM IP Assets B.V.

Land

🇳🇱 Niederlande

Fachgebiete