N′-[(4Z)-1-(3-Methyl-5-oxo-1-phenyl-4,5-dihydro-1H-pyrazol-4-ylidene)hexyl]benzenesulfonohydrazide

In the title compound, C22H26N4O3S, the dihedral angle between the pyrazoloneand phenyl rings is 21.73 (4)°. The benzensulfonohydrazide group adopts a gauche conformation about the N—N vector. The C—N—N—S torsion angle is −109.88 (13)°. The molecule exists as the enamine tautomeric form (C=C—NH). An intramolecular N—H⋯O=C hydrogen bond occurs. In the crystal, molecules are linked by pairs of N—H⋯O=C hydrogen bonds, forming centrosymmetric dimers.

In the title compound, C 22 H 26 N 4 O 3 S, the dihedral angle between the pyrazoloneand phenyl rings is 21.73 (4) . The benzensulfonohydrazide group adopts a gauche conformation about the N-N vector. The C-N-N-S torsion angle is À109.88 (13). The molecule exists as the enamine tautomeric form (C C-NH). An intramolecular N-HÁ Á ÁO C hydrogen bond occurs. In the crystal, molecules are linked by pairs of N-HÁ Á ÁO C hydrogen bonds, forming centrosymmetric dimers.
Crystals suitable for X-ray crystallographic analysis were obtained by slow dissolution of the compound in ethanol by warming, and addition of few drops of dimethyl sulphoxide (DMSO), followed by slow evaporation of the solvent at room temperature for 11 days.

Refinement
Hydrogen atoms were placed in calculated positions with C-H = 0.93 -0.97 Å and refined using a riding model with fixed isotropic displacement parameters: Uiso(H) = 1.2 Ueq(C) for aromatic and methylene groups, Uiso(H) = 1.5 Ueq(C) for methyl group, except for the two N-H hydrogen atoms which were located in a penultimate difference map and refined with free x, y, z, Uiso parameters.

Refinement
Crystal data, data collection and structure refinement details are summarized in Table 1.

Figure 1
The molecular structure and atom numbering of the title compound with displacement parameters drawn at the 50% probability level for non-H atoms.