6-Amino-5-(1-amino-2,2-dicyanovinyl)-3,3a,4,5-tetrahydro-2H-indene-4-spiro-1'-cyclopentane-3a,7-dicarbonitrile-thiophene-2-carbaldehyde (1/0.5)

Acta Crystallographica Section E

Structure Reports Online

Volume 66, Part 10 (October 2010)

organic compounds

xu5020 scheme

Acta Cryst. (2010). E66, o2484-o2485 [ doi:10.1107/S1600536810034434 ]

6-Amino-5-(1-amino-2,2-dicyanovinyl)-3,3a,4,5-tetrahydro-2H-indene-4-spiro-1'-cyclopentane-3a,7-dicarbonitrile-thiophene-2-carbaldehyde (1/0.5)

A. M. Asiri and S. W. Ng

Abstract: In each of the two independent indene-4-spiropentane molecules in the asymmetric unit of the title 2:1 adduct, C₁₉H₁₈N₆·0.5C₅H₄OS, the cyclohexene ring adopts a half-chair conformation and the cyclopentene and cyclopentane rings adopt envelope conformations. The mean plane through the cyclohexene/cyclopentene fused system is aligned at a dihedral angle of 77.9 (1)° with respect to the mean plane through the cyclopentane ring in one molecule and 87.0 (1)° in the other. In the crystal, adjacent indene-4-spiropentane molecules are linked by N-HN hydrogen bonds into a three-dimensional network. The spaces within the network are occupied by the thiophene-2-carbaldehyde molecules. The thiophene-2-carbaldehyde unit is disordered over two positions of equal occupancy. The crystal studied was found to be a non-morohedral twin with two minor twin components of 18.4 and 9.7%.