## Abstract The diterpene trachylobane and a series of derivatives have been completely analysed by FT ^13^C NMR spectroscopy. All ^13^C frequencies for trachylobanol have been unambiguously assigned by experimental techniques, i.e. by proton singleโfrequency selective decoupling and shift reagent
Carbon-13 NMR spectroscopy of hop bitter substances
โ Scribed by F. Borremans; M. De Potter; D. De Keukeleire
- Publisher
- John Wiley and Sons
- Year
- 1975
- Tongue
- English
- Weight
- 315 KB
- Volume
- 7
- Category
- Article
- ISSN
- 0749-1581
No coin nor oath required. For personal study only.
โฆ Synopsis
Abstract
The ^13^C NMR spectra of the most important hop bitter substances are analysed. All individual carbon atoms are assigned, except the oxygen bonded sp^2^ carbon atoms. Most assignments are made partly by comparison with analogous compounds and partly by reference to literature data. Crossโcorrelations with the ^1^H NMR shifts are made for two main products and confirm the correctness of the assignments. All data are in agreement with the known structures.
๐ SIMILAR VOLUMES
This book provides both an introduction for the novice and a review for the expert to the rapidly developing field of 13 C NMR spectroscopy of biological systems. It consists of a forward by Joachim Seelig, a preface by the author, and six chapters dealing with basic principles and key applications.
## Abstract ^13^C NMR spectra of six kawaโpyrones (styryl ฮฑโpyrones) have been assigned. The assignments are based on the splitting pattern in the coupled spectra, comparison of the chemical shifts with those of model compounds and by application of additivity relationships. The ^13^C NMR of styren
## Abstract Carbonโ13 NMR signal assignment of a number of polyoxygenated triterpenes of the oleanโ12โene and ursโ12โene series, carried out by considering the changes in chemical shift produced by the change of oxygenation pattern(s), and using methyl oleanolate as a model, are reported.
## Abstract The carbon shifts of the Ibogaโtype alkaloids catharanthine, voacangine, coronaridine, ibogaine, dihydrocatharanthine and epiibogamine were recorded and correlated with the conformation of the natural bases. A ^13^CโNMR. analysis of heyneanine determined its C(19) configuration and a si