Addition of bis(trifluoromethyl)keten to 1,3,3-trimethylcyclopropene gives five rearranged adducts explained by a stepwise mechanism involving the dipolarions (9), (10), and (11).
D. H. Aue and G. S. Helwig, J. Chem. Soc., Chem. Commun., 1974, 925 DOI: 10.1039/C39740000925
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