𝔖 Bobbio Scriptorium
✦   LIBER   ✦

13C NMR spectroscopy of natural substances: IV—13C NMR studies of trachylobane diterpenes: Complete carbon assignment

✍ Scribed by A. Arnone; R. Mondelli; J. St Pyrek

Publisher
John Wiley and Sons
Year
1979
Tongue
English
Weight
322 KB
Volume
12
Category
Article
ISSN
0749-1581

No coin nor oath required. For personal study only.

✦ Synopsis

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 single‐frequency selective decoupling and shift reagent experiments. Shift calculations have been performed for the parent compound by using known methods. The results are discussed in comparison with the experimental data. Satisfactory agreement between predicted and experimental values has been obtained.

📜 SIMILAR VOLUMES

13C-NMR. Spectroscopy of Naturally Occur
13C-NMR. Spectroscopy of Naturally Occurring Substances. XLV. Iboga Alkaloids
✍ Ernest Wenkert; David W. Cochran; Hugo E. Gottlieb; Edward W. Hagaman; Raimundo 📂 Article 📅 1976 🏛 John Wiley and Sons 🌐 German ⚖ 399 KB

## Abstract The carbon shifts of the Iboga‐type alkaloids catharanthine, voacangine, coronaridine, ibogaine, dihydrocatharanthine and epiibogamine were recorded and correlated with the conformation of the natural bases. A ^13^C‐NMR. analysis of heyneanine determined its C(19) configuration and a si

Complete proton and 13C NMR spectral ass
Complete proton and 13C NMR spectral assignments of pentalongin
✍ Norbert De Kimpe; Luc Van Puyvelde; Jan Schripsema; Cees Erkelens; Robert Verpoo 📂 Article 📅 1993 🏛 John Wiley and Sons 🌐 English ⚖ 177 KB

## Abstract The ^1^H and ^13^C NMR spectra of pentalongin, a physiologically active natural product, were completely assigned. Some previous assignments were revised. All ^13^C^1^H coupling constants, both one‐bond and long‐range, were also measured.

Complete 1H and 13C NMR assignment of a
Complete 1H and 13C NMR assignment of a kaurane diterpene from Piliostigma thonningii
✍ M.-T. Martin; M. Païs; A. O. Ogundaini; J. C. Ibewuilke; F. O. Ogungbamila 📂 Article 📅 1997 🏛 John Wiley and Sons 🌐 English ⚖ 232 KB 👁 2 views

The diterpene ent-16a-hydroxykauran-18-oic acid was isolated from the leaves of Piliostigma thonningii. Structural elucidation and complete 1H and 13C NMR chemical shift assignments of this compound were achieved by 2D experiments.