6-Bromo-3,3-dichloro-1-methyl-1H-2,1-benzothia­zin-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

2-{(E)-[(2Z)-(3-Chloro-1-methyl-2,2-di­oxo-3,4-dihydro-1H-2,1-benzo­thia­zin-4-yl­idene)hydrazinyl­idene]meth­yl}phenol

In the title compound, C16H14ClN3O3S, the thia­zine ring adopts a sofa (half-chair) conformation, with an r.m.s. deviation from the mean plane of 0.23 Å. The S atom and S-bonded C atom exhibit the maximum deviations from the thia­zine mean plane [−0.3976 (12) and 0.3179 (14) Å, respectively]. The conformations around the double bonds in the R 2C=N—N=CHR unit are Z and E. An intra­molecular O—H⋯N hydrogen bond with the hy­droxy group as donor generates an S(6) ring motif. In the crystal, pairs of weak C—H⋯O inter­actions connect the mol­ecules, forming inversion dimers

Methyl 2-[(methyl­sulfon­yl)(prop­yl)amino]benzoate

The asymmetric unit of the title compound, C12H17NO4S, contains two mol­ecules, both of which show disorder of the two terminal C atoms of the propyl chain over two sets of sites with an occupancy ratio of 0.581 (6):0.419 (6). Intra­molecular C—H⋯O inter­actions help to establish the mol­ecular conformations: in one mol­ecule, the dihedral angle between the methyl ester group and the benzene ring is 41.0 (2)°, whereas in the other mol­ecule it is 36.12 (17)°. In the crystal, mol­ecules are linked by inter­molecular C—H⋯O and C—H⋯π inter­actions

N′-[(E)-1-(5-Chloro-2-hy­droxy­phen­yl)ethyl­idene]pyridine-3-carbohydrazide monohydrate

In the title compound, C14H12ClN3O2·H2O, the benzene ring and the pyridine rings are oriented at a dihedral angle of 57.73 (12)° and an intra­molecular O—H⋯N hydrogen bond generates an S(6) ring. In the crystal, the water mol­ecule forms O—H⋯O and O—H⋯N hydrogen bonds to the organic mol­ecule, leading to chains containing R 4 4(16) loops. In addition, weak aromatic π–π stacking inter­actions between the centroids of pyridine rings [at distance of 3.864 (2) and 4.013 (2) Å] and C—H⋯π inter­actions occur

N′-[(E)-(1-Methyl-1H-pyrrol-2-yl)methyl­idene]benzohydrazide

In the title compound, C13H13N3O, the phenyl and pyrrole rings are inclined at 47.45 (8)°. In the crystal, inter­molecular N—H⋯O and C—H⋯O hydrogen bonds form R 2 1(6) ring motifs. Mol­ecules connected through these hydrogen bonds are arranged into polymeric chains extending along the c axis