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Some substituted 2-pyridones form the dimer in solid state, for example the 5-methyl-3-carbonitrile-2-pyridone. The determination of all these structures was done by X-ray crystallography. In the solid state the hydrogen is located closer to the nitrogen so it could be considered to be right to call the colourless crystals in the flask 2-pyridone.
Whereas 2-pyridone (α) and 4-pyridone (γ) predominantly adopt the oxo form, the 3-pyridone (β) cannot, and instead adopts an equilibrium of the zwitterion form, pyridin-1-ium-3-olate, and the enol form, 3-hydroxypyridine (the canonical form). The 3-pyridone is not mesoionic. This property of 3-hydroxypyridine is leveraged in biology in ...
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[11] [12] As such, particular attention has been paid to developing methods of aromatization to yield pyridine derivatives under milder and efficient conditions. Such conditions include, but are not limited to: iodine in refluxing methanol, [ 11 ] chromium dioxide (CrO 2 ), [ 12 ] sodium chlorite , [ 13 ] and under metal-free, photochemical ...
4-Pyridone exists a keto-enol tautomerism with its enol tautomer 4-hydroxypyridine. In solution , the keto tautomer is favoured, [ 4 ] and the enol tautomer only becomes important in very dilute solutions or solutions of non-polar solvents.
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The following other wikis use this file: Usage on bs.wikipedia.org Tautomer; Usage on cs.wikipedia.org 2-pyridon; Usage on de.wikipedia.org 2-Pyridon