1-{3-(4-Chlorophenyl)-5-[4-(propan-2-yl)phenyl]-4,5-dihydro-1H-pyrazol-1-yl}butan-1-one

In the title compound, C22H25ClN2O, the pyrazole ring exhibits an envelope conformation with the methine C atom as the flap. The benzene rings are twisted by 3.3 (5) and 84.6 (5)° from the pyrazole mean plane, and are inclined to each other by 81.4 (4)°. In the crystal, pairs of weak C—H⋯O hydrogen bonds form centrosymmetric dimers with an R 2 2(16) graph-set motif. C—H⋯π interactions link the dimers into columns propagating in [100].

In the title compound, C 22 H 25 ClN 2 O, the pyrazole ring exhibits an envelope conformation with the methine C atom as the flap. The benzene rings are twisted by 3.3 (5) and 84.6 (5) from the pyrazole mean plane, and are inclined to each other by 81.4 (4) . In the crystal, pairs of weak C-HÁ Á ÁO hydrogen bonds form centrosymmetric dimers with an R 2 2 (16) graph-set motif. C-HÁ Á Á interactions link the dimers into columns propagating in [100].
In the crystal, a weak C-H···O intermolecular interaction between the phenyl ring and the butan-1-one group is observed forming dimers in an R 2 2 [16] ring-set motif (Fig. 2). In addition, weak C-H···π intermolecular stacking interactions (Table 1) are also present and link further these dimers into columns propagated in [100].

Refinement
All H atoms were placed in their calculated positions and refined using the riding model with C-H of 0.95 -1.00 Å.
Isotropic displacement parameters for H atoms were set to 1.2-1.5 times U eq of the parent atom. The idealised Me was refined as a rotating group.  The molecular structure of (I) showing the labeling scheme and 30% probability displacement ellipsoids.   Synthesis of (I).

sup-4
Acta Cryst. (2014). E70, o761-o762 where P = (F o 2 + 2F c 2 )/3 (Δ/σ) max < 0.001 Δρ max = 0.36 e Å −3 Δρ min = −0.29 e Å −3 Special details Geometry. All esds (except the esd in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell esds are taken into account individually in the estimation of esds in distances, angles and torsion angles; correlations between esds in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell esds is used for estimating esds involving l.s. planes.