title: 4-(2-Nitro-benz-yl)-3-phenyl-3,4-di-hydro-2H-1,4-benzoxazin-2-ol.
abstract: The title compound, C21H18N2O4, crystallizes with two independent mol-ecules (A and B) in the asymmetric unit. In both mol-ecules the oxazine ring has an envelope conformation with the hydroxyl-substituted C atom as the flap. The nitro-benzyl ring and the phenyl ring are almost normal to the mean plane of the benzooxazine ring system with dihdral angles of 85.72 (15) and 82.69 (15)°, respectively, in mol-ecule A, and 85.79 (15) and 87.72 (15)°, respectively, in mol-ecule B. The main difference in the conformation of the two mol-ecules concerns the dihedral angle between the nitro-benzyl ring and the phenyl ring, viz. 79.67 (18) in mol-ecule A and 71.13 (18)° in mol-ecule B. In the crystal, the A and B mol-ecules are linked by an O-H⋯O hydrogen bond. These units are then linked via C-H⋯O hydrogen bonds, forming sheets lying parallel to (010). Further C-H⋯O hydrogen bonds link the sheets to form a three-dimensional network. There are also O-H⋯π and C-H⋯π inter-actions present, reinforcing the three-dimensional structure.
authors.affiliation: Laboratoire de Synthèse des Molécules d'Intérêts Biologiques, Département de Chimie, Faculté des Sciences Exactes, Université de Constantine 1, 25000 Constantine, Algeria.
authors.forename: Louisa
authors.initials: L
authors.lastname: Chouguiat
authors.affiliation: Laboratoire de Synthèse des Molécules d'Intérêts Biologiques, Département de Chimie, Faculté des Sciences Exactes, Université de Constantine 1, 25000 Constantine, Algeria.
authors.forename: Raouf
authors.initials: R
authors.lastname: Boulcina
authors.affiliation: Unité de Recherche de Chimie de l'Environnement et Moléculaire Structurale, CHEMS, Université Constantine 1, 25000 , Algeria ; Département Sciences de la Matière, Faculté des Sciences Exactes et Sciences de la Nature et de la Vie, Université Oum El Bouaghi 04000, Algeria.
authors.forename: Sofiane
authors.initials: S
authors.lastname: Bouacida
authors.affiliation: Unité de Recherche de Chimie de l'Environnement et Moléculaire Structurale, CHEMS, Université Constantine 1, 25000 , Algeria.
authors.forename: Hocine
authors.initials: H
authors.lastname: Merazig
authors.affiliation: Laboratoire de Synthèse des Molécules d'Intérêts Biologiques, Département de Chimie, Faculté des Sciences Exactes, Université de Constantine 1, 25000 Constantine, Algeria.
authors.forename: Abdelmadjid
authors.initials: A
authors.lastname: Debache
keywords: crystal structure