title: Crystal structure of (2E)-1-(4-hy-droxy-1-methyl-2-oxo-1,2-di-hydro-quinolin-3-yl)-3-(4-hy-droxy-3-meth-oxy-phen-yl)prop-2-en-1-one.
abstract: In the title compound, C20H17NO5, the dihedral angle between the mean plane of the di-hydro-quinoline ring system (r.m.s. deviation = 0.003 Å) and the benzene ring is 1.83 (11)°. The almost planar conformation is a consequence of an intra-molecular O-H⋯O hydrogen bond and the E configuration about the central C=C bond. In the crystal structure, O-H⋯O hydrogen bonds generate chains of mol-ecules along the [10-1] direction. These chains are linked via π-π inter-actions [inter-centroid distances are in the range 3.6410 (16)-3.8663 (17) Å].
authors.affiliation: Chemistry Department, University of Kinshasa, Kinshasa XI BP 190, Democratic Republic of Congo.
authors.forename: Peter
authors.initials: P
authors.lastname: Mangwala Kimpende
authors.affiliation: Faculty of Chemical Technology, Hanoi University of Industry, Minh Khai Commune - Tu Liem District, Hanoi, Vietnam.
authors.forename: Ngoc Thanh
authors.initials: NT
authors.lastname: Nguyen
authors.affiliation: Faculty of Chemistry, Hanoi University of Science, 334 - Nguyen Trai - Thanh Xuan District, Hanoi, Vietnam.
authors.forename: Minh Thao
authors.initials: MT
authors.lastname: Nguyen
authors.affiliation: Chemistry Department, Hanoi National University of Education, 136 - Xuan Thuy - Cau Giay, Hanoi, Vietnam.
authors.forename: Quoc Trung
authors.initials: QT
authors.lastname: Vu
authors.affiliation: Chemistry Department, KU Leuven, Celestijnenlaan 200F, B-3001 Leuven (Heverlee), Belgium.
authors.forename: Luc
authors.initials: L
authors.lastname: Van Meervelt
keywords: 4-hy­droxy-1,2-di­hydro­quinolin-2(1H)-one; crystal structure; hydrogen bonding; α,β-unsaturated ketones; π–π inter­actions