The intervention of a zwitterionic intermediate is proposed in the thermal isomerisations of the t-butyl-cyanoketen-methylated allene adducts (6) and (8), but not for adducts (1)–(4); evidence is given for the intervention of a similar intermediate in the cycloaddition of t-butylcyanoketen to 1-t-butyl-1-methylallene.
H. A. Bampfield and P. R. Brook, J. Chem. Soc., Chem. Commun., 1974, 172 DOI: 10.1039/C39740000172
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