Several δ,ε-unsaturated β,β-difluoro-α-diazo esters, prepared from the corresponding α-keto esters, undergo rhodium-catalysed intramolecular cyclopropanation reaction leading to the unprecedented formation of bicyclo[2.1.0]pentane ring systems.
G. Shi and W. Cai, J. Chem. Soc., Perkin Trans. 1, 1996, 2337 DOI: 10.1039/P19960002337
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