SCHEDULED MAINTENANCE
A stereochemically controlled synthesis of the cis-(Z)-4-isomer (26; R = Me) of methylbixin is described, which involves 5-methoxycarbonyl-3-methylpenta-cis-(Z)-2,trans-(E)-4-dien-1-al (6) as the key intermediate. The product is shown to be identical with the methyl ester of natural bixin.
G. Pattenden, J. E. Way and B. C. L. Weedon, J. Chem. Soc. C, 1970, 235 DOI: 10.1039/J39700000235
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