The title compound, C(20)H(19)N(3)O, exists in a keto-enamine tautomeric form. The pyrazolone ring makes dihedral angles of 20.52 (10) and 77.73 (5)° with the two phenyl rings and an intra-molecular N-H⋯O hydrogen bond occurs. A weak inter-molecular C-H⋯O hydrogen bond is observed in the crystal structure. The allyl group is disordered over two positions, with site-occupancy factors of 0.533 (5) and 0.467 (5).

DOI: 10.1107/S160053681001384X

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@inproceedings{Xu20104ZAllylaminophenylmethylene3methyl1phen, title={4-[(Z)-Allyl­amino­(phen­yl)methyl­ene]-3-methyl-1-phenyl-1H-pyrazol-5(4H)-one}, author={Hai-zhen Xu and Yan-Xia Yang and Jing Yan and You-Quan Zhu}, booktitle={Acta crystallographica. Section E, Structure reports online}, year={2010} }