8-hydroxycymene preparation by dehydrogenation

Organic compounds -- part of the class 532-570 series – Organic compounds – Oxygen containing

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Details

568715, 568726, C07C 2900, C07C 2700

Patent

active

053130081

ABSTRACT:
The invention relates to a process for the conversion of 8-hydroxymenthenes into 8-hydroxycymenes by treating the 8-hydroxymenthenes in the vapour phase with an alkaline dehydrogenation catalyst, e.g. palladium on an alkaline support. The process is carried out above 145.degree. C. The hydroxymenthene vapour is preferably passed through the catalyst system at a pressure below 8 kPa and/or with the aid of an inert gas or vapour. Oxygen may be present as a hydrogen acceptor. 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 musk fragrance chemicals.

REFERENCES:
patent: 2361532 (1944-10-01), Cox
patent: 2366409 (1945-01-01), Johnston

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