1′-Methyl-3′-(4-methylbenzoyl)-4′-[5-(2-thienyl)-2-thienyl]spiro[acenaphthylene-1,2′-pyrrolidin]-2(1H)-one

In the title compound, C32H25NO2S2, the mean plane through the five-membered pyrrolidine ring, which exhibits an envelope conformation, makes dihedral angles of 82.3 (1) and 83.9 (9)° with the benzene ring and the acenaphthylene ring system, respectively. The dihedral angle between the thiophene rings is 19.0(3)°. The crystal structure shows C—H⋯π and π–π interactions [centroid–centroid distance = 3.869 (2) Å].

In the title compound, C 32 H 25 NO 2 S 2 , the mean plane through the five-membered pyrrolidine ring, which exhibits an envelope conformation, makes dihedral angles of 82.3 (1) and 83.9 (9) with the benzene ring and the acenaphthylene ring system, respectively. The dihedral angle between the thiophene rings is 19.0(3) . The crystal structure shows C-HÁ Á Á andinteractions [centroid-centroid distance = 3.869 (2) Å ].
Cg8 is the centroid of the C18-C23 ring.
The molecular structure is influenced by C-H···O intramolecular interactions. In addition to van der Waals interaction, the crystal packing is stabilized by C-H···π (Table. 1) hydrogen bonds as well as by π-π electron interactions. The π-π electron interactions between the rings Cg7 -Cg8 at x, y, z with the centroid-centroid distance equal to 3.8655 (12) Å, is observed in the crystal structure [Cg7 and Cg8 are the centeroid of the rings C6-C11 and C18-C23].

Experimental
A solution of the (4-chloro-phenyl-3-Bithiophenyl-prop-2-ene-1-one derived from Bithiophene (1-mmol), Acenapthoquinone (1 mmol), sarcosine (1 mmol) in toluene (30 ml) was refluxed for 8 hrs. The progress of the reacion was evidenced by the TLC analysis. The solvent was removed under reduced pressure and the crude product was subjected to column chromatogarphy using petroleum ether/ethyl acetate (4:1) as solvent. X-ray diffraction were obtained by slow evaporation of a solution of the title compound in hexene at room temperature.

Refinement
The C and S atoms of one thiophene ring are disordered over two positions (C30/C30'and S2/S2') with refined occupancies of 0.553 (5) and 0.448 (5). The corresponding bond distances involving the disordered atoms were restrained to be equal.
All H atoms were fixed geometrically and allowed to ride on their parent C atoms, with C-H distances fixed in the range 0.93-0.97 Å with U iso (H) = 1.5U eq (C) for methyl H 1.2U eq (C) for other H atoms.   (2)