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H and C NMR chemical shifts for neutral (3-hydroxypyridine and 3-methoxypyridine) and zwitterionic (N-ethyl-3-oxypyridinium betaine and 3-pyridone) molecules were calculated by GIAO/B3LYP/6-31G(d,p) and IGLO/deMon/NMR approaches. Linear correlations between the calculated and experimental H and C NMR chemical shifts for 3-hydroxypyridine, 3-methoxypyridine, and N-ethyl-3-oxypyridinium betaine suggest that the 3-hydroxy tautomer is dominant in DMSO-d6. The lack of such a correlation for 3-pyridone indicates an absence of this species in DMSO-d6 solution.

THEORETICAL AND EXPERIMENTAL 1H AND 13C NMR SPECTRA OF 3-HYDROXYPYRIDINE, 3-METHOXYPYRIDINE, AND N-ETHYL-3-OXYPYRIDINIUM BETAINE*