6-Bromo-1-methyl-4-[2-(1-phenyl­ethyl­idene)hydrazinyl­idene]-3,4-dihydro-1H-2λ⁶,1-benzothia­zine-2,2-dione

In the title compound, C₁₇H₁₆BrN₃O₂S, the dihedral angle between the aromatic rings is 1.24 (15)° and the C=N—N=C torsion angle is 167.7 (3)°. The conformation of the thia­zine ring is an envelope, with the S atom displaced by 0.805 (3) Å from the mean plane of the other five atoms (r.m.s. deviation = 0.027 Å). In the crystal, C—H...O inter­actions link the mol­ecules into C(10) [010] chains. A weak C—H...π inter­action is also observed.

3-Chloro-1-methyl-4-[2-(3-phenyl­allyl­idene)hydrazinyl­idene]-3,4-dihydro-1H-2λ⁶,1-benzothia­zine-2,2-dione

In the title compound, C₁₈H₁₆ClN₃O₂S, the dihedral angle between the aromatic rings is 4.81 (2)° and the alkyl chain takes on an extended conformation [N—C—C—C = 179.2 (4)°]. The conformation of the thia­zine ring is an envelope, with the S atom displaced by −0.805 (3) Å from the mean plane of the other five atoms (r.m.s. deviation = 0.046 Å). The Cl atom is an axial conformation and is displaced by 1.761 (4) Å from the thia­zine ring plane. In the crystal, inversion dimers linked by pairs of C—H...O inter­actions generate R₂²(20) loops and further C—H...O hydrogen bonds link the dimers into (001) sheets. Weak aromatic π–π stacking inter­actions [centroid–centroid separations = 3.870 (3) and 3.883 (3) Å] are also observed.

1-Ethyl-4-{2-[1-(4-methyl­phen­yl)ethyl­idene]hydrazinyl­idene}-3,4-dihydro-1H-2λ⁶,1-benzothia­zine-2,2-dione

In the title compound, C₁₉H₂₁N₃O₂S, the dihedral angle between the aromatic rings is 6.7 (2)° and the C=N—N=C torsion angle is 178.0 (2)°. The conformation of the thia­zine ring is an envelope, with the S atom displaced by 0.802 (2) Å from the mean plane of the other five atoms (r.m.s. deviation = 0.022 Å). In the crystal, mol­ecules are linked by C—H...O inter­actions, generating C(5) chains propagating in [010]. A weak C—H...π inter­action is also observed.

Methyl 2,4-dihy­droxy-5-(4-nitro­benzamido)­benzoate

In the title compound, C₁₅H₁₂N₂O₇, the dihedral angle between the aromatic rings is 4.58 (13)° and the nitro group is rotated from its attached ring by 18.07 (17)°. Intra­molecular N—H...O and O—H...O hydrogen bonds generate S(5) and S(6) rings, respectively. In the crystal, mol­ecules are linked by O—H...O hydrogen bonds, generating [001] C(7) chains. The chains are linked by C—H...O inter­actions, forming a three-dimensional network, which incorporates R₂²(7) and R₂²(10) loops.

Ethyl N-(2-benzoyl-3-oxo-3-phenyl­propano­yl)carbamate

In the title compound, C₁₉H₁₇NO₅, the dihedral angle between the phenyl groups is 79.55 (15)°. The terminal eth­oxy group is disordered over two orientations in a 0.873 (6):0.127 (6) ratio. In the crystal, mol­ecules are linked by N—H...O and C—H...O hydrogen bonds into [001] chains which incorporate R₁²(6) loops. A very weak C—H...π contact also occurs.

Methyl 2,4-dihy­droxy-5-(2-methyl­propanamido)­benzoate

In the title compound, C₁₂H₁₅NO₅, the dihedral angle between the benzene ring and the C atoms of the terminal isopropyl group is 83.48 (16)°. Intra­molecular N—H...O and O—H...O hydrogen bonds generate S(5) and S(6) rings, respectively. In the crystal, mol­ecules are linked by O—H...O hydrogen bonds, generating C(7) chains propagating in [001]. Weak aromatic π–π stacking [centroid–centroid separation = 3.604 (3) Å] is also observed.

4-(1-Methyl­eth­yl)-N-((E)-4-{[1-(prop-2-en-1-yl)-1H-1,2,3-triazol-4-yl]meth­oxy}benzyl­idene)aniline

In the title compound, C₂₂H₂₄N₄O, the terminal and central benzene rings make dihedral angles of 52.7 (3) and 43.8 (2)°, respectively, with the triazole ring. The dihedral angle between the benzene rings is 8.9 (2)°. The crystal structure features C—H...π inter­actions. The atoms of the terminal propenyl group are disordered over two sets of sites, with a refined occupancy ratio of 0.714 (14):0.286 (14).