Patent ID: 9255050
Filing Date: 2016-02-09
CPC Classification: C07C

Claim Text:
1. A process for the production of a compound of formula (I) with R is —CH wherein i) in a first step, acetone or methylacetone is reacted with ethyne in liquid NH ii) in a second step the alkali metal hydroxide catalyst is neutralized by acetic acid, and iii) in a third step, NH iv) in a fourth step, the salts are removed from compound of formula (I) using water and at least one extraction solvent, and v) in a fifth step, the organic phase comprising the extraction solvent (or mixture of extraction solvents) and compound of formula (I) is separated into its components, characterized in that after the third step at least an alkali metal hydroxide is added to the solution (=step iiia) before the fourth step is carried out.