Addition of t-butylcyanoketen to 3,3-dimethylcyclopropene and 1,3,3-trimethylcyclopropene gives mixtures of the bicyclo[2,1,0]pentan-2-ones (3a,b) and rearranged products (4a,b) and (5b); the ketone (3b) rearranges to (6b) but not to (4b).
D. H. Aue, D. F. Shellhamer and G. S. Helwig, J. Chem. Soc., Chem. Commun., 1975, 603 DOI: 10.1039/C39750000603
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