(E)-4-(2,3-Dihydro-1,3-benzothia­zol-2-yl­idene)-3-methyl-1-phenyl-1H-pyrazol-5(4H)-one

In the title compound, C17H13N3OS, the dihedral angle between the ring systems is 2.22 (5)°. The N—H grouping participates in both intra- and intermolecular N—H⋯O hydrogen bonds, the latter leading to dimers related by a twofold rotation axis

4-(1,3-Benzothia­zol-2-yl)-5-methyl-2-phenyl-1-propynyl-1H-pyrazol-3(2H)-one

The title compound, C20H15N3OS, is a 1H-pyrazol-3(2H)-one having aromatic 4-(1,3-benzothia­zol-2-yl) and 2-phenyl substit­uents. The five-membered ring and the fused-ring system are close to planar, the r.m.s. deviations being 0.025 and 0.005 Å, respectively. The five-membered ring is aligned at 67.5 (1)° with respect to the phenyl ring and at 4.7 (1)° with respect to the fused-ring system. In the crystal, adjacent mol­ecules are linked through the acetyl­enic H atom by a C—H⋯O hydrogen bond into C(8) chains propagating in [010]

1-Allyl-4-(1,3-benzothia­zol-2-yl)-5-methyl-2-phenyl-1H-pyrazol-3(2H)-one

The title compound, C20H17N3OS, is a 1H-pyrazol-3(2H)-one having aromatic 4-(1,3-benzothia­zol-2-yl)- and 2-phenyl substituents. The five-membered ring and fused ring system are planar, the r.m.s. deviations being 0.021 and 0.005 Å, respectively. The five-membered ring is aligned at 7.9 (2)° with respect to the fused-ring system. The allyl and phenyl parts of the mol­ecule are both disordered over two positions in a 1:1 ratio. Weak inter­molecular C—H⋯O hydrogen bonding is present in the crystal structure

1-(1-Decyl-2-oxoindolin-3-yl­idene)thio­semicarbazide

In the title 1-alkyl­isatin 3-thio­semicarbazone, C19H28N4OS, the imine C=N bond has a Z configuration, whereas the N—N—C=S unit has an E conformation. In the crystal, mol­ecules are connected by N—H⋯O hydrogen bonds, forming zigzag chains running along the b axis

1-(1-Nonyl-2-oxoindolin-3-yl­idene)thio­semicarbazide

In the title compound, C18H26N4OS, the imine C=N bond has a Z configuration, whereas the N—N—C=S unit has an E conformation. In the crystal, mol­ecules are connected through N—H⋯O hydrogen bonds, forming zigzag chains running along the b axis. The nonyl chain adopts an extended zigzag conformation

4-(1,3-Benzothia­zol-2-yl)-1,5-dimethyl-2-phenyl-1H-pyrazol-3(2H)-one

The central five-membered ring of the title compound, C18H15N3OS, is almost planar (r.m.s. deviation = 0.028 Å) and the benzothia­zole fused-ring system is close to coplanar with this ring [dihedral angle = 6.1 (1)°]. The phenyl substituent is twisted by 62.5 (1)°