Xu, Li-Ying published the artcile(4Z)-4-[(2-Chloroanilino)(phenyl)methylidene]-3-methyl-1-phenyl-1H-pyrazol-5(4H)-one, Synthetic Route of 4551-69-3, the publication is Acta Crystallographica, Section E: Structure Reports Online (2012), 68(6), o1843, database is CAplus and MEDLINE.
The title compound, C23H18ClN3O, exists in an enamine-keto form with the amino group involved in an intramol. 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 Ph rings. In the crystal, weak C-H···O hydrogen bonds link the mols. into supramol. chains along the b axis. Crystallog. data are given.
Acta Crystallographica, Section E: Structure Reports Online published new progress about 4551-69-3. 4551-69-3 belongs to pyrazoles-derivatives, auxiliary class Benzenes, name is 4-Benzoyl-5-methyl-2-phenyl-2,4-dihydro-3H-pyrazol-3-one, and the molecular formula is C17H20ClN3, Synthetic Route of 4551-69-3.
Referemce:
https://en.wikipedia.org/wiki/Pyrazole,
Pyrazoles – an overview | ScienceDirect Topics