Novel isopropyl-substituted di- and tri-benzocyclo-octatetraenes are reduced to the corresponding dianions which, from their n.m.r. spectroscopic description, appear to be the first examples of conformationally mobile, ionic cyclo-octatetraene systems.
W. Heinz, P. Langensee and K. Müllen, J. Chem. Soc., Chem. Commun., 1986, 947 DOI: 10.1039/C39860000947
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