ABSTRACT
The 4-pyridones have provided less useful photochemical reactivity and, consequently, have been the subject of fewer studies.
Pyridones take two constitutional forms: 2-pyridones and 4-pyridones,
and
(Scheme 1). These two parent structures have tautomers, the corresponding hydroxypyridines
and
. These solventsensitive equilibria strongly favor the pyridone form.
