Dipotassium tribenzodihydroacepentalenediide 42– reacts with electrophiles to give 4,7-disubstituted tribenzodihydroacepentalene derivatives 3 with a highly pyramidalised double bond, as evidenced by X-ray structural determinations; protonation of the dianion 42– yields an interesting polycyclic [2 + 2] dimer 5.
R. Haag, B. Ohlhorst, M. Noltemeyer, A. Schuster, D. Kuck and A. de Meijere, J. Chem. Soc., Chem. Commun., 1993, 1727 DOI: 10.1039/C39930001727
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