| 摘要 |
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 &bgr;-carotene or other carotenoids, e.g. canthaxanthin, astaxanthin or zeaxanthin. |
