## Abstract The ^13^C NMR chemical shifts of nine acetoxyxanthones are reported and identified. The acetoxy substituent effects have been evaluated and the corresponding shift increments proposed.
13C NMR spectroscopy of phorbol esters
β Scribed by Luc A. C. Pieters; Arnold J. Vlietinck
- Publisher
- John Wiley and Sons
- Year
- 1987
- Tongue
- English
- Weight
- 253 KB
- Volume
- 25
- Category
- Article
- ISSN
- 0749-1581
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β¦ Synopsis
Be 1 g i u m biaceae), and of six common acyl substituents of naturally occurring phorbol esters were recorded and the signals assigned. The spectral data for this series of model compounds appeared to be important tools for the identification and the structure elucidation of naturally occurring and semi-synthetic diterpene esters related to phorbol.
seed oil of Croton tiglium L. (Euphorbiaceae).' Nowadays the parent diterpene, phorbol, its naturally occurring esters and its semi-synthetic derivatives are important tools in inflammation and cancer research.' In order to provide additional information for the identification and structure elucidation of such products, it became necessary to obtain the I3C NMR spectral data of a series of model compounds in a systematic manner. Surprisingly, there are few reuorts of the I3C chemical _ _
π SIMILAR VOLUMES
## Abstract The ^13^C NMR spectra of 21 20βketopregnanes were examined and assigned. The substituent effects on the ^13^C chemical shifts are discussed on the basis of comparisons with published spectra of some closely related compounds.
## Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a βFull Textβ option. The original article is trackable v
## Abstract ^13^C shifts are reported for diastereomers with halogen, oxygen and amino substituents which are mainly at vicinal chiral centres. The conformer populations underlying the ^13^C shift analysis can be verified by chemical means, such as change of temperature, solvent polarity (with diha