t-Butylcyanoketen with bicyclo[2,2,1]heptadiene gives a tetracyclic adduct (2) by a formal [2 + 2 + 2] cycloaddition involving the keten carbonyl group; with isobutene the keten gives an “ene”-product (7).
P. R. Brook and K. Hunt, J. Chem. Soc., Chem. Commun., 1974, 989 DOI: 10.1039/C39740000989
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