The addition of dichloro- and dibromo-carbenes to the more substituted double bond of five different allenes gave 1,1-dichloro- and 1,1-dibromo-2-methylenecyclopropanes. Some of these have been converted by means of n-butyl lithium to cumulenes.
W. J. Ball, S. R. Landor and N. Punja, J. Chem. Soc. C, 1967, 194 DOI: 10.1039/J39670000194
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