title: Ethyl 5-oxo-4-phenyl-5,6-di-hydro-4H-1,3,4-oxadiazine-2-carboxyl-ate.
abstract: The asymmetric unit of title compound, C12H12N2O4, consists of two independent mol-ecules. In each mol-ecule, the oxadiazine ring has a flattened envelope conformation with the methyl-ene C atom as the flap atom, and the eth-oxy-carbonyl unit is in a syn-periplanar conformation with respect to the oxadiazine ring as indicated by O-C-C=O torsion angles of 1.9 (4) and 2.5 (4)°. The dihedral angles between the mean plane of the oxadiazine ring and the phenyl ring are 80.07 (13) and 42.98 (14)°. In the crystal, mol-ecules are linked by C-H⋯O hydrogen bonds and stacked in a double-column along the a-axis direction.
authors.affiliation: Department of Chemistry, Yuvaraja's College, University of Mysore, Mysore 570 005, India.
authors.forename: K
authors.initials: K
authors.lastname: Shubakara
authors.affiliation: Department of Studies in Physics, Manasagangotri, University of Mysore, Mysore 570 006, India.
authors.lastname: Chandra
authors.affiliation: Department of Chemistry, Yuvaraja's College, University of Mysore, Mysore 570 005, India.
authors.forename: N
authors.initials: N
authors.lastname: Srikantamurthy
authors.affiliation: Department of Studies in Physics, Manasagangotri, University of Mysore, Mysore 570 006, India.
authors.forename: M
authors.initials: M
authors.lastname: Mahendra
authors.affiliation: Department of Chemistry, Yuvaraja's College, University of Mysore, Mysore 570 005, India.
authors.forename: K B
authors.initials: KB
authors.lastname: Umesha