A novel zinc-induced intramolecular cyclization of bis-(bromoacetyl) derivatives, leading to iso-heterocyclic quinones (IVa–c)via the primarily formed bicyclic diketones (IIIa–c), is described.
E. Ghera, Y. Gaoni and D. H. Perry, J. Chem. Soc., Chem. Commun., 1974, 1034 DOI: 10.1039/C39740001034
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