Ethyl (E)-3-[1'-ethyl-2-oxo-4'-(phenyl-sulfon-yl)-2H-spiro-[acenaphthyl-ene-1,2'-pyrrolidine]-3'-yl]acrylate

Abstract

In the title compound, C(28)H(27)NO(5)S, the five-membered pyrrolidine ring, which exhibits an envelope conformation (the C atom at the spiral junction being the flap atom), makes dihedral angles of 57.37 (10) and 86.84 (8)°, respectively, with the phenyl ring and the acenaphthyl-ene ring system. In the crystal, mol-ecules associate via two C-H⋯O hydrogen bonds, forming R(2) (2)(20) and R(2) (2)(10) graph-set motifs.

Fig. 1.

Perspective view of the molecule showing the atom numbering scheme. Displacement ellipsoids are drawn at 30% probability level. H atoms are presented as a small spheres of arbitrary radius.

Fig. 2.

The crystal packing of the molecules viewed along the a–axis; H–bonds are shown as dashed lines forms R22(20) and R22(10) graph set motifs. For the sake of clarity, H atoms, not involved in hydrogen bonds, have been omitted.