Addition of dibromomaleic anhydride to tetrachlorocyclopentadienone dimethyl acetal gives the pseudo-lactone 11(X-ray crystal structure analysis) and not the mixture of endo- and exo-adducts 2 previously claimed; reduction of this product with Zn/HOAc gives 13 and 14 rather than the putative isolable norbornadienone acetyl 3.
D. W. Jones, D. E. Sunko and M. Thornton-Pett, J. Chem. Soc., Perkin Trans. 1, 1994, 721 DOI: 10.1039/P19940000721
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