3-and 4-Halogenocycloheptatrienones can be prepared from the Δ2- and Δ3-norcarenes (1), (2), and (3) by an allylic oxidation-dehydrohalogenation sequence; evidence for the intermediacy of the bicyclic enones (4)–(7) in the formation of the troponoid skeleton is presented.
M. G. Banwell, J. Chem. Soc., Chem. Commun., 1982, 847 DOI: 10.1039/C39820000847
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