Acta Cryst. (2003). E59, o430-o432  [ doi:10.1107/S1600536803004914 ]

4-{[3,4-Dihydro-5-methyl-3-oxo-2-phenyl-2H-pyrazol-4-ylidene](phenyl)methylamino}-1,5-dimethyl-2-phenyl-1H-pyrazol-3(2H)-one

J.-L. Wang, Y. Yang, X. Zhang and F.-M. Miao

Abstract: In the title compound, C₂₈H₂₅N₅O₂, the carbonyl group of the 5-methyl-2-phenylpyrazol-3-one moiety, the adjacent double bond and the amine N atom of antipyrine are essentially coplanar, the largest deviation from the mean plane being 0.049  (2)  Å. The compound is a neutral tridentate ligand in an enamine-keto tautomeric form, due to a strong intramolecular N-HO hydrogen bond. The dihedral angle between the two pyrazolone rings is 86.2  (3)°, reducing steric hindrance.

Online 14 March 2003

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