RESUMO
The title compound, C11H12O3, is potentially a butane-2,3-dione derivative but exists in the enol form in the solid state. In the mol-ecule, the 3-hy-droxy-but-3-en-2-one, benzene and methoxyl fragments are almost co-planar. The 3-hy-droxy-but-3-en-2-one fragment is almost planar with an r.m.s. deviation of 0.040â Å. The dihedral angle between this plane and that of the benzene ring is 5.88â (4)°. The 4-meth-oxy group also lies close to the benzene ring plane, with deviations of 0.0206â (11)â Å for the O and 0.087â (2)â Å for methyl C atoms. Hence, the whole mol-ecule is almost planar with an r.m.s. deviation of 0.0617â Å from a plane through all 14 non-H atoms. In the crystal, the molecules are linked by O-Hâ¯O hydrogen bonds, generating [010] chains.