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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. [ABSTRACT FROM AUTHOR]

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. [ABSTRACT FROM AUTHOR]

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. [ABSTRACT FROM AUTHOR]

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. [ABSTRACT FROM AUTHOR]

The title compound, C14H15ClN2O4, adopts a keto–hydrazo tautomeric form stabilized by an intramolecular N—H...O hydrogen bond. The configuration around the N—N bond is trans. The dihedral angle between the aromatic ring and the plane of the aliphatic chain attached to the hydrazone group is 10.5 (1)°. In the solid state, molecules exist as centrosymmetrically related C—H...O hydrogen-bonded R22(24) dimers. [ABSTRACT FROM AUTHOR]

There are two crystallographically independent mol­ecules in the asymmetric unit of the title compound, C12H12ClBrN2O3. The mol­ecules adopt a keto–hydrazo tautomeric form, stabilized by an intra­molecular hydrogen bond. The aromatic ring and aliphatic chain have a trans configuration about the N—N bond. The mol­ecules pack via weak inter­molecular C—H⋯O hydrogen bonds which, together with an intra­molecular N—H⋯O bond, form an S(6)[ R22(14)] S(6) motif. [ABSTRACT FROM AUTHOR]

The title compound, C14H17ClN2O3, adopts a keto–hydrazo tautomeric form stabilized by an intra­molecular N—H⋯O hydrogen bond. The mol­ecule is roughly planar. [ABSTRACT FROM AUTHOR]

The title compound, C13H15ClN2O3, adopts a keto–hydrazo tautomeric form stabilized by an intra­molecular N—H⋯O hydrogen bond. The configuration around the N—N bond is trans. The dihedral angle between the aromatic ring and the plane of the C—C—C(=O)—C aliphatic chain is 6.07 (8)°. [ABSTRACT FROM AUTHOR]

The title compound, C10H13NO, crystallizes with two independent but essentially identical mol­ecules in the asymmetric unit. The mol­ecules are linked by two N—H⋯O and two C—H⋯O hydrogen bonds into chains of edge-fused rings in which R33(10) and R88(33) rings alternate. [ABSTRACT FROM AUTHOR]

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)°. [ABSTRACT FROM AUTHOR]

The title compound, C13H15ClN2O3, adopts a keto–hydrazo tautomeric form stabilized by an intra­molecular N—H⋯O hydrogen bond. The configuration around the N—N bond is trans. The dihedral angle between the aromatic ring and the plane of the aliphatic chain is 3.18 (4)°. [ABSTRACT FROM AUTHOR]