The carbon shifts of the Iboga‐type alkaloids catharanthine, voacangine, coronaridine, ibogaine, dihydrocatharanthine and epiibogamine were recorded and correlated with the conformation of the natural bases. A 13 C‐NMR. analysis of heyneanine determined its C(19) configuration and a similar study of epiheyneanine proved its structure.
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Wenkert et al. (1976) studied this question.
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