New Colours for Carotenoids – Synthesis of Pyran Polyenes

Abstract

A new type of carotenoid has been synthesized with a 2H-pyran ring placed in the polyene chain. This compound was successively elongated by Wittig reactions. The pyran-carotenoids obtained show a significant increased λ max compared with carotenoids lacking the pyran ring. A further remark-

Synthesis of a Highly Unsaturated, Stable Hydroxy Peroxide: A Yellow [lrarr2] Blue Color‐Changing Carotenoid Oxidation Product with Leuco Dye Properties

“…We have recently combined the structural characteristics of carotenoids and anthocyanidins; [35] the yellow p blue conversion CarO 3 p CarO 2 + now connects carotenoids with leuco dyes. Depending on the point of view, CarO 3 can either be considered a new type of leuco dye carbinol or a new carotenoid with potential antimalaria properties.…”

Key to Xenobiotic Carotenoids

“…It would furthermore be valuable to have at hand a complete directory of isotope-substituted carotenoids (D, T, 13 C, 14 C) [38,39,40]. A catalog of modified carotenoids (e.g., long chain carotenoids, carotenoid dimers, carotenoids with deviated conjugation, hydrophilic carotenoids) and of compounds where carotenoids are part of other molecule classes (e.g., carotenoid lipids, antioxidant combinations) would likewise be desirable [41,42,43,44,45,46,47,48,49,50,51].…”