On the basis of the 13C NMR spectra of the 6,7-dimethylene-2,4-diphenylbicyclo[3.2.1]oct-3-en-2-yl anion 12, which has been prepared in four steps from 2,4-diphenylbicyclo[3.2.1]octa-2,6-diene 7, and the 2,4-diphenylbicyclo[3.2.1]octa-3,6-dien-2-yl anion 11, it seems reasonable to ascribe a bishomoaromatic character to 11.
M. Christl, R. Leß and H. Müller, J. Chem. Soc., Chem. Commun., 1994, 1353 DOI: 10.1039/C39940001353
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