## Abstract ^13^C Nuclear magnetic resonance (NMR) spectra of atactic and syndiotactic‐rich poly(methacrylonitrile) (PMAN) were determined. In addition, 2D (^1^H‐^13^C COSY)COSY = COrrelated SpectroscopY. NMR spectra of α‐methyl and methylene regions of atactic PMAN were measured. Values of tetrad
13C nuclear magnetic resonance spectra of several podocarpane and cassane diterpenoids
✍ Scribed by A. Abad; C. Agulló; M. Arnó; L. R. Domingo; R. J. Zaragozá
- Publisher
- John Wiley and Sons
- Year
- 1990
- Tongue
- English
- Weight
- 348 KB
- Volume
- 28
- Category
- Article
- ISSN
- 0749-1581
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✦ Synopsis
Abstract
The ^13^C NMR spectra of several diterpenic derivatives having the podocarpane and cassane skeleton were recorded and interpreted. The most significant effects due to substituent orientation, B/C ring junction stereochemistry and conformational changes are briefly discussed.
📜 SIMILAR VOLUMES
## Abstract ^13^C chemical shifts and ^13^C^205^Tl spin–spin coupling constants are reported for phenylthallium(III) bis(trifluoroacetate) and some of its mono‐ and dimethyl derivatives. The signs of ^__n__^__J__(^13^C, ^205^Tl) relative to ^__n__+1^__J__(^1^H, ^205^Tl) are determined by offresona
## Abstract ^13^C NMR spectra of friedelan, friedelan‐21‐one, friedelan‐6‐one, friedelane‐321‐dione, friedelane‐3,6‐dione and friedelane‐3,6,21‐trione have been recorded and signals assigned using off‐resonance decoupling, inversion recovery and lanthanide induced shift techniques.
## Abstract Assignments of the ^13^C NMR resonances for some cassane diterpenoids have been made. The data have proved to be a useful tool for the stereochemical examination of the caesalpins.
## Abstract ^13^C NMR spectra of 27‐hydroxyfriedelane, kokoonol (27‐hydroxyfriedelan‐3‐one) and kokoononol (27‐hydroxyfriedelan‐3,21‐dione) have been recorded and signals assigned using the off‐resonance decoupling, inversion recovery and lanthanide induced shift techniques.