Norbornadiene and 1,2-bismethoxycarbonylcyclobutadiene furnish a novel heptacyclic system 3(whose X-ray crystal structure has been determined)and an annulated pterodactylane derivative 4 in a single step.
G. Mehta, M. B. Viswanath, M. Nethaji and K. Venkatesan, J. Chem. Soc., Chem. Commun., 1992, 82 DOI: 10.1039/C39920000082
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