Manufacture of 2,6,6-trimethyl-cyclohex-2-en-1-one

Details Manufacture of 2,6,6-trimethyl-cyclohex-2-en-1-one Manufacture of 2,6,6-trimethyl-cyclohex-2-en-1-one

1976-01-19

1977-05-03

Morgenstern, Norman

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

2603459, 260593R, 260586R, C07C 4500

Patent

active

040214915

ABSTRACT:
A process for the manufacture of 2,6,6-trimethyl-cyclo-hex-2-en-1-one by reacting 3-alkoxy-4-methyl-3-pentene or 3-alkoxy-4-methyl-2-pentene or a mixture of these compounds with acrolein, and reacting the resulting 2-alkoxy-2-ethyl-3,3-dimethyl-2,3-dihydro-4H-pyran with acids. The product is an intermediate for numerous syntheses of scents. Furthermore, a number of carotenoid syntheses are based on 2,6,6-trimethyl-cyclohex-2-en-1-one or its hydrogenation product, 2,6,6-trimethyl-cyclohexan-1-one.

REFERENCES:
patent: 3691205 (1972-09-01), Hoffmann et al.
patent: 3812190 (1974-05-01), Petrovich et al.
patent: 3857892 (1974-12-01), Wehrli
patent: 3932510 (1976-01-01), Muller

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