5,6-Dimethoxy-4′,5′-diphenylindane-2-spiro-3′-pyrrolidine-2′-spiro-3"-indoline-1,2"-dione

In the title compound, C33H28N2O4, the central pyrrolidine ring adopts a half-chair conformation. Both the indolinone and indanone groups are twisted, with their five-membered rings adopting a half-chair and an envelope conformation, respectively. The two benzene rings and the mean plane of the indolinone and indanone groups make dihedral angles of 71.98 (10), 84.32 (10), 86.26 (9) and 78.50 (9)degrees, respectively, with the central pyrrolidine ring. Intramolecular C-H center dot center dot center dot O hydrogen bonds stabilize the molecular conformation. In the crystal, pairs of intermolecular N-H center dot center dot center dot O hydrogen bonds link the molecules into centrosymmetric dimers. The dimers are interconnected into ribbons propagating along [110] via weak intermolecular C-H center dot center dot center dot O hydrogen bonds. Weak intermolecular C-H center dot center dot center dot pi and pi-pi [centroid-centroid distance = 3.6509 (11) angstrom] interactions are also observed.