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In the title compound, C16H9Cl2N5O2, the folded mol­ecular conformation is characterized by a dihedral angle between the two benzene rings of 74.03 (5)°. An intra­molecular N—H...O hydrogen bond is observed between the H atom of the amide group and a nitro-group O atom. Inter­molecular C—H...O and N—H...N hydrogen bonds feature in the crystal packing.

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In the title compound, C20H11Cl2F4N3, the central pyrazolo­[1,5-a]pyrimidine unit is almost planar [the mean deviation from the best least-square plane through the nine atoms is 0.006 (2) Å]. The fluoro­benzene ring is rotated out of this plane by 10.3 (3)°, whereas the dichloro­benzene ring is rotated by 46.2 (3)°. The crystal packing is dominated by Cl...Cl inter­actions of 3.475 (3) Å and van der Waals inter­actions.

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In the title compound, C25H13Cl2F4N3, there are four planar systems, viz. three benzene rings and a pyrazolo­[1,5-a]pyrim­idine system [r.m.s. deviation = 0.002 Å]. The dihedral angle between the dichloro­phenyl ring and the unsubstituted phenyl ring is 69.95 (5)°, while that between the fluoro­phenyl ring and the unsubstituted phenyl ring is 7.97 (10)°. The crystal packing is dominated by van der Waals inter­actions. A Cl...Cl inter­action of 3.475 (3) Å also occurs.

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In the title compound, C34H41N7O5·4H2O (systematic name: ethyl 3-{[2-({4-[(Z)-amino­(hexyl­oxycarbonyl­imino)­meth­yl]anilino}meth­yl)-1-meth­yl­benzimidazole-5-carbon­yl]pyridin-2-yl­amino}­propano­ate tetra­hydrate), the benzene and pyridine rings form dihedral angles of 5.4 (1) and 43.8 (1)°, respectively, with the benzimidazole mean plane. The terminal butyl group is disordered over two conformations in a 0.756 (10):0.244 (10) ratio. There is an intramolecular N—H...O hydrogen bond present. In the crystal, the water mol­ecules are involved in the formation of O—H...O, O—H...N and N—H...O hydrogen bonds, which link the components into layers parallel to the ab plane.
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