addenda and errata
organic compounds
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—HO and O—HO and intermolecular O—HO hydrogen bonds into a three-dimensional network.
organic compounds
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—HO hydrogen bonds which, together with intramolecular N—HO bonds, form an S(6)S(6)[R22(13)]S(6)S(6) motif.
organic compounds
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—HO hydrogen bonds which, together with an intramolecular N—HO bond, form an S(6)C(13) motif. The structure is further stabilized by C—Hπ and π–π interactions.
organic compounds
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—HO hydrogen bonding, are linked by intermolecular O—HO hydrogen bonds, forming a three-dimensional network.
organic compounds
The title compound, C14H12N2O4, exists as an enol–imine tautomer, in which a strong intramolecular O—HN hydrogen bond is formed. This study verifies the preference of the enol–imine tautomeric form in the solid state.
organic compounds
The title compound, C15H14N2O4, exists as an enol–imine tautomer, in which a strong intramolecular O—HN hydrogen bond is formed. This work verifies the preference for the enol–imine tautomeric form in the solid state.
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, 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—Hπ interactions.
organic compounds
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—Hπ interactions.
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, C14H13N1O3, adopts the keto–amine tautomeric form, with an intramolecular N—HO resonance-assisted hydrogen bond. The two benzene rings are nearly coplanar [dihedral angle = 14.3 (2)°]. The molecules are linked by intermolecular O—HO hydrogen bonds and C—H π interactions between methyl groups and benzene rings.
organic compounds
The molecule of the title compound, C17H13NO2, is nearly planar and exists in the keto–amine (N—HO) 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—HO hydrogen bonds to form dimers, and are further linked by C—Hπ interactions, forming a three-dimensional network.
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 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—HO hydrogen bonds, forming a two-dimensional network.
organic compounds
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—HO hydrogen bonds, forming a two-dimensional network.
organic compounds
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—Hπ interactions.
organic compounds
The title compound, C14H11FN2O3, displays the characteristic features of azobenzene derivatives. Intramolecular O—HO 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)°.