The syn-cyclopropylidene dimer 5, obtained by reaction of compound 4 with methyllithium, is readily elaborated to the bis-p-benzoquinone 7 which undergoes intramolecular [π2s+π2s] cycloaddition to give the tube-like molecule 8.
M. G. Banwell, D. C. R. Hockless and J. M. Walter, Chem. Commun., 1996, 1469 DOI: 10.1039/CC9960001469
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