✦ LIBER ✦

Carbon-13 nuclear magnetic resonance spectra. VIII—18α- and 18β-glycyrrhetic acid derivatives

✍ Scribed by Helmut Duddeck; M. H. A. Elgamal; Guiliana Severini Ricca; Bruno Danieli; Giovanni Palmisano

Publisher: John Wiley and Sons
Year: 1978
Tongue: English
Weight: 211 KB
Volume: 11
Category: Article
ISSN: 0749-1581
DOI: 10.1002/mrc.1270110307

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

The ^13^C NMR data of six pairs of 18α/18β‐glycyrrhetic acid derivatives are presented. It is shown that the configuration at C‐18 can easily be recognized by inspecting the chemical shifts of several characteristic carbons, e.g. C‐12, C‐13, C‐18 and C‐28. The shifts of these carbons originated by the change of the D/E ring junction proved to be largely independent of the substitution at C‐3 and C‐20.

📜 SIMILAR VOLUMES

Triterpenoids. Part II—Carbon-13 NMR spe

Triterpenoids. Part II—Carbon-13 NMR spectra of 18β- and 18α-11-oxooleanolic acid derivatives

✍ U. Wrzeciono; L. Zaprutko; J. Budzianowski; H. Wojtowicz; D. Dubowska 📂 Article 📅 1987 🏛 John Wiley and Sons 🌐 English ⚖ 313 KB

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-