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US 9,067,877 B2Granted
Process for the production of 1,3,3-trimethyl-2-(3-methylpent-2-en-4-ynyl)cyclohex-1-ene
AssigneeDsm IP Assets B.V.
InventorsWerner Bonrath, Thomas Netscher, Jan Schütz, Bettina Wüstenberg
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Abstract
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.
Claims9
A process of production of 1,3,3-trimethyl-2-(3-methylpent-2-en-4-ynyl)cyclohex-1-ene according to formula (I):
- wherein the process comprises dehydrating 3 methyl-5-(2,6,6-trimethylcyclohex-1-enyl)pent-1-yn-3-ol according to formula (II):
- in the presence of at least one thiolate-bridged diruthenium complex as catalyst.
Dependencies are inferred from the claim text.