Treatment of the naphthoquinol (3) with zinc chloride and acetic anhydride results in the unexpected formation of the novel tricyclic and tetracyclic exo-methylene ketones (5) and (6); irradiation of (5) leads to a third unique polycyclic ketone (7).
Z. Q. Jiang, J. R. Scheffer, A. S. Secco, J. Trotter and Y. Wong, J. Chem. Soc., Chem. Commun., 1983, 773 DOI: 10.1039/C39830000773
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