Tricarbonylcyclohexadienyliron salts of type (2; R2=+), after reaction successively with a β-diketone or a β-keto-ester and manganese dioxide or lead dioxide, give tricarbonyl-cis-3a,7a-dihydrofuraniron complexes of type (3). Use of deuteriated intermediates indicated that the cyclisation occurs with specific loss of the 6-endo-proton.
A. J. Birch, K. B. Chamberlain and D. J. Thompson, J. Chem. Soc., Perkin Trans. 1, 1973, 1900 DOI: 10.1039/P19730001900
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