N-(1,5-Dimethyl-3-oxo-2-phenyl-2,3-dihydro-1H-pyrazol-4-yl)-2-phenylacetamide
The title compound, C19H19N3O2, crystallizes with two independent molecules (AandB) in the asymmetric unit. In moleculeA, the pyrazole ring adopts a slightly disordered half-chair conformation while inBit is planar [r.m.s. deviation = 0.0386 (15) Å]. The dihedral angle between the mean planes of the two phenyl rings is 56.2 (8) inAand 38.2 (3)° inB. TheN-phenyl substituent on the pyrazole ring is twisted by 46.5 (2) inAand 58.6 (4)° inBwhile the extended phenyl ring is twisted by 82.2 (8) inAand 87.5 (9)° inB. The mean plane of the amide group forms an angle of 74.8 (3) inAand 67.7 (1)° inBwith respect to the phenyl ring. In addition, the amide group is rotated by 51.4 (1) inAand 53.6 (2)° inBfrom the the mean plane of the pyrazole ring. In the crystal, the two molecules are linkedviaN—H...O hydrogen bonds, supported by weak C—H...O interactions, forming dimers enclosing anR22(10) ring motif. The dimers are linkedviaC—H...O interactions, forming a three-dimensional structure.