The crystal structures of 2,2′-biimidazole-1,1′-diacetone, C12H14N4O2, and 2,2′-biimidazole-1,1′-diacetonitrile, C10H8N6, have been determined. Both molecules crystallize with coplanar rings having substituents in a trans disposition with a center of inversion located midway between the bridging C atoms.
P. M. Secondo et al., "1,1′-Diketone and 1,1′-dinitrile Derivatives of 2,2′-biimidazole," Acta Crystallographica Section C: Crystal Structure Communications, Wiley-Blackwell, Jan 1996.
The definitive version is available at https://doi.org/10.1107/S0108270196005823
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