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Proton and carbon 13 nmr spectral analysis of some necines of toxic pyrrolizidine alkaloids



Proton and carbon 13 nmr spectral analysis of some necines of toxic pyrrolizidine alkaloids



Fresenius' Journal of Analytical Chemistry 342(9): 719-722



The total assignment of the 1H and 13C NMR spectra of the necines of toxic pyrrolizidine alkaloids (retronecine, heliotridine, crotanecine, otonecine), their hydrochlorides and their N-oxides has been performed. The characteristic chemical shift differences between retronecine and heliotridine, as well as the protonation and N-oxidation shift effects in NMR studies of necines at the corresponding position are proposed to be an additional assignment aid. The assignment of the spectra was achieved by the concerned use of 2D correlation spectroscopy.

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Accession: 007702051

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