Cyclobutylidene, or a related carbenoid, can be generated by reaction of geminal dibromocyclobutane with methyl-lithium at temperatures as low as –78 °C to yield methylanecyclopropane and cyclobutene nearly quantitatively.
U. H. Brinker and G. Schenker, J. Chem. Soc., Chem. Commun., 1982, 679 DOI: 10.1039/C39820000679
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