## Abstract A chemical shift analysis of the ^13^C NMR spectra of more than 50 acyclic sulphonic acids, alkali metal sulphonates and methyl esters was carried out. Chemical shift increment systems with __n__βalkanes as reference molecules were established for linear alkanesulphonates and alkβ2βenes
13C NMR chemical shifts of some highly-branched acyclic compounds
β Scribed by Richard M. Schwarz; Norman Rabjohn
- Publisher
- John Wiley and Sons
- Year
- 1980
- Tongue
- English
- Weight
- 332 KB
- Volume
- 13
- Category
- Article
- ISSN
- 0749-1581
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β¦ Synopsis
Abstract
A study has been made of the ^13^C chemical shifts of a number of acyclic alkanes, alkenes, nitriles and ketones which contain quaternary carbon atoms. Similar data have also been obtained for the series of compounds involved in the synthesis of triisopropylacetic acid. Substituent effects and steric factors in these highly substituted compounds are discussed in relation to the chemical shifts.
π SIMILAR VOLUMES
13C NMR chemical shift assignments have been made for a series of 1-substituted carbazoles, 8-substituted 1.2,3,4-tetrahydrocarbazoles, 1 -substituted benzo[a]carbazoles and 6-substituted dibenzo-[c,g]carbazoles. Single examples were examined of other classes of substituted carbazoles: 3-butylcarbaz
## Abstract An equation correlating ^13^C NMR chemical shifts and the global van der Waals energy of the carbon atoms (rms deviation Ξ΄ β€ 2.6 ppm) in aliphatic hydrocarbons, alcohols and chlorinated derivatives was derived. Molecular mechanics calculations have been used to determine the global van
## Abstract An extensive carbonβ13 nuclear magnetic resonance study of selected model olefins dissolved in deuteriochloroform has been carried out under standardized conditions. Assignments of the chemical shifts have been made. The influence of the nature of the solvent and the effect of changing
The I3C NMR spectra of various 1aminopyrrole derivatives are reported and the chemical shift assignments are discussed. The NMR assignments were confirmed by MNDO calculations.
## Abstract The ^13^C NMR spectra of a series of 2β(__n__βbutylthiomethylene) cycloalkanones and 2β(__n__βbutylthiomethylene) 1βdecalones were recorded and unequivocally assigned by the study of correlation signals in DQCOSY and HETCOR experiments. The effect caused by the introduction of the __n__