organic compounds
The title compound, C11H9Br3, consists of a norbornane skeleton, composed of two five-membered rings in envelope conformations and a six-membered ring with three Br atoms held in a boat conformation by a bridging methylene group, which constitutes a bicyclo[2.2.1]heptane system, having a benzene ring fused on one side. The repulsive interactions between the Br atoms affect the topology of the norbornane skeleton.
organic compounds
In the title compound, C10H7Br5O, prepared by bromination of 5-methoxyindane, all bond lengths and angles are in the usual ranges. However, the relatively wide range of Br-C-C angles [107.2 (5)-117.0 (4)°] in the five-membered ring may indicate repulsion between the neighbouring Br atoms. The crystal packing is stabilized by van der Waals interactions.
organic compounds
The title compound, C12H13ClN2O3, adopts a keto–hydrazo tautomeric form stabilized by an intramolecular N—HO hydrogen bond. The configuration around the C=N bond is trans. The dihedral angle between the aromatic ring and the aliphatic chain is 5.52 (9)°. Symmetry-related molecules are linked via C—HO hydrogen bonds to form chains along the b axis.
organic compounds
The title compound, C12H12ClFN2O3, adopts a keto–hydrazo tautomeric form stabilized by an intramolecular N—HO hydrogen bond. The whole molecule is roughly planar, the largest deviation from the mean plane being 0.328 (3) Å for the terminal methyl C atom of the ethyl side chain.
organic compounds
The title compound, C13H15ClN2O4, adopts a keto–hydrazo tautomeric form stabilized by intramolecular N—HO hydrogen bonds. The phenylhydrazone fragment is planar within ±0.028 (2) Å. The dihedral angle between the phenylhydrazone and oxobutanoate planes is 8.15 (9)°. Symmetry-related molecules are linked via C—HO hydrogen bonds to form chains along [101].
organic compounds
The title compound, C12H12Cl2N2O3, adopts a keto-hydrazo tautomeric form stabilized by an intramolecular hydrogen bond. The molecule can be considered as consisting of two connected fragments, viz. a chlorophenylhydrazone group, with a Z configuration, and an oxobutanoate group. The molecule is roughly planar, the dihedral angle between the benzene ring and the plane including the aliphatic chain being 4.7 (2)°.
organic compounds
The molecule of the title compound, C19H20F3N3O5, at 150 K, is nearly planar and exists in the keto–amine (N—HO) tautomeric form, with a strong intramolecular hydrogen bond of 2.585 (2) Å between the O and N atoms. The configuration around the azo –N=N– double bond is trans, as found for other diazene derivatives, and the dihedral angle between the planes of the two aromatic rings is 7.81 (4)°.
organic compounds
The title compound, C22H29N3O5, is approximately planar with the aromatic rings in a trans configuration with respect to the azo double bond. The eneamine portion of the molecule exists as the keto–amine tautomer, stabilized by a strong intramolecular N—HO hydrogen bond. Intramolecular N—HO and O—HO and intermolecular O—HO and C—HO interactions influence the conformation of the molecules and the crystal packing.