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Perturbation of degeneracy of the cope rearrangement by the crystal lattice of the beta-form of 1,5-dimethylsemibullvalene-2,6-dicarbonitrile studied by variable-temperature solid-state carbon-13 spectroscopy and X-ray crystallography at cryogenic temperatures Benesi A, Bertermann R, Forster H, Heubes M, Jackman LM, Koritsanszky T, Luger P, Mayer A, Quast H, Seefelder M, Zobel D Journal of the American Chemical Society, 122(18), 4455, 2000 |