Synthesis and Crystal Structure of 1,1′-di(ethylpropionato)-2,2′-biimidazole, a Macromolecular Precursor
1,1,′-Di(ethylpropionato)-2,2′-biimidazole, C16H22N4O4, crystallizes from ice-cold ethanol in the space group P1sup>–, with a = 4.6742(9), b = 9.1119(13), c = 10.175(2) Å, α = 96.22(1), β = 96.29(2), γ = 97.53(1)°, and Z = 1. The molecule crystallizes with coplanar rings and the substituents assume a trans conformation with a center of inversion between the bridging carbon atoms.
W. M. Barnett et al., "Synthesis and Crystal Structure of 1,1′-di(ethylpropionato)-2,2′-biimidazole, a Macromolecular Precursor," Journal of Chemical Crystallography, Springer Verlag, Jan 1999.
The definitive version is available at http://dx.doi.org/10.1023/A:1009535501461
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