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Chemical compound
4-Pyridone is an organic compound with the formula C5H4NH(O). It is a colorless solid.
Preparation.
4-Pyridone, and its derivatives, are prepared from 4-pyrone and amines in protic solvents.
Tautomerism.
4-Pyridone exists a keto-enol tautomerism with its enol tautomer 4-hydroxypyridine. In solution, the keto tautomer is favoured, and the enol tautomer only becomes important in very dilute solutions or solutions of non-polar solvents. However, the enol tautomer is dominant in the gas phase. 
Derivatives.
Fluridone is an aquatic herbicide that contains a 4-pyridone subunit.
References.
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