期刊
PURE AND APPLIED CHEMISTRY
卷 74, 期 8, 页码 1369-1382出版社
INT UNION PURE APPLIED CHEMISTRY
DOI: 10.1351/pac200274081369
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Symmetrical C-40-carotenoids are efficiently produced by double Wittig olefination of the corresponding C-15-phosphonium salts with C-10-dialdehyde. Industrial syntheses of lycopene, astaxanthin, and (3R,3'R)-zeaxanthin-C-15-phosphonium salts are discussed. An efficient route to a monoprotected C-10-dialdehyde for the synthesis of unsymmetrical C-40-carotenoids is presented. Primary polyene allyl alcohols can be converted to the corresponding aldehydes by TEMPO oxidation. A high-yield synthesis of meso-zeaxanthin as an example for syntheses of unsymmetrical carotenoids is presented.
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