Acta Cryst. (2012). E68, o92  [ doi:10.1107/S1600536811052615 ]

2-(3-Benzoyl-4-hydroxy-1,1-dioxo-2H-1⁶,2-benzothiazin-2-yl)-1-phenylethanone

N. Sattar, H. L. Siddiqui, S. I. H. Bukhari, M. Ahmad and M. Parvez

Abstract: In the title molecule, C₂₃H₁₇NO₅S, the heterocyclic thiazine ring adopts a half-chair conformation, with the S and N atoms displaced by 0.383 (3) and 0.473 (3) Å, respectively, on opposite sides of the mean plane formed by the ring C atoms. The phenyl rings attached to carbonyl groups lie almost parallel to each other at a dihedral angle 7.43 (9)°, the distance between the centroids of the rings being 3.780 (1) Å. The C(thiazine)-C=O and O=C-CH₂ groups make dihedral angles of 37.56 (16) and 1.93 (18)°, respectively, with the phenyl groups to which they are attached. The crystal structure features O-HO and C-HO hydrogen bonds and further consolidated by C-H interactions; an intramolecular O-HO hydrogen bond is also present.

Online 10 December 2011

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