title: 4-[(Z)-Allyl-amino-(phen-yl)methyl-ene]-3-methyl-1-phenyl-1H-pyrazol-5(4H)-one.
abstract: 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).
authors.forename: Hai-Zhen
authors.initials: HZ
authors.lastname: Xu
authors.forename: Yan-Xia
authors.initials: YX
authors.lastname: Yang
authors.forename: Jing
authors.initials: J
authors.lastname: Yan
authors.forename: You-Quan
authors.initials: YQ
authors.lastname: Zhu