The molecular structures of ,4-dimethylphenyl)-2-ethyl-3-hydroxypyridi
n-4-one, C15H17NO2, (1), 2-ethyl-3-hydroxy-1-(4-methylphenyl)pyridin-4
-one, C14H15NO2, (2), and -ethyl-3-hydroxy-1-(4-methoxyphenyl)pyridin-
4-one, C14H15NO3, (3), have been determined. The compounds all exhibit
mutually hydrogen-bonded dimeric pairs. In the case of (1), the molec
ules of the dimer are symmetry related, while in (2) and (3) two indep
endent molecules of the asymmetric unit are linked.