13C NMR spectra of a number of penta- and hexacyclic triterpenoids derived from glycyrrhetic acid
✍ Scribed by G. A. Tolstikov; L. M. Khalilov; L. A. Baltina; R. M. Kondratenko; A. A. Panasenko; E. V. Vasil'eva
- Publisher
- Springer
- Year
- 1985
- Tongue
- English
- Weight
- 597 KB
- Volume
- 21
- Category
- Article
- ISSN
- 0009-3130
No coin nor oath required. For personal study only.
📜 SIMILAR VOLUMES
A full assignment of the 13C signals of four pentacyclic triterpenes confirms the results obtained by 'H NMR analysis of steroidal methyls, resolving the stereochemistry of the oxidation product of 3-~-acetoxyolean-12-en-30-oic acid methyl ester.
## Abstract The solid‐state CP/MAS ^13^C‐NMR spectra (cross‐polarization/magic‐angle spinning ^13^C‐NMR) of eight lower cyclic and one linear oligomers and several polymers of (__R__)‐3‐hydroxybutanoic acid (3‐HB) are reported. The polymeric samples of different origin and molecular weight give rem
The 13C NMR spectra of five pairs of 18p-and 18r~-ll-oxooleanolic acid derivatives have been assigned. The chemical shifts of C-12, C-13, C-17, C-18 and C-28 are of diagnostic value for the determination of the DIE junction stereochemistry. KEY WORDS "C NMR 18p-11 -oxooleanolic acid derivatives 18a-
## Abstract ^29^Si and ^13^C NMR chemical shifts are reported for __tert__‐butyldimethylsilyl (TBDMS) derivatives of ten common amino acids. The ^29^Si chemical shifts of TBDMS derivatives of various functionalities encountered fall into distinct spectral regions. The ^29^Si chemical shifts correla