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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.

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The title compound, C21H14O3, crystallizes with eight independent mol­ecules (AH) 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.

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In the title compound, C24H14Cl2N2O2S, the 2H-chromene ring system is approximately planar, with a maximum deviation of 0.025 (2) Å. The thia­zole ring is almost planar, with an r.m.s. deviation of 0.0022 Å, and makes a dihedral angle of 58.52 (7)° with the chromene ring system. The chromene ring system is inclined at angles of 58.3 (1) and 55.39 (9)° with respect to the two chloro­phenyl rings. The two chloro­phenyl rings show significant deviation from coplanarity, with a dihedral angle between them of 47.69 (8)°. The crystal structure features C—H...Cl inter­actions extending in (100) and propagating along the a-axis direction and weak π–π inter­actions [centroid–centroid separation = 3.867 (2) Å].
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