The 13C NMR assignments of ten triterpene hydrocarbons of the hopane group are presented. Assignments for eight of the hydrocarbons are reported for the first time, whilst revisions to the published assignments of hopane and 17a-hopane are described.
13C NMR studies of some lupane and taraxerane triterpenes
β Scribed by Roshan C. Carpenter; Subramaniam Sotheeswaran; M. Uvais S. Sultanbawa; B. Ternai
- Publisher
- John Wiley and Sons
- Year
- 1980
- Tongue
- English
- Weight
- 362 KB
- Volume
- 14
- Category
- Article
- ISSN
- 0749-1581
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β¦ Synopsis
Abstract
The ^13^C NMR spectra of eight triterpenes are recorded and all carbon shifts have been assigned. The data are in agreement with the structures assigned to the rare lupanediol, lupβ20(29)βeneβ3Ξ±,23βdiol, and other lupane triterpenes isolated from the Sri Lankan Glochidion species (Euphorbiaceae). The ^13^C NMR data of some triterpenes, aleuritolic acid derivatives and taraxerane derivatives are compared.
π SIMILAR VOLUMES
## Abstract The ^13^C chemical shifts and oneβbond carbonβhydrogen coupling constants have been obtained for some hydroxycoumarins and their corresponding acetoxy and methoxy derivatives. The changes in the oneβbond carbonβhydrogen coupling constants resulting from the conversion of a hydroxy group
The detailed 1 H and 13 C NMR assignments of the four known triterpenes 3Λ-hydroxyurs-12-en-28oic acid, 3-oxo-24-methylenecycloartan, 3-oxo-11Λ-hydroxy-20(29)lupen and 29-hydroxyfriedelin, isolated from three Brazilian plants, were achieved by 1D and 2D techniques such as DEPT, HETCOR, HMQC, HMBC, C