Preparation of .beta.-carotene products with a high 9 (Z) conten

Details Preparation of .beta.-carotene products with a high 9 (Z) conten Preparation of .beta.-carotene products with a high 9 (Z) conten

1996-04-30

1997-11-18

Griffin, Walter D.

Chemistry of hydrocarbon compounds

Alicyclic compound synthesis

Carotene or derivative

C07C40300

Patent

active

056890222

ABSTRACT:
.beta.-Carotene products with a high proportion of the 9(Z) isomer are prepared starting from mother liquors from the industrial preparation of .beta.-ionylideneethyltriarylphosphonium salts (C.sub.15 -triarylphosphonium salts) by Wittig reaction of a C.sub.15 -triarylphosphonium salt which has been enriched in the 9Z isomer directly with .beta.-apo-12'-carotenal or else with 2,7-dimethyl-2,4,6-octatrienedial and subsequently with the C.sub.15 -triarylphosphonium salt and subsequent thermal isomerization.

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patent: 5310554 (1994-05-01), Haigh
Pure & Appl. Chem., vol. 63, No. 1, pp. 35-44, 1991, Kurt Bernhard, et al., "Recent Advances in the Synthesis of Achiral Carotenoids" (No Month).
Letters to Nature, vol. 355, pp. 359-361, Jan. 23, 1992, Arthur A. Levin, et al., "9-Cis Retinoic Acid Stereoisomer Binds and Activates the Nuclear Receptor RXR.alpha.".
Angew. Chem., vol. 77, pp. 277-360, 1965, H. Freyschlag, et al., "Bildung und Zerfall von Phosphoniumsalzen in der Vitamin-A-Reihe" (No Month).
"Organic Chemistry", Carey, pp. 668-672, 1987.
"Advanced Organic Chemistry", Carey et al. pp. 95-103, 1990.

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