The present invention relates to an improved process for the production of 1,3,3-trimethyl-2-(3-methylpent-2-en-4-ynyl)cyclohex-1-ene, highly enriched in the Z-isomer, and the use of such compounds in organic syntheses, especially in processes forming intermediates (building blocks) the synthesis of vitamin A or β-carotene or other carotenoids, e.g. canthaxanthin, astaxanthin or zeaxanthin.
本发明涉及一种改进的制备1,3,3-三甲基-2-(3-甲基戊-2-烯-4-炔基)环己-1-烯的方法,该方法高度富集于Z异构体,并且在有机合成中使用这种化合物,特别是在形成中间体(构建块)合成
维生素A或
β-胡萝卜素或其他类
胡萝卜素的过程中,例如,红色素、
虾青素或
玉米黄质。