The molecular structures of 2-ethyl-3-hydroxy-1-(3, 4-dimethylphenyl) pyridin-4-one, C15H17NO2,(1), 2-ethyl-3-hydroxy-1-(4-methylphenyl) pyridin-4-one, C14H15NO2,(2) and 2-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 molecules of the dimer are symmetry related while in (2) and (3) two ...