title: 1'-Methylcyclooctane-1-spiro-3'-pyrrolidine-2'-spiro-3''-indoline-2,2''-dione and 1,1'-dimethylpiperidine-3-spiro-3'-pyrrolidine-2'-spiro-3''-indoline-2'',4-dione.
abstract: In both title compounds, C(19)H(24)N(2)O(2), (I), and C(17)H(21)N(3)O(2), (II), respectively, there are two molecules in the asymmetric unit and the pyrrolidine rings adopt envelope conformations. The conformations of the cyclooctane [in (I)] and 1-methylpiperidone [in (II)] rings are boat-chair and chair, respectively. The indolin-2-one group is almost perpendicular to the pyrrolidine ring. Intermolecular C-H...O, N-H...O and N-H...N interactions provide stability to the structures.
authors.affiliation: Department of Physics, Madura College, Madurai 625 011, India.
authors.forename: J
authors.initials: J
authors.lastname: Suresh
authors.forename: R
authors.initials: R
authors.lastname: Suresh Kumar
authors.forename: S
authors.initials: S
authors.lastname: Perumal
authors.forename: S
authors.initials: S
authors.lastname: Natarajan
mesh_terms: D018360:Crystallography, X-Ray; D004355:Drug Stability; D006860:Hydrogen Bonding; D007211:Indoles / Q000737:chemistry*; D008958:Models, Molecular; D008968:Molecular Conformation; D010880:Piperidines / Q000737:chemistry*; D011759:Pyrrolidines / Q000737:chemistry*; D013141:Spiro Compounds / Q000737:chemistry*
chemical_list: C524199:1'-methylcyclooctane-1-spiro-3'-pyrrolidine-2'-spiro-3''-indoline-2,2''-dione; D007211:Indoles; D010880:Piperidines; D011759:Pyrrolidines; D013141:Spiro Compounds; C057812:indoline