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The title compound, C13H11NO3, adopts the keto–amine tautomeric form, with the H atom located on N rather than on O. This H atom is involved in a strong intra­molecular hydrogen bond. There are two independent molecules in the asymmetric unit. The mol­ecules are linked by intra­molecular N—H...O and O—H...O and inter­molecular O—H...O hydrogen bonds into a three-dimensional network.

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The title compound, C12H12N3O5, adopts a keto-hydrazo tautomeric form stabilized by intra­molecular hydrogen bonds. The aromatic ring and aliphatic chain, which adopt a trans configuration about the C=N double bond, are nearly coplanar, with a dihedral angle of 7.56 (1)° between them. The mol­ecules pack via weak inter­molecular C—H...O hydrogen bonds which, together with intra­molecular N—H...O bonds, form an S(6)S(6)[R22(13)]S(6)S(6) motif.

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The title compound, C12H12N3O5, adopts a keto-hydrazo tautomeric form stabilized by an intra­molecular hydrogen bond. The aromatic ring and aliphatic chain, which adopt a trans configuration about the N—N bond, are nearly coplanar, with a dihedral angle of 18.30 (6)° between them. The mol­ecules pack via weak inter­molecular C—H...O hydrogen bonds which, together with an intra­molecular N—H...O bond, form an S(6)C(13) motif. The structure is further stabilized by C—H...π and π–π inter­actions.

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The title compound, C19H23N3O4, adopts the keto-amine tautomeric form, with the H atom located on N rather than on O. This H atom is involved in a strong intra­molecular hydrogen bond. The configuration around the azo N=N double bond is trans and the dihedral angle between the two aromatic rings is 8.94 (2)°. The mol­ecules, with intra­molecular N—H...O hydrogen bonding, are linked by intermolecular O—H...O hydrogen bonds, forming a three-dimensional network.

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The title compound, C14H12N2O4, exists as an enol–imine tautomer, in which a strong intra­molecular O—H...N hydrogen bond is formed. This study verifies the preference of the enol–imine tautomeric form in the solid state.

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The title compound, C15H14N2O4, exists as an enol–imine tautomer, in which a strong intra­molecular O—H...N hydrogen bond is formed. This work verifies the preference for the enol–imine tautomeric form in the solid state.

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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, C22H30ClO2PS, displays distorted tetrahedral geometry around the P atom. The dihedral angle between the benzene rings is 43.7 (4)°. The aromatic rings have unusual endocyclic angles as a result of the steric effects of the tert-butyl groups. The mol­ecules are linked by weak C—H...π interactions.

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The title compound, C22H30ClO4PS, displays distorted tetra­hedral geometry around the P atom. The dihedral angle between the benzene rings is 41.2 (2)°. Because of the steric effects of the tert-but­yl groups, the aromatic rings have unusual endocyclic angles. The mol­ecules are linked by weak C—H...π inter­actions.

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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, C14H13N1O3, adopts the keto–amine tautomeric form, with an intra­molecular N—H...O resonance-assisted hydrogen bond. The two benzene rings are nearly coplanar [dihedral angle = 14.3 (2)°]. The mol­ecules are linked by inter­molecular O—H...O hydrogen bonds and C—H... π inter­actions between meth­yl groups and benzene rings.

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The mol­ecule of the title compound, C17H13NO2, is nearly planar and exists in the keto–amine (N—H...O) tautomeric form, with a strong intra­molecular hydrogen bond of 2.576 (2) Å between the O and N atoms. The mol­ecules are linked by O—H...O hydrogen bonds to form dimers, and are further linked by C—H...π inter­actions, forming a three-dimensional network.

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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 molecule of the title compound, C13H9ClN2O2, is approximately planar and displays a trans configuration with respect to the central N=N double bond. The dihedral angle between the two aromatic rings is 3.69 (14)°. The mol­ecules are linked by inter­molecular O—H...O hydrogen bonds, forming a two-dimensional network.

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The molecule of the title compound, C13H9BrN2O2, is approximately planar and displays a trans configuration with respect to the N=N double bond. The dihedral angle between the two aromatic rings is 3.65 (16)°. The mol­ecules are linked by inter­molecular O—H...O hydrogen bonds, forming a two-dimensional network.

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The molecule of the title compound, C15H14N2O2, is approximately planar and displays a trans configuration with respect to the N=N double bond. The dihedral angle between the two aromatic rings is 10.90 (14)°. The mol­ecules are stacked via weak C—H...π inter­actions.

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The title compound, C14H11FN2O3, displays the characteristic features of azobenzene derivatives. Intra­molecular O—H...O and weak π–π inter­actions influence the conformation of the mol­ecules and the crystal packing. The azobenzene moiety of the mol­ecule has a trans configuration and the dihedral angle between the planes of the two aromatic rings is 10.13 (8)°.
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