Acta Cryst. (2009). E65, o2116  [ doi:10.1107/S160053680902950X ]

4-{(Z)-(sec-Butylamino)(phenyl)methylene}-3-methyl-1-phenyl-1H-pyrazol-5(4H)-one

H.-Z. Xu, J.-P. Xu, Y.-W. Yuan, J. Zhang and Y.-Q. Zhu

Abstract: In the title compound, C₂₁H₂₃N₃O, the dihedral angles formed by the pyrazolone ring with two phenyl rings are 10.38 (8) and 76.94 (6)°. The sec-butylamino group is disordered over two positions, with refined site-occupancy factors of 0.730 (4) and 0.270 (4). The compound could potentially be ligand stabilized in the solid state in a keto-enamine tautomeric form. The amine functionality is involved in an intramolecular N-HO hydrogen bond, while weak intermolecular C-HO and C-HN hydrogen bonds participate in the formation of the crystal structure.

Online 8 August 2009

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