Cymenol preparation by direct dehydrogenation

Details Cymenol preparation by direct dehydrogenation Cymenol preparation by direct dehydrogenation

1990-09-06

1992-01-21

Lone, Werren B.

Organic compounds -- part of the class 532-570 series

Organic compounds

Oxygen containing

568781, C07C 3706

Patent

active

050829793

ABSTRACT:
The invention relates to a process for the conversion of 8-hydroxymenthenes into 8-hydroxycymenes by treating the 8-hydroxymenthenes in the vapor phase with a dehydrogenation catalyst, e.g. palladium. The process is preferably carried out at 80.degree.-150.degree. C. The hydroxymenthene vapor is preferably passed through the catalyst system at a pressure below 8 kPa and/or with the aid of an inert gas or vapor. Oxygen may be present as a hydrogen acceptor. The process is particularly suitable for converting 8-hydroxy-p-menth-l-ene into 8-hydroxy-p-cymene. The reaction products are of value as intermediates in the preparation of fragrance chemicals.

REFERENCES:
patent: 2361532 (1944-10-01), Cox
patent: 2366409 (1945-01-01), Johnston
Arctander, "Perfume and Flavor Chemicals", vol. 1 (1969), #573.
Arctander, "Perfume and Flavor Chemicals", vol. 11 (1969), #2944.

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