2-Amino-4-(4-chloro­phen­yl)-5,6,7,8,9,10-hexa­hydro­benzo[8]annulene-1,3-dicarbonitrile

In the title compound, C₂₀H₁₈ClN₃, the cyclo­octene ring exhibits conformational disorder of two methyl­ene groups with a site-occupation factor of 0.859 (6) for the major occupied site. In the crystal, mol­ecules are connected into inversion dimers via pairs of weak N—H...N hydrogen bonds, forming an R₂²(12) graph-set motif. These dimers are further connected via weak N—H...Cl inter­actions into chains running along [011]. There are also C—H...N interactions present in the crystal.

1′-Benzylspiro­[chromene-2,4′-piperi­dine]-4-carbonitrile

In the title compound, C₂₁H₂₀N₂O, the piperidine ring adopts a chair conformation while the pyran ring adopts a screw-boat conformation. The piperidine ring forms dihedral angles of 65.75 (3) and 67.79 (5)° with the chroman and methyl-substituted benzene rings, respectively. The crystal structure features weak C—H...π and π–π [centroid–centroid distance = 3.8098 (8) Å] inter­actions.

1-Methyl-1′-(4-methyl­phen­yl)-2′,3′,5′,6′,7′,7a'-hexa­hydro-1′H-dispiro­[piperidine-3,2′-pyrrolizine-3′,3′′-indoline]-4,2′′-dione

The title compound, C₂₆H₂₉N₃O₂, crystallizes with two mol­ecules in the asymmetric unit, having C—H...O inter­actions between them and resulting in a dimer characterized by an R₂²(11) motif. These dimers are linked into an ABABAB chain via N—H...O, N—H...N and C—H...O built edge-fused R₁²(5) and R₂²(7) motifs. This chain is linked to its inversion-related partner via N—H...O bonds with an R²₂(8) motif and leads to a double chain extending along the b axis characterized by an R₆⁶(36) motif across the inversion centres. The methyl group of the phenyl ring and the oxindole of mol­ecule A and B are involved in C—H...π inter­actions. One C atom of the pyrrolizine ring of mol­ecule A and its attached H atoms show positional disorder, the major and minor components being in the ratio 0.706 (7):0.294 (7).