Carbene complexes of tungsten, bearing a co-ordinated double bond two carbons away from the carbene function, react with alkynes to give, after insertion of the alkyne, bicyclo[4.1.0]heptane derivatives as a result of cyclopropanation of the double bond by the newly formed carbene complex.
A. Parlier, H. Rudler, N. Platzer, M. Fontanille and A. Soum, J. Chem. Soc., Dalton Trans., 1987, 1041 DOI: 10.1039/DT9870001041
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