(E)-5-(4-Methylbenzylidene)-1-phenyl-4,5,6,7-tetrahydro-1H-indazol-4-one

Abstract

In the title compound, C21H18N2O, the non-aromatic six-membered ring adopts a distorted envelope conformation with one of the methylene-C atoms being the flap atom. The dihedral angle between the phenyl and 4-tolyl rings is 75.3 (1)°. The 1,2-diazole ring forms dihedral angles of 41.9 (1) and 65.5 (1)° with the phenyl and 4-tolyl rings, respectively. In the crystal, stabilizing C—H...O, C—H...π and π–π interactions are evident. The calculated Hirshfeld surfaces highlight the prominent role of C—H...O interactions (8.6%), along with H...H (51.7%) and C...H/H...C (29.2%) surface contacts.