Cymenol preparation by transfer dehydrogenation

Details Cymenol preparation by transfer dehydrogenation Cymenol preparation by transfer dehydrogenation

1990-09-06

1991-11-26

Lone, Werren B.

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

Organic compounds

Oxygen containing

568782, C07C 3906

Patent

active

050684663

ABSTRACT:
The invention relates to a process for the conversion of 8-hydroxymenthenes into 8-hydroxycymenes by reacting the 8-hydroxymenthenes in the liquid phase in the presence of a dehydrogenation catalyst, e.g. palladium and a hydrogen acceptor e.g. mesityl oxide. The process is preferably carried out at 80.degree.-150.degree. C. and in the presence of base. The process is particularly suitable for converting 8-hydroxy-p-menth-1-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
patent: 2743300 (1956-04-01), Joris
patent: 2881220 (1959-04-01), Griffin
Brieger et al., Catalytic Transfer Hydrogenation, Chemical Reviews, vol. 74, No. 5, 1974.
Arctander, "Perfume and Flavor Chemicals", vol. II, 1969, Pub. by Author, Montclair, N.J., TP983 A8C.

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