Process for preparing D,L-menthol from D-menthol

Details Process for preparing D,L-menthol from D-menthol Process for preparing D,L-menthol from D-menthol

1996-05-10

1998-05-26

Geist, Gary

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

Organic compounds

Oxygen containing

568829, C07C 2700, C07C 3512

Patent

active

057568642

ABSTRACT:
A process is described for preparing D,L-menthol by catalytic rearrangement of optically active D-menthol in the presence of hydrogen at temperatures of from 200 to 350.degree. C. and under pressures of from 50 to 350 bar over fixed-bed catalysts comprising support-free reduced shaped bodies of pressed powders of nickel, manganese, alkaline earth metal (hydr)oxides and optionally (hydr)oxides of elements of transition groups V and/or VI of the Periodic Table.

REFERENCES:
patent: 2843636 (1958-07-01), Booth
patent: 4058571 (1977-11-01), Biedermann
patent: 5300706 (1994-04-01), Immel et al.
Catalysis Letters, Bd. 29, 1994, pp. 57-67, XP00201695 Allakhverdiev, et al.: "Liquid-phase stereoselective thymol hydrogenation over supported nickel catalysts".

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