Preparation of pure trans- and cis-4-Hydroxy-2,2,6-trimethylcycl

Details Preparation of pure trans- and cis-4-Hydroxy-2,2,6-trimethylcycl Preparation of pure trans- and cis-4-Hydroxy-2,2,6-trimethylcycl

1996-11-19

1998-07-07

Reamer, James H.

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

Organic compounds

Oxygen containing

203 5, C07C 4582

Patent

active

057771731

ABSTRACT:
A process for the preparation of pure trans- and cis-4-hydroxy-2, 2,6-trimethylcyclohexan-1-one from a mixture of these isomers comprises fractionally rectifying the isomeric mixture in a suitable column having from about 30 to 80 theoretical separation stages at temperatures of preferably from 50.degree. to 130.degree. C. and a pressure in the range from 0.1 to 5 mbar. The products are essential intermediates for the preparation of 3-hydroxycarotenoids such as cryptoxanthin and zeaxanthin.

REFERENCES:
Helvetica Chimica Acta, vol. 73, pp. 860-867, 1990, Erich Widmer, et al., Technical Procedures for the Syntheses of Carotenoids and Related Compounds from 6-OXO-Isophorone: Synthese of (3R, 3'R)-Zeaxanthin.
Helvetica Chimica Acta, vol. 59, pp. 1832-1849, 1976, Hans Georg Wilhelm Leuenberger, et al., "Synthese Von Optisch Aktiven, Naturlichen Carotinoiden Und Strukturell Verwandten Naturprodukten. I. Synthese Der Chiralen Schusselverbindung (4R,6R)-4-Hydroxy-2,2,6-Trimethylcyclohexanon".
VCH-Verlagsgesellschaft, pp. 103-107, 1988, Klaus Sattler, "Thermische Trennverfahren".
Firmenchrift of Sulzer Chemtech AG, pp. 1-9, 22-26, "Trennkolonnen fur Destillation Und Absorption", 1989.

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