The NMR spectra of the cyclohexadienyl anion 5 and of the cyclo‐octadienyl anion 7 have been studied. The strongly bent anion 7 shows at low temperatures reversible line broadening. At higher temperatures 7 electrocyclizes to the bicyclo[3.3.0]octenyl anion. It is concluded that in neither of these anions there is substantial 1,5 overlap (homoaromaticity).
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Kloosterziel et al. (1970) studied this question.
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