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The seven-membered ring in the title compound, C18H16N2O, adopts a boat conformation with the two phenyl­ene carbons representing the stern and the methyl­ene C atom the prow. The dihedral angle between the best plane through the seven-membered ring and the phenyl ring is 62.13 (3)°.

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In the title compound, C18H26N4OS, the imine C=N bond has a Z configuration, whereas the N—N—C=S unit has an E conformation. In the crystal, mol­ecules are connected through N—H...O hydrogen bonds, forming zigzag chains running along the b axis. The nonyl chain adopts an extended zigzag conformation.

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In the title 1-alkyl­isatin 3-thio­semicarbazone, C19H28N4OS, the imine C=N bond has a Z configuration, whereas the N—N—C=S unit has an E conformation. In the crystal, mol­ecules are connected by N—H...O hydrogen bonds, forming zigzag chains running along the b axis.

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The seven-membered fused-ring in the title compound, C10H10N2O·H2O, adopts a boat conformation (with the two phenyl­ene C atoms representing the stern and the methyl­ene C atom the prow). In the crystal, two benzodiazepinone mol­ecules are linked about a center of inversion by diazepine–carbonyl N—H...O hydrogen bonds. The dimers are further linked by water–diazepine O—H...N hydrogen bonds, forming a linear chain.

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In the title N-substituted benzimidazol-2-one, C10H10N2O, the fused ring system is almost planar (r.m.s. deviation = 0.01 Å) and aligned at 57.9 (1)° with respect to the propenyl fragment. In the crystal, adjacent mol­ecules are linked by pairs of N—H...O hydrogen bonds into inversion dimers.

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In the title N-alkyl isatin, C22H33NO2, the isatin moiety is planar (r.m.s. deviation = 0.03 Å). The tetra­decyl substituent has all torsion angles in an anti­periplanar conformation.

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In the title N-alkyl isatin, C18H25NO2, the isatin moiety is almost planar (r.m.s. deviation = 0.03 Å). C-C-C-C torsion angles of the decyl substituent indicate an all-antiperiplanar conformation.
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