Abstract
The x-ray crystal structures forcis,cis- andtrans,trans- 2,3-dimethyl-1-nitrocyclopropanecarboxylic acid, 2,2,3,3-tetramethyl-1-nitrocyclopro-panecarbonitrile, 2,2,3,3-tetramethyl-1-nitrocyclo-propanecarboxamide, andtrans,trans,trans,trans-2,2′,3,3′-tetramethyl-1,1′-dinitrobicyclopropyl are reported. Contrary to expectations, π-accepting groups that are syn to dimethyl substituents prefer a conformation perpendicular to the three-membered ring when there is an sp2 electron-withdrawing substituent also bonded to the same carbon atom. Ab initio calculations are reported for model compounds and these results are compared with the experimentally determined ones.
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O'Bannon, P.E., Carroll, P.J. & Dailey, W.P. X-ray structural studies of several novel nitrocyclopropanes. Struct Chem 1, 491–499 (1990). https://doi.org/10.1007/BF00671236
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DOI: https://doi.org/10.1007/BF00671236