3,3-Dichloro-1-ethyl-1H-2,1-benzothia-zin-4(3H)-one 2,2-dioxide

3,3,6-Tribromo-1-methyl-1H-2,1-benzo-thia-zin-4(3H)-one 2,2-dioxide

In the title compound, C₉H₆Br₃NO₃S, a halogenated benzothia­zine derivative, the thia­zine ring adopts a sofa conformation. The crystal studied was a racemic twin with a contribution of 72 (1)% of the major domain.

1-Propyl-1H-2,1-benzothia-zin-4(3H)-one 2,2-dioxide

In the title compound, C(11)H(13)NO(3)S, a benzothia-zine derivative, the heterocycle adopts a sofa conformation. In the crystal, weak C-H⋯O hydrogen bonds connect the mol-ecules into a three-dimensional network.

6-Bromo-3,3-dichloro-1-methyl-1H-2,1-benzothia-zin-4(3H)-one 2,2-dioxide

The monomeric title compound, C₉H₆BrCl₂NO₃S, has an envelope-shaped thia­zine ring with the S atom 0.879 (9) Å out of the mean square plane of the envelope. The π–π distances between the centroids of the heterocyclic rings are 4.191 (5) and 4.110 (5) Å. The closest intermolecular inter­actions between the O atoms of the carbonyl and sulfonyl groups with Br and Cl atoms are 2.987 (7) and 2.992 (8) Å, respectively.