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In the title compound, C17H13NO3, the dihedral angle between the benzene rings is 31.21 (5)°. In the crystal, inversion dimers linked by pairs of C—H...O hydrogen bonds occur. A C—H...π inter­action is also indicated.

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In the title compound, C11H13N3O, the phenyl ring is disordered over two sites, with occupancy factors in a 0.520 (17):0.480 (17) ratio. The dihedral angle between the ring planes of the major and minor components of the disordered ring is 12.9 (2)°. In the crystal, mol­ecules are linked by N—H...O hydrogen bonds, forming R22(8) ring motifs. C—H...O, C—H...N and C—H...π inter­actions also occur.

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In the title compound, C21H16F2O2, the central benzene ring is inclined at dihedral angles of 30.91 (8) and 46.88 (7)° to the two terminal fluoro-substituted rings. The dihedral angle between the two terminal fluoro-subsituted rings is 68.34 (8)°. An intra­molecular C—H...O hydrogen bond generates an S(6) ring motif. The crystal structure is stabilized by weak C—H...π inter­actions.

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In the title compound, C22H18F2O3, the two fluoro-substituted rings form dihedral angles of 25.89 (15) and 55.00 (12)° with the central benzene ring. The eth­oxy group in the mol­ecule is disordered over two positions with a site-occupancy ratio of 0.662 (7):0.338 (7). In the crystal, mol­ecules are linked by C—H...O hydrogen bonds into chains along the a axis. The crystal packing is further stabilized by C—H...π and π—π inter­actions, with centroid–centroid distances of 3.8605 (15) Å.
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