## 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
Assignment of the 13C nuclear magnetic resonance spectra of three 27-hydroxyfriedelanes
✍ Scribed by A. A. Leslie Gunatilaka; N. P. Dhammika Nanayakkara; M. Uvais S. Sultanbawa; Mohamed I. M. Wazeer
- Publisher
- John Wiley and Sons
- Year
- 1982
- Tongue
- English
- Weight
- 132 KB
- Volume
- 18
- Category
- Article
- ISSN
- 0749-1581
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✦ Synopsis
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.
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The assignments of 13C and 1H NMR spectra for madeirane triterpenes are reported. The assignments were made on the basis of two-dimensional homonuclear 1H, 1H (COSY) and of 1H detected 1H, 13C heteronuclear correlation (HMQC) and also from a series of one-dimensional selective INEPT experiments. 19
## Abstract The high temperature ^13^C NMR spectra of the methyl esters of deuteroporphyrin‐IX and protoporphyrin‐IX, and octaethylporphyrin show sharp discrete signals for the inner macrocycle carbon resonances. The temperature dependence of these shifts is discussed.
## 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.