Treatment of 1,1-dichloro-2,2-dimethylcyclopropane with butoxide ion in hexamethylphosphoramide generates dimethylallene-carbene formed via an unsymmetrical intermediate and not via dimethylcyclopropyne, together with 3-methylbutenyne.
L. Crombie, P. J. Griffiths and B. J. Walker, J. Chem. Soc. D, 1969, 1206 DOI: 10.1039/C29690001206
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