Reaction of 1,1-dibromo-2-methylpropene with butyl-lithium at –100 °C, followed by treatment with a copper(I) complex produces the ate-type complex of the corresponding copper carbenoid, which cyclizes upon warming to afford decamethyl[5]radialene together with octamethyl[4]radialene; the structure of decamethyl[5]radialene has been established by X-ray analysis.
M. Lyoda, H. Otani, M. Oda, Y. Kai, Y. Baba and N. Kasai, J. Chem. Soc., Chem. Commun., 1986, 1794 DOI: 10.1039/C39860001794
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