Crystal Structure of 1,5-Dimethyl-4-(2-oxo-1,2-diphenyl-ethylidene amino)-2-phenyl-1,2-dihydro-pyrazol-3-one

The crystal structure of the title compound is determined by single crystal X-ray structure analysis. The structure was solved by direct method and refined by full-matrix least-squares procedures to a final R -value of 0.0441 for 2755 observed reflections. In the molecule, the plane of ethylideneamino moiety forms dihedral angles of 22.37° with the mean plane of pyrazolone ring and 72.23° with the plane of carbonyl group. Pyrazolone cycle has the envelope conformation with asymmetry parameter ∆C S (N1) = 0.65. The structure is stabilized by C–H···O and C–H···π intermolecular interactions.