Process for preparation of menthol by hydrogenation of...

Details Process for preparation of menthol by hydrogenation of... Process for preparation of menthol by hydrogenation of...

2011-06-14

2011-06-14

Witherspoon, Sikarl A (Department: 1621)

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

Organic compounds

Oxygen containing

Reexamination Certificate

active

07960593

ABSTRACT:
The present invention relates to a process for preparing racemic or optically active menthol by catalytically hydrogenating racemic or optically active isopulegol in the presence of hydrogen and catalysts which comprise nickel-, copper-, zirconium- and molybdenum-containing compounds. The present invention relates specifically to a corresponding process far continuously catalytically hydrogenating L-isopulegol to L-menthol.

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Dudley Sully, B., et al., “The Optical Rotation of Citronellel,” P.& E.O.R., vol. 59, pp. 365-366 (1968).
Pickard, R. H, et al., “The Alcohols of the Hydroaromatic and Terpene Series, Part III. isoPulegol,” Journal of the Chemical Society, Transactions vol. 117, pp. 1248-1263 (1920).

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