4′-(4-Bromophenyl)-1′-methyldispiro-[acenaphthylene-1, 2′-pyrrolidine-3′,2′′-indane]-2,1′′(1H) -dione

In the title compound, C₃₀H₂₂BrNO₂, the cyclo-pentane ring of the dihydro-acenaphthyl-ene group and the pyrrolidine ring are both in envelope conformations with the spiro C atom and N atom, respectively, as the flap atom. The cyclo-pentane ring of the indane group adopts a half-chair conformation. A weak intra-molecular C - H⋯O hydrogen bond forms an S(8) ring motif. The naphthalene ring system of the dihydro-acenaphthyl-ene group forms dihedral angles of 41.76 (6) and 42.17 (6)°with the benzene ring of the bromo-phenyl group and the benzene ring of the indane group, respectively. The dihedral angle between the two benzene rings is 83.92 (7)°. In the crystal, molecules are linked by weak C - H⋯O and C - H⋯N hydrogen bonds into a two-dimensional network parallel to the ac plane. Weak C - H⋯π inter-actions are also observed.