3,5-Dimethyl-1-phenyl-1H-pyrazole-4-carbaldehyde

In the title molecule, C12H12N2O, the five- and six-membered rings form a dihedral angle of 68.41 (16)°. The aldehyde group is nearly coplanar with the pyrazole ring [C—C—C—O torsion angle = −0.4 (5)°]. The three-dimensional architecture is sustained by weak C—H⋯O and C—H⋯π interactions.

In the title molecule, C 12 H 12 N 2 O, the five-and six-membered rings form a dihedral angle of 68.41 (16) . The aldehyde group is nearly coplanar with the pyrazole ring [C-C-C-O torsion angle = À0.4 (5) ]. The three-dimensional architecture is sustained by weak C-HÁ Á ÁO and C-HÁ Á Á interactions.
In (I), Fig. 1, there is a twist about the single bond linking the five-and six-membered rings with the N2-N1-C7-C8 torsion angle being -112.1 (3) °; the dihedral angle between the rings is 68.41 (16) °. The aldehyde group is co-planar with the pyrazole ring to which it is connected as seen in the value of the C2-C3-C6-O1 torsion angle of -0.4 (5)°.
Molecules are connected into the three-dimensional architecture by C-H···O and C-H···π interactions, Fig. 2 and Table 1.

Refinement
Carbon-bound H-atoms were placed in calculated positions [C-H = 0.95 to 0.98 Å, U iso (H) = 1.2 to 1.5U eq (C)] and were included in the refinement in the riding model approximation. Owing to poor agreement, the (2 1 0) reflection was omitted from the final cycles of refinement.

Figure 2
A view in projection down the a axis of the unit-cell contents of (I). The C-H···O and C-H···π interactions are shown as orange and purple dashed lines, respectively.