title: Crystal structure of 2'-[(2',4'-di-fluoro-biphenyl-4-yl)carbon-yl]-1'-phenyl-1',2',5',6',7',7a'-hexa-hydro-spiro-[indole-3,3'-pyrrolizin]-2(1H)-one.
abstract: In the title pyrrolizidine derivative, C33H26F2N2O2, both pyrrolidine rings of the pyrrolizidine moiety adopt an envelope conformation. The di-fluoro-phenyl group is oriented at an angle of 54.3 (1)° with respect to the oxindole moiety. The crystal packing features an N-H⋯O hydrogen bond, which forms an R 2 (2)(8) motif, and a C-H⋯O inter-action, which generates a C(8) chain along [010]. In addition, this chain structure is stabilized by C-H⋯π inter-actions. In one of the pyrrolidine rings, the methyl-ene group forming the flap of an envelope and the H atoms of the adjacent methyl-ene groups are disordered over two sets of sites, with site-occupancy factors of 0.571 (4) and 0.429 (4).
authors.affiliation: Department of Chemistry, Faculty of Science, Annamalai University, Annamalainagar 608 002, India.
authors.forename: M
authors.initials: M
authors.lastname: Fathimunnisa
authors.affiliation: Department of Chemistry, Faculty of Science, Annamalai University, Annamalainagar 608 002, India.
authors.forename: H
authors.initials: H
authors.lastname: Manikandan
authors.affiliation: Department of Physics, Kings College of Engineering, Punalkulam 613 303, India.
authors.forename: S
authors.initials: S
authors.lastname: Selvanayagam
authors.affiliation: Laboratory of X-ray Crystallography, Indian Institute of Chemical Technology, Hyderabad 500 067, India.
authors.forename: B
authors.initials: B
authors.lastname: Sridhar
keywords: C—H⋯π inter­actions; N—H⋯O hydrogen bonds; crystal structure; pyrrolizidine derivatives