title: (Z)-3-Hy-droxy-4-(4-meth-oxy-phen-yl)but-3-en-2-one.
abstract: 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 0.040 Å. The dihedral angle between this plane and that of the benzene ring is 5.88 (4)°. The 4-meth-oxy group also lies close to the benzene ring plane, with deviations of 0.0206 (11) Å for the O and 0.087 (2) Å for methyl C atoms. Hence, the whole mol-ecule is almost planar with an r.m.s. deviation of 0.0617 Å from a plane through all 14 non-H atoms. In the crystal, the molecules are linked by O-H⋯O hydrogen bonds, generating [010] chains.
authors.affiliation: Analysis and Testing Center, Dushu Lake Campus, Suzhou University, Suzhou 215123, People's Republic of China.
authors.forename: Wei
authors.initials: W
authors.lastname: Fang
authors.forename: Jun-Ping
authors.initials: JP
authors.lastname: Hu
authors.forename: Mei
authors.initials: M
authors.lastname: Wang
authors.forename: Mu-Zi
authors.initials: MZ
authors.lastname: Chen