The title annulenes have been synthesized and their 1H n.m.r. spectra indicate that the [28]- and [34]-annulenes as well as the lower-membered ones can sustain a ring current.
J. Ojima, S. Fujita, M. Masumoto, E. Ejiri, T. Kato, S. Kuroda, Y. Nozawa and H. Tatemitsu, J. Chem. Soc., Chem. Commun., 1987, 534 DOI: 10.1039/C39870000534
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