## Reference Data 13C NMR Chemical Shifts of N u nsubstituted-and N-MethyI-Pyramle Derivatives 13C shielding data for 100 derivatives of pyrazole are reported. These include methyl, ethyl, n-propyl, tert-butyl, phenyl, hydroxymethyl, carboxyl, ethoxycarbonyl, cyano. amino, hydrazino, nitro, azido,
The influence of methylation on 13C chemical shifts of galactose derivatives
β Scribed by W. Voelter; E. Breitmaier; E.B. Rathbone; M. Stephen
- Publisher
- Elsevier Science
- Year
- 1973
- Tongue
- French
- Weight
- 214 KB
- Volume
- 29
- Category
- Article
- ISSN
- 0040-4020
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It has been well established that the 13 C chemical shift of ring carbon atoms normally moves to higher field with decreasing ring size both for carbocyclic 1 and saturated heterocyclic2 compounds. Recent work3 has shown that in compounds where two of the cyclo-
## Abstract The ^13^C NMR spectra of thiacyclopentane (thiolane) and its monoβ and dimethyl derivatives at positions other than the heteroatom are reported. The ^13^C shieldings are found to be consistent with a description of these compounds in terms of equilibria between halfβchair conformers. An