Lithium carbenoids prepared from 7,7-dibromonorcarane or (2,3-benzocyclohex-2-en-1-ylidene)dichloromethane with butyl-lithium at –85 °C were unreactive at this temperature in tetrahydrofuran (THF) but reacted rapidly with the addition of a stoicheiometric amount of ButOK to give the insertion product with THF, or the addition product with cyclohexane in high yields.
A. Oku, T. Harada, Y. Homoto and M. Iwamoto, J. Chem. Soc., Chem. Commun., 1988, 1490 DOI: 10.1039/C39880001490
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