- Synthesis of C40-symmetrical fully conjugated carotenoids by olefin metathesis
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In an effort to push olefin metathesis to the limits of conjugation in reactants and products, the C40-symmetrical carotenoids β,β-carotene (1), lycopene (2), (3R,3′R)-zeaxanthin (3), and rac-isozeaxanthin (4), which are conjugated undecaenes, have been synthesized from C21-terminal hexaenes by treatment with Grubbs' second-generation Ru catalyst in dichloromethane at 50 °C.
- Fontan, Noelia,Dominguez, Marta,Ulvarez, Rosana,De Lera, Ungel R.
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experimental part
p. 6704 - 6712
(2012/01/03)
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- METHOD FOR THE PREPARATION OF OXYCAROTENOIDS
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A high-yield process for preparing astaxanthin (3,3'-dihydroxy-β, β- carotene-4, 4'- dione) from silylated derivatives of zeaxanthin (3,3'-dihydroxy-β, β- carotene-3, 3'-diol), whether it be of synthetic or natural origin, is described.
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Page/Page column 8-9
(2010/07/10)
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