title: rac-4-(4-Chloro-phen-yl)-2-methyl-amino-3-nitro-5,6,7,8-tetra-hydro-4H-chromen-5-one.
abstract: The title compound, C16H15ClN2O4, contains a chiral centre and crystallizes as a racemate. The methyl-ene group β-positioned to the carbonyl group is partially (21%) disordered. It flips to the opposite sides of the corresponding six-membered carbocycle by -0.304 (3) and 0.197 (11) Å, producing alternative envelope conformations. The planes of the pyran and chloro-phenyl rings form a dihedral angle of 86.25 (9)°. The mol-ecular structure is characterized by an intra-molecular N-H⋯O inter-action, which generates an S(6) ring motif. The corresponding amino N atom deviates from the plane of the pyran ring by 0.1634 (19) Å. In the crystal, mol-ecules are linked via C-H⋯O hydrogen bonds, forming C(8) chains running parallel to the b-axis direction. The crystal structure also features C-H⋯π inter-actions.
authors.affiliation: Department of Physics, RKM Vivekananda College (Autonomous), Chennai 600 004, India.
authors.forename: P
authors.initials: P
authors.lastname: Narayanan
authors.forename: Jayabal
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authors.lastname: Kamalraja
authors.forename: Paramasivam T
authors.initials: PT
authors.lastname: Perumal
authors.forename: K
authors.initials: K
authors.lastname: Sethusankar
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