title: 1',1''-Dimethyl-4'-(4-methyl-phen-yl)di-spiro-[11H-indeno-[1,2-b]quinoxaline-11,2'-pyrrolidine-3',3''-piperidin]-4''-one.
abstract: In the title compound, C31H30N4O, the central pyrrolidine ring adopts an envelope conformation with the methyl-ene C atom being the flap. The quinoxaline and indane rings are each planar, having r.m.s. deviations of 0.030 and 0.050 Å, respectively. The pyrrolidine ring mean plane forms dihedral angles of 88.25 (1) and 83.76 (1)° with the quinoxaline and indane rings, respectively. Intra-molecular C-H⋯O and C-H⋯N inter-actions are observed. In the crystal, C-H⋯π inter-actions lead to helical supra-molecular chains along the b-axis direction.
authors.affiliation: Department of Physics, The Madura College, Madurai 625 011, India.
authors.forename: R A
authors.initials: RA
authors.lastname: Nagalakshmi
authors.affiliation: Department of Physics, The Madura College, Madurai 625 011, India.
authors.forename: J
authors.initials: J
authors.lastname: Suresh
authors.affiliation: Department of Organic Chemistry, School of Chemistry, Madurai Kamaraj University, Madurai 625 021, India.
authors.forename: K
authors.initials: K
authors.lastname: Malathi
authors.affiliation: Department of Organic Chemistry, School of Chemistry, Madurai Kamaraj University, Madurai 625 021, India.
authors.forename: R Ranjith
authors.initials: RR
authors.lastname: Kumar
authors.affiliation: Department of Food Science and Technology, University of Ruhuna, Mapalana, Kamburupitiya 81100, Sri Lanka.
authors.forename: P L N
authors.initials: PL
authors.lastname: Lakshman