Acta Cryst. (2008). E64, o558  [ doi:10.1107/S1600536808003504 ]

1-Ethyl-1H-2,1-benzothiazin-4(3H)-one 2,2-dioxide

M. Shafiq, I. U. Khan, M. N. Tahir and W. A. Siddiqui

Abstract: In the title compound, C₁₀H₁₁NO₃S, there is distorted tetrahedral geometry around the S atom. The heterocyclic thiazine ring adopts a half-chair conformation. The ethyl and sulfonyl groups form dihedral angles of 82.53 (13) and 88.91 (9)°, respectively, with the plane formed by the benzothiazine ring, excluding the S atom; the S atom and the ethyl group lie on opposite sides of the ring. The molecules are linked into dimers by intermolecular C-HO hydrogen bonds involving benzene C-H and carbonyl O atoms, thus forming eight-membered rings. The dimers are linked into chains via interactions of a similar type. There is an intramolecular C-HO hydrogen bond.

Online 6 February 2008

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