## Abstract The rotational barriers about the CN bond of the N,N,N′,N′‐tetramethyldiamides of phthalic, isophthalic and terephthalic acids have been determined by the iterative total line shape NMR method. Some evidence about the conformation of these compounds in solution has also been obtained b
Conformational studies by nuclear magnetic resonance—IV: Restricted rotation in vinylogous thioamides
✍ Scribed by Janusz Dabrowski; Krystyna Kamieńska-Trela
- Publisher
- John Wiley and Sons
- Year
- 1972
- Tongue
- English
- Weight
- 304 KB
- Volume
- 4
- Category
- Article
- ISSN
- 0749-1581
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📜 SIMILAR VOLUMES
## Abstract Delocalisation of the nitrogen lone electron pair by an acyl and acylvinylogue group simultaneously, results in a lowering of both CN rotational barriers. MeC(O)CBrCHNMe~2~ and MeC(O)C(OCOMe)CHNMe~2~ exhibit restricted rotation around what is formally a double bond CC.
## Abstract The temperature dependence of the carbon‐13 NMR signals in three completely substituted 1,3,5‐trineopentylbenzenes has been studied by the Fourier transform technique. The assignment of all peaks was based on studies of 1,3,5‐trineopentylbenzene and some of its mono‐ and disubstituted d
## Abstract Carbon‐13 magnetic resonance spectra of the s‐__cis__ and s‐__trans__ rotamers of enamino ketones and thiones of the general formula \documentclass{article}\pagestyle{empty}\begin{document}${\rm X =}\mathop {\rm C}\limits^{\rm 1} {\rm (}\mathop {\rm R}\limits^{\rm 1} {\rm)}\mathop {\rm
The s-cis + s-trans equilibrium of several enamino ketones and aldehydes, has been evaluated based on the results of aromatic solvent induced shift measurements and of protonation of the title compounds. In contrast to cc,p-unsaturated ketones bearing no heteroatom, the A&,,,, value but not the A.83