(E)-1-([1,1′-Biphenyl]-4-yl)-3-(2-methylphenyl)prop-2-en-1-one

In the title molecule, C22H18O, the o-tolyl ring is connected through a conjugated double bond. The molecule adopts an E conformation and the C—C=C—C torsion angle is 178.77 (13)°. The overall conformation may be described by the values of dihedral angles between the different planes. The terminal rings are twisted by an angle of 54.75 (8)°, while the biphenyl part is not planar, the dihedral angle between the planes of the rings being 40.65 (8)°. The dihedral angle between the benzene rings is 14.10 (7)°. There are three weak C—H⋯π interactions found in the crystal structure. No classic hydrogen bonds are observed.

In the title molecule, C 22 H 18 O, the o-tolyl ring is connected through a conjugated double bond. The molecule adopts an E conformation and the C-C C-C torsion angle is 178.77 (13) . The overall conformation may be described by the values of dihedral angles between the different planes. The terminal rings are twisted by an angle of 54.75 (8) , while the biphenyl part is not planar, the dihedral angle between the planes of the rings being 40.65 (8) . The dihedral angle between the benzene rings is 14.10 (7) . There are three weak C-HÁ Á Á interactions found in the crystal structure. No classic hydrogen bonds are observed.
No classic hydrogen bonds are observed.

Experimental
Biphenyl acetone (1.06 g, 10 mmol) and 2-methylbenzaldehyde (1.06 g, 10 mmol) in ethanol (25 ml) is mixed in the presence of NaOH (10 ml 30%). The reaction mixture was stirred for 6 h. Then the contents of the flask were poured into ice cold water (250 ml) and left for 12 h. The solid obtained was filtered and recrystallized for three to four times with ethanol. The colourless single crystals of the title compound used for X-ray diffraction studies were grown by slow evaporation of acetone. Yield: 1.48 g (70%).

Refinement
All H-atoms were positioned geometrically and allowed to ride on their parent atoms, with C-H = 0.93 Å (aromatic), 0.96 Å (methyl group), with U iso (H) = 1.2 or 1.5U eq (C); for aromatic and methyl group.  The molecular structure of the title compound, with displacement ellipsoids drawn at the 30% probability level. H atoms are shown as small spheres of arbitrary radius.

Figure 2
The partial packing of the title compound, showing the three weak C-H···π interactions.