Long range13C-1H coupling constants IV—methoxy-, amino- and hydroxypyridines
- 1 May 1975
- journal article
- research article
- Published by Wiley in Magnetic Resonance in Chemistry
- Vol. 7 (5), 244-246
- https://doi.org/10.1002/mrc.1270070509
Abstract
One bond and long range 13C1H coupling constants for some methoxy-, amino- and hydroxypyridines are described. An unambiguous assignment of carbon-13 resonances is carried out based on the analysis of the fine splitting caused by long range couplings. J values for compounds other than 2- and 4-hydroxy-pyridines are explainable in terms of the values previouly obtained for cyano- and methylpyridines. The hydroxypyridine-pyridone tautomerism affects 2J(Hα), i.e. 2J associated with the α proton. This effect can be used to differentiate pyridones from hydroxypyridines.Keywords
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