title: Crystal structure of (Z)-2,3-di-chloro-1,4-bis-(4-meth-oxy-phen-yl)but-2-ene-1,4-dione.
abstract: The title compound, C18H14Cl2O4, adopts a Z conformation around the cental C=C bond. The two aromatic rings of the mol-ecule are nearly perpendicular to each other, with a dihedral angle between of 86.22 (14)°. The meth-oxy substituents lie close to the plane of the attached benzene rings. The C(ar)-C(ar)-O-C(Me) torsion angles are -2.4 (7) and 7.5 (6)°. Weak C-H⋯O inter-actions link the mol-ecules forming a three-dimensional network. The crystal packing also displays short [3.160 (3) Å] Cl⋯O halogen-bonding contacts between mol-ecules related by the screw axis. The structure exhibits disorder of one carbonyl O atom with a refined occupancy ratio of 0.21 (6):0.79 (6).
authors.affiliation: Department of Chemistry, Indian Institute of Technology Delhi, Hauzkhas, New Delhi 110 016, India.
authors.forename: Ram K
authors.initials: RK
authors.lastname: Tittal
authors.affiliation: Department of Chemistry, St Stephen's College, University Enclave, Delhi 110 007, India.
authors.forename: Satish
authors.initials: S
authors.lastname: Kumar
authors.affiliation: Department of Chemistry, Indian Institute of Technology Delhi, Hauzkhas, New Delhi 110 016, India.
authors.forename: R N
authors.initials: RN
authors.lastname: Ram
keywords: 2,3-di­chloro­but-2-ene-1,4-dione; CuCl/bpy; crystal structure; di­chloro­methyl radical; stereoselectivity; tri­chloro­methyl groups