1′-Methyl-4′-[4-(trifluoromethyl)phenyl]dispiro[acenaphthylene- 1,2′-pyrrolidine-3′,2′′-indane]-2,1′′(1H) -dione

In the title compound, C₃₁H₂₂F₃NO ₂, the pyrrolidine and cyclo-pentane rings within the dihydro-indene ring system are in envelope conformations, with the N atom and the spiro-C atom at the flap, respectively. An intra-molecular C - H⋯O hydrogen bond forms an S(8) ring motif. The mean plane through the pyrrolidine ring [r.m.s. deviation = 0.179 (2) Å] makes dihedral angles of 86.30 (13), 88.99 (10) and 79.69 (11)°with the benzene ring, the dihydro-acenaphthyl-ene ring and the mean plane of the indane system, respectively. In the crystal, molecules are linked by C - H⋯O and C - H⋯N hydrogen bonds into a two-dimensional network parallel to the ac plane. C - H⋯π inter-actions further stabilize the crystal structure.