Tetramethyloctadehydro-[26] and -[28]annulenediones have been synthesized; the corresponding dicationic species in D2SO4 showed paratropicity and diatropicity, respectively, affording the first confirmation of tropicity alternation in monocyclic annulenediones.
H. Higuchi, S. Kondo, Y. Watanabe, J. Ojima and G. Yamamoto, J. Chem. Soc., Chem. Commun., 1994, 877 DOI: 10.1039/C39940000877
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