NMR spectra of cardenolides with an oxygen-containing function at C10
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The NMR spectra of 12 cardenolides with oxygen-containing functions at C10 has been studied. The chemical shifts of the signals of the protons of the C18 angular methyl group, a butenolide ring, and some other protons have been discussed as functions of the structural features of the individual compounds.
KeywordsChemical Shift Methylene Proton Strong Field Weak Field CF3COOH
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