Process for the preparation of d,1-menthol

Details Process for the preparation of d,1-menthol Process for the preparation of d,1-menthol

1993-03-10

1994-04-05

Lone, Werren B.

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

Organic compounds

Oxygen containing

568829, C07C 2900, C07C 2917

Patent

active

053007069

ABSTRACT:
A process for the preparation of d,l-menthol by catalytic hydrogenation of aromatic or partly hydrogenated cyclic compounds which have the carbon skeleton of menthol having at least one double bond and are substituted by oxygen in the 3-position relative to the methyl group, with simultaneous rearrangement of optically active or inactive stereoisomers of menthol at elevated temperature and under pressure is described. The hydrogenation, which is to be carried out continuously, is carried out on a fixed bed catalyst which comprises, as active constituents, palladium, ruthenium or rhodium or a mixture of these elements, and comprises alkali metal hydroxides and/or alkali metal sulphates as promoters; the support for this catalyst is doped with a rare earth metal and manganese.

REFERENCES:
patent: 2843636 (1958-07-01), Booth
patent: 2871272 (1959-01-01), Bottoms
patent: 3078316 (1963-02-01), Bottoms
patent: 4058571 (1977-11-01), Biedermann
patent: 4943549 (1990-07-01), Immel et al.
Chemical Abstracts, vol. 105, 1986, p. 754, Abstract No. 191414; "Stereoselective Hydrogenation of Thymol".

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