Received 8 July 2009
aCollege of Chemistry and Life Science, Tianjin Normal University, Weijin Road No. 241, Tianjin, People's Republic of China,bElementary Education College, Tianjin Normal University, Weijin Road No. 241, Tianjin, People's Republic of China, and cState Key Laboratory of Elemento-Organic Chemistry, Nankai University, Tianjin 300071, People's Republic of China
Correspondence e-mail: email@example.com
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.
Data collection: CrystalClear (Rigaku, 2005); cell refinement: CrystalClear; data reduction: CrystalClear; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL.
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: BH2238 ).
The authors gratefully acknowledge financial support from the National Natural Science Foundation of China (grant No. 20772066).
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