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Issue 4, 2000

First preparation and characterization of the allenic carotenoids (all-E,6S)- and (9′Z,6S)-neoxanthin

Author affiliations

Abstract

Conditions for obtaining optimum allenic photoisomerization of (6R)-neoxanthin in benzene solution have been studied using diphenyl diselenide, diphenyl ditelluride or iodine as catalyst with various light qualities (sunlight, UVA irradiation or artificial, visible light) and intensities. The effect of adding base in order to prevent furanoid rearrangement was examined. At optimum conditions 77% conversion of (R)- to (S)-allene was observed for neoxanthin (UVA, 2 × molar excess diphenyl diselenide∶neoxanthin, presence of Hünig’s base). These conditions were superior to iodine catalyzed isomerization.

(All-E,6S)- and (9′Z,6S)-neoxanthin were prepared for the first time and characterized by chromatographic (HPLC) and spectroscopic (VIS, MS, 2D 1H NMR, CD) techniques. Other geometrical isomers of the allenic (6S)-series were obtained by (E )/(Z ) isomerization of (6S )-neoxanthin and characterized by HPLC and VIS data. At comparable conditions the ease of allenic (R)/(S ) isomerization was peridinin > fucoxanthin > neoxanthin.

Article information


Submitted
05 Sep 1999
Accepted
23 Nov 1999
First published
07 Feb 2000

J. Chem. Soc., Perkin Trans. 1, 2000, 595-598
Article type
Paper

First preparation and characterization of the allenic carotenoids (all-E,6S)- and (9′Z,6S)-neoxanthin

A. Strand and S. Liaaen-Jensen, J. Chem. Soc., Perkin Trans. 1, 2000, 595 DOI: 10.1039/A907366C

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