Organic compounds -- part of the class 532-570 series – Organic compounds – Oxygen containing
Patent
1996-05-10
1998-05-12
Geist, Gary
Organic compounds -- part of the class 532-570 series
Organic compounds
Oxygen containing
568829, C07C 3512, C07C 2700
Patent
active
057508038
ABSTRACT:
A continuous process is described for the preparation of D,L-menthol by catalytic hydrogenation of compounds which have the carbon skeleton of p-menthane containing at least one double bond and are 3-substituted by oxygen using hydrogen and/or by rearrangement of stereoisomers of menthol in the presence of hydrogen at temperatures of 150.degree. to 230.degree. C. and at pressures of 25 to 350 bar on fixed-bed catalysts made of support-free reduced shaped bodies made of pressed powders of cobalt (hydr)oxide, manganese (hydr)oxide, alkaline earth metal (hydr)oxides and, optionally, (hydr)oxides of elements of subgroup V and/or VI of the Periodic Table of the Elements.
REFERENCES:
patent: 2843636 (1958-07-01), Booth
patent: 4058571 (1977-11-01), Biedermann
patent: 5300706 (1994-04-01), Immel et al.
Ullmanns Encyclopedia of Industrial Chemistry, 3rd Ed., vol. 17, pp. 24-25, (1996).
Chemical Abstracts, vol. 112, No. 1, Jan. 1, 1990, Columbus, Ohio, US; abstract No. 7725, Zubareva, et al.: "Stereoselective hydrogenation of a menthol-isomenthol mixture on heterogeneous nickel, nickel-cobalt, and cobalt catalysts".
XP002012681 & IZV. AKAD. NAUK. SSSR, SER. KHIM., Bd. 8, 1989, Seiten 1920-1923.
Darsow Gerhard
Petruck Gerd-Michael
Bayer Aktiengesellschaft
Geist Gary
Puttlitz, Jr. Karl J.
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