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

C - Chemistry, Metallurgy

07

C

C07C 35/12 (2006.01) C07C 29/17 (2006.01) C07C 29/56 (2006.01) C07C 29/80 (2006.01) B01J 23/889 (2006.01)

Patent

CA 2176554

A continuous process is described for the preparation of d,1-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 to 230°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.

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