In the title compound, C24H25N3O4, the pyrrolidine ring adopts an envelope conformation while the pyrrolidine-2′′,5′′-dione ring adopts a twist conformation. The indoline unit is planar [maximum deviation of −0.050 (9) Å] and forms a dihedral angle of 40.36 (4)° with the methoxy­phenyl ring. Intra­molecular C—H⋯O hydrogen bonds are observed. In the crystal, mol­ecules are linked into a two-dimensional network parallel to the ab plane by inter­molecular C—H⋯O hydrogen bonds and C—H⋯π inter­actions.

In the title compound, [Fe(C5H5)(C21H20NO5)], the pyrrolidine and cyclo­penta­none rings exhibit a twist conformation. The pyrrolidine ring is almost perpendicular to the cyclo­penta­none ring, making a dihedral angle of 81.91 (6)°. The mol­ecular conformation is stabilized by an intra­molecular O—H⋯N hydrogen bond and C—H⋯O inter­actions. The crystal structure is stabilized by inter­molecular C—H⋯O inter­actions.

In the title compound, C36H31ClN2O4Se, the four-membered β-lactam ring is fused to a pyrrolidine ring. The central five-membered ring of the fused tricyclic system exhibits an envelope conformation with the N atom as the flap, while the other five-membered ring exhibits a twist conformation. The chloro­phenyl ring is almost perpendicular to the pyrrolidine ring, making a dihedral angle of 73.45 (1)°. The crystal structure is stabilized by weak inter­molecular C—H⋯O inter­actions and the packing is further enhanced by C—H ⋯N inter­actions and π–π inter­actions between benzene rings of tetra­lone groups in mol­ecules related by an inversion center, with a centroid–centroid separation of 3.8923 (2) Å.

Key indicators: single-crystal X-ray study; T = 293 K; mean (C-C) = 0.003 Å; disorder in main residue; R factor = 0.049; wR factor = 0.169; data-to-parameter ratio = 18.8.In the title compound, C 29 H 24 F 2 N 2 O 2 , one of the pyrrolidine rings of the pyrrolizine system is disordered over two sites, with occupancy factors 0.734:0.266 (12). Both components of the disordered pyrrolidine ring adopt envelope conformations, whereas the other pyrrolidine ring adopts a twist conformation. The molecules are linked into centrosymmetric dimers by N-HÁ Á ÁO hydrogen bonds and the dimers are connected via C-HÁ Á Á interactions. The crystal structure is also stabilized by intermolecular C-HÁ Á ÁF hydrogen bonds. Related literature

In the mol­ecule of the title compound, C38H37N3O7, the pyrrolidine ring adopts a twist conformation and the six-membered heterocyclic ring has a boat conformation. In the crystal structure, mol­ecules are linked into a three-dimensional framework through inter­molecular C—H⋯O hydrogen bonds. One ethyl group is disordered over two positions with occupancies 0.67 (2)/0.33 (2).