3-Methyl-benzo[1,2-c:5,4-c']dichromen-6(8H)-one

Abstract

The title compound, C21H14O3, crystallizes with eight independent mol-ecules (A-H) in the asymmetric unit which are arranged in four groups of two mol-ecules each (AB, CD, EF and GH). In each mol-ecule, 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, mol-ecules stack in two columns, along the [10-1] direction, composed of mol-ecules C, B, E and G, and D, A, F and H. Mol-ecules 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 mol-ecules. These inter-actions result in the formation of a three-dimensional network.

Keywords: crystal structure.

Fig. 1.

The molecular structure of molecules A and B of the title compound, with atom labelling. The displacement ellipsoids are drawn at the 50% probability level.

Fig. 2.

The molecular structure of molecules C and D of the title compound, with atom labelling. The displacement ellipsoids are drawn at the 50% probability level.

Fig. 3.

The molecular structure of molecules E and F of the title compound, with atom labelling. The displacement ellipsoids are drawn at the 50% probability level.

Fig. 4.

The molecular structure of molecules G and H of the title compound, with atom labelling. The displacement ellipsoids are drawn at the 50% probability level.

Fig. 5.

Crystal packing of the title compound viewed along the b axis, showing the C—H···O hydrogen bonds as dashed lines (see Table 1 for details).

Fig. 6.

Crystal packing of the title compound viewed along the b axis, showing the C—H···π interactions as dashed lines (see Table 1 for details).