Acta Crystallographica Section C

Crystal Structure Communications

Volume 64, Part 1 (January 2008)

organic compounds

gz3109 scheme

Acta Cryst. (2008). C64, o4-o6 [ doi:10.1107/S0108270107059173 ]

N-(X-Chlorophenyl)-4-hydroxy-2-methyl-2H-1,2-benzothiazine-3-carboxamide 1,1-dioxide (with X = 2 and 4)

W. A. Siddiqui, S. Ahmad, M. I. Tariq, H. L. Siddiqui and M. Parvez

Abstract: The structures of N-(2-chlorophenyl)-4-hydroxy-2-methyl-2H-1,2-benzothiazine-3-carboxamide 1,1-dioxide and N-(4-chlorophenyl)-4-hydroxy-2-methyl-2H-1,2-benzothiazine-3-carboxamide 1,1-dioxide, both C₁₆H₁₃ClN₂O₄S, are stabilized by extensive intramolecular hydrogen bonds. The 4-chloro derivative forms dimeric pairs of molecules lying about inversion centres as a result of intermolecular N-HO hydrogen bonds, forming 14-membered rings representing an R₂²(14) motif; the 2-chloro derivative is devoid of any such intermolecular hydrogen bonds. The heterocyclic thiazine rings in both structures adopt half-chair conformations.

Formula: Two isomers of C₁₆H₁₃ClN₂O₄S


	Structure factor file (CIF format) (173.4 kbytes) [ doi:10.1107/S0108270107059173/gz3109Isup2.hkl ] Contains datablock I

	Structure factor file (CIF format) (172.7 kbytes) [ doi:10.1107/S0108270107059173/gz3109IIsup3.hkl ] Contains datablock II

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