Synthesis of Diterpenes as Possible Biogenetic Precursors of the C2,,-Carotenoid Crocetin
SummaryWith regard to the investigation of the biosynthesis of the C,,-carotenoids in saffron the four diterpenes 6 9 were synthesized, who differ only in their degree of saturation. A detailed analysis of their 'H-and I3C-NMR spectra has been achieved by their mutual comparison.Einleitung. -Aus Safran electus pulvis wurden in fruheren Arbeiten [l] [2] verschie-
Zur Untersuchung der Biosynthese von C20‐Carotinoiden, wie z.B. des in Safran electus pulvis vorkommenden Crocetins, werden die beiden Diterpene (VI) bzw. (IX) ausgehend von der Reaktion zwischen dem Wittig‐Reagenz (I) und dem Aldehyd (II) bzw. aus dem Wittig‐Reagenz (VII) und dem Aldehyd (VIII) synthetisiert.
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