146. Neoflor und 6-Epineoflor aus Blueten von Trollius europaeus; Hochfeld-1H-NMR-Spektren von Neoxanthin und (9'Z)-Neoxanthin

Article abstract of DOI:10.1002/hlca.19900730608

Re-isolation of the very polar carotenoids from flowers of the title plant furnished two epimeric pentahydroxy compounds.Based on spectroscopical and chiroptical arguments and by chemical correlation with neoxanthin, their structures were established as 11 (proposed name neoflor) and 12 (6-epineoflor).Decoupling experiments and COSY-2D-1H-NMR spectra allowed a complete assignment of the vinyl protons of the two isomers, and furthermore, for the first time, also of those of (all-E)-neoxanthin and (9'Z)-neoxanthin.