Crystal structure, Hirshfeld surface analysis and DFT calculations of ()-3-[1-(2-hy-droxy-phenyl-anilino)ethyl-idene]-6-methyl-pyran-2,4-dione.

The asymmetric unit of the title compound, CHNO, contains three independent mol-ecules, which differ slightly in conformation. Each contains an intra-molecular N-H⋯O hydrogen bond. In the crystal, O-H⋯O hydrogen bonds form chains of mol-ecules, which are linked into corrugated sheets parallel to (03) plane by C-H⋯O hydrogen bonds together with π inter-actions between the carbonyl groups and the 2-hy-droxy-phenyl rings.

1,1'-Dibenzyl-5,5''-dichloro-1,1'',2,2''-tetra-hydro-dispiro-[indole-3,7'-[6,9]diaza-tricyclo-[7.3.0.0(2,6)]dodecane-8',3''-indole]-2,2''-dione.

In the title compound, C(38)H(34)Cl(2)N(4)O(2), the piperazine ring adopts a chair conformation. The pyrrolidine rings that are fused to the piperazine ring adopt envelope conformations (in which the C atoms connecting the two rings represent the flap). The indoline ring systems are approximately planar (r.

5,5''-Dibromo-1,1''-bis-(prop-2-en-1-yl)-1,1'',2,2''-tetra-hydro-dispiro-[indole-3,7'-[6,9]diaza-tricyclo-[7.3.0.0(2,6)]dodecane-8',3''-indole]-2,2''-dione.

In the mol-ecule of the title compound, C(30)H(30)Br(2)N(4)O(2), the piperazine ring adopts a chair conformation. The pyrrolidine rings that are fused to the piperazine ring adopt envelope conformations (in which the N atom represents the flap). The indoline fused-ring systems are nearly planar (r.

1,1''-Bis(prop-2-en-1-yl)-1,1'',2,2''-tetra-hydro-dispiro-[indole-3,7'-[6,9]diaza-tricyclo-[7.3.0.0(2,6)]dodecane-8',3''-indole]-2,2''-dione.

The mol-ecule of the title compound, C(30)H(32)N(4)O(2), lies on a twofold rotation axis that passes through the mid-points of the C-C bonds of the piperazine ring, which adopts a chair conformation. The pyrrolidine ring that is fused to the piperazine ring adopts an envelope conformation (in which the N atom represents the flap). The indoline fused-ring system is nearly planar (r.

3-Hy-droxy-4-phenyl-1-(prop-2-en-1-yl)-2,3,4,5-tetra-hydro-1H-1,5-benzodiazepin-2-one.

The asymmetric unit of the title compound, C(18)H(18)N(2)O(2), contains three independent mol-ecules. In each, the seven-membered diazepine ring adopts a boat conformation with the hy-droxy-substituted C atom at the prow and fused-ring C atoms at the stern. In the crystal, the mol-ecules are linked by O-H⋯O and N-H⋯O hydrogen bonds.

1-Decyl-indoline-2,3-dione.

In the title N-alkyl isatin, C(18)H(25)NO(2), the isatin moiety is almost planar (r.m.s.

1-Tetra-decyl-indoline-2,3-dione.

In the title N-alkyl isatin, C(22)H(33)NO(2), the isatin moiety is planar (r.m.s.

1-(1-Decyl-2-oxoindolin-3-yl-idene)thio-semicarbazide.

In the title 1-alkyl-isatin 3-thio-semicarbazone, C(19)H(28)N(4)OS, the imine C=N bond has a Z configuration, whereas the N-N-C=S unit has an E conformation. In the crystal, mol-ecules are connected by N-H⋯O hydrogen bonds, forming zigzag chains running along the b axis.

1-(1-Nonyl-2-oxoindolin-3-yl-idene)thio-semicarbazide.

In the title compound, C(18)H(26)N(4)OS, the imine C=N bond has a Z configuration, whereas the N-N-C=S unit has an E conformation. In the crystal, mol-ecules are connected through N-H⋯O hydrogen bonds, forming zigzag chains running along the b axis. The nonyl chain adopts an extended zigzag conformation.