AM1 calculations show that the boat and chair Cope rearrangements of hexa-1,5-diene can each proceed by two different paths, one involving an aromatic and the other a biradical-like transition state, distinguishable by their entropies of activation.
M. J. S. Dewar and C. Jie, J. Chem. Soc., Chem. Commun., 1987, 1451 DOI: 10.1039/C39870001451
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