Research Article: (4Z)-4-[(2-Chloro­anilino)(phen­yl)methyl­idene]-3-methyl-1-phenyl-1H-pyrazol-5(4H)-one

Date Published: June 01, 2012

Publisher: International Union of Crystallography

Author(s): Li-Ying Xu, Ning Li, Jia-Min Li, Heng-Qiang Zhang, Zhen-Hai Sun.


The title compound, C23H18ClN3O, exists in an enamine–keto form with the amino group involved in an intra­molecular N—H⋯O hydrogen bond. The five-membered ring is nearly planar, the largest deviation being 0.0004 (7) Å, and makes dihedral angles of 16.62 (6), 41.89 (5) and 71.27 (4)° with the phenyl rings. In the crystal, weak C—H⋯O hydrogen bonds link the mol­ecules into supra­molecular chains along the b axis.

Partial Text

For general background to Schiff bases derived from 1-phenyl-3-methyl-4-benzoyl-1H-pyrazol-5(4H)-one and their pharmaceutical and agrochemical applications, see: Casas et al. (2007 ▶); Zhang et al. (2008 ▶). For related structures, see: Zhang et al. (2007 ▶); Li et al. (2009 ▶); Chi et al. (2010 ▶).




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