5-Methyl-4-(5-methyl-3-oxo-2-phenyl-2,3-dihydro-1H-pyrazol-4-yl)-2-phenyl-1H-pyrazol-3(2H)-one

Abstract

The title compound, C20H18N4O2, known as bispyrazolone, was crystallized from dimethyl sulfoxide. The structure has orthorhombic (Pbca) symmetry at 150 K, and displays both intra- and intermolecular hydrogen bonding through C—H...O and N—H...O contacts, respectively. None of the phenyl and pyrazolone rings in the molecule are coplanar. The dihedral angle between the pyrazolone rings is 66.18 (5)°.