title: Crystal structure of (Z)-3-[5-chloro-2-(prop-2-yn-yloxy)phen-yl]-3-hy-droxy-1-[4-(tri-fluoro-meth-yl)phen-yl]-prop-2-en-1-one.
abstract: The title compound, C19H12ClF3O3, obtained by the photochemical transformation of 2-[5-chloro-2-(prop-2-yn-yloxy)benzo-yl]-3-[4-(tri-fluoro-meth-yl)phen-yl]oxirane adopts a Z conformation with respect to the enolic C=C double bond. The dihedral angle between the benzene rings is 12.25 (16)° and an intra-molecular O-H⋯O hydrogen bond closes an S(6) ring. An intra-molecular C-H⋯O inter-action also leads to an S(6) ring. In the crystal, very weak C-H⋯O inter-actions and short Cl⋯Cl contacts [3.3221 (16) Å] are seen, as well as weak aromatic π-π stacking inter-actions [centroid-centroid separation = 3.879 (2) Å].
authors.affiliation: Department of Chemistry, Kurukshetra University, Kurukshetra 136 119, Haryana, India.
authors.forename: Aarti
authors.initials: A
authors.lastname: Dalal
authors.affiliation: Department of Chemistry, Kurukshetra University, Kurukshetra 136 119, Haryana, India.
authors.forename: Ramesh C
authors.initials: RC
authors.lastname: Kamboj
authors.affiliation: Department of Chemistry, Hindu College, University of Delhi, Delhi 110 007, India.
authors.forename: Dinesh
authors.initials: D
authors.lastname: Kumar
authors.affiliation: Department of Chemistry, Indian Institute of Technology, New Delhi 110 016, India.
authors.forename: Mahendra Kumar
authors.initials: MK
authors.lastname: Sharma
authors.affiliation: Department of Chemistry, Indian Institute of Technology, New Delhi 110 016, India.
authors.forename: Nagendran
authors.initials: N
authors.lastname: Selvarajan
keywords: crystal structure; hydrogen bonding; hy­droxy enone; photo-isomerisation; tautomerisation