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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.

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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.

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The title compound, C12H13ClN2O3, adopts a keto–hydrazo tautomeric form stabilized by an intra­molecular N—H...O 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—H...O hydrogen bonds to form chains along the b axis.

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The title compound, C12H12ClFN2O3, adopts a keto–hydrazo tautomeric form stabilized by an intra­molecular N—H...O 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.

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The title compound, C13H15ClN2O4, adopts a keto–hydrazo tautomeric form stabilized by intra­molecular N—H...O 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—H...O hydrogen bonds to form chains along [101].

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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)°.

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The mol­ecule of the title compound, C19H20F3N3O5, at 150 K, is nearly planar and exists in the keto–amine (N—H...O) 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)°.

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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—H...O hydrogen bond. Intra­molecular N—H...O and O—H...O and inter­molecular O—H...O and C—H...O inter­actions influence the conformation of the mol­ecules and the crystal packing.
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