Synthesis and Single Crystal X-Ray Structure of 3,5-Diphenyl-1-(phenylacetyl)-4,5-dihydro-1H-pyrazol

Abstract

The molecule of the title pyrazole derivative, 3,5-diphenyl-1-(phenylacetyl)-4,5-dihydro-1H-pyrazol, C₂₃H₂₀N₂O, is twisted. The compound crystallizes in the monoclinic sp. gr. I2/a with a = 15.3502(13) Å, b = 12.7576(8) Å, c = 19.625(2) Å, β = 106.639(7)°, and Z = 8. In the compound, the phenyl rings form dihedral angles of 12.01(13)°, 80.36(8)°, and 86.95(9)° with the mean plane of the pyrazole ring (r.m.s. deviation = 0.030 Å). The central pyrazole ring, which approximates an envelope conformation, is almost coplanar with one of the phenyl rings. The crystal packing is stabilized by weak intermolecular C–H···O hydrogen bonds.