(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.

3-Methyl­benzo[1,2-c:5,4-c′]dichromen-6(8H)-one

The title compound, C₂₁H₁₄O₃, crystallizes with eight independent mol­ecules (A–H) in the asymmetric unit which are arranged in four groups of two mol­ecules each (AB, CD, EF and GH). In each mol­ecule, the pyran-2-one ring is planar (r.m.s. deviations vary from 0.001 to 0.017 Å), while the pyran ring has a screw-boat conformation. In the crystal, mol­ecules stack in two columns, along the [10-1] direction, composed of mol­ecules C, B, E and G, and D, A, F and H. Mol­ecules A and F are linked via C—H...O hydrogen bonds. In addition, there are a number of C—H...π contacts present involving all of the mol­ecules. These inter­actions result in the formation of a three-dimensional network.