title: 2,3-Diphenyl-2,3-di-hydro-4H-pyrido[3,2-e][1,3]thia-zin-4-one.
abstract: In the racemic title compound, C19H14N2OS, the two phenyl substituents on the 1,3-thia-zine ring are almost perpendicular to the pyridine ring which is fused to the thia-zine ring [inter-ring dihedral angles = 87.90 (8) and 85.54 (7)°]. The dihedral angle between the two phenyl rings is 75.11 (7)°. The six-membered thia-zine ring has an envelope conformation with the ortho-related C atom forming the flap. The crystals exhibit face-to-edge aromatic-ring interactions with the nearest C-H⋯C distance equal to 3.676 (3) Å.
authors.affiliation: Department of Chemistry, Pennsylvania State University, University Park, PA 16802, USA.
authors.forename: Hemant P
authors.initials: HP
authors.lastname: Yennawar
authors.affiliation: Pennsylvania State University, Schuylkill Campus, 200 University Drive, Schuylkill Haven, PA 17972, USA.
authors.forename: Harnoor
authors.initials: H
authors.lastname: Singh
authors.affiliation: Pennsylvania State University, Schuylkill Campus, 200 University Drive, Schuylkill Haven, PA 17972, USA.
authors.forename: Lee J
authors.initials: LJ
authors.lastname: Silverberg