Journal ArticleDOI
Nuclear Magnetic Resonance Spectroscopy. Carbon-13 Spectra of Some Inositols and Their O-Methylated Derivatives
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TLDR
In this paper, the C nmr spectra of some inositols and their partially O-methylated derivatives are tabulated and discussed, and a system of empirical constants which can be used to estimate the spectral properties of the carbons of these ring systems is derived.Abstract:
The ^(13)C nmr spectra of some inositols and their partially O-methylated derivatives are tabulated and
discussed. Methods of assignment are detailed. A system of empirical constants which can be used to estimate
the spectra of the carbons of these ring systems is derived. The substituent effects are noted to conform generally to the notion that steric or proximity effects are very important sources of chemical-shift differences in these systems.read more
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Studies on synthesis and structure-activity relationships against cytoprotective activity of triterpenoidal diglycosides with an acid saccharide, d-glucopyranosuronic acid
TL;DR: Several triterpenoid α- and β-diglycosides of oleanoic acid (1), 11-deoxoglycyrrhetic acid (4), and 11deox glycyrrhizin (5) were synthesized in this article.
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Carbon-13 magnetic resonance study of spiro compounds
TL;DR: In this paper, a large series of cyclohexane and cyclopentane spiro compounds have been studied by carbon-13 NMR and a series of changes have been derived in terms of α, β, γ spiro substituent effects.
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Naturstoffe aus Arzneipflanzen, XXI. 13C‐NMR‐spektroskopische Untersuchungen an Flavanoiden
TL;DR: The typical changes in Chemical shifts caused by acetylation of the OH group at the secondary C-3 are reported in this article, which are independent of the substitution pattern, and they show that on alteration of the oxidation level of nucleus C of the flavanoid skeleton characteristic changes appear for the shifts of carbon atoms of nuclei A and B.
Journal ArticleDOI
Strukturbestimmung von O‐Methylazafrinmethylester durch 13C‐NMR.‐Spektroskopie
TL;DR: In this paper, the structure of azafrin methyl ester was determined by a partial analysis of the 13C-NMR-spectra using vicinal 13C-, 1H-spin coupling.
Journal ArticleDOI
A rapid method for isolating phorbol from croton oil.
TL;DR: The published method for isolating phorbol from croton oil has been improved and made more rapid, mainly by the addition of silica-gel column chromatography, including the 13C nuclear magnetic resonance (NMR) spectrum.