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The regioselective C-electrophilic addition of isocyanates 4 to ethyl 1H-perimidine-2-acetate 3a and 1H-perimidine-2-acetonitrile 3b has been investigated and leads to new heterocyclic ketene aminals 5'a-j yields ranging from 60-94%. 1 H and 13 C NMR spectra of these compounds are discussed and assigned. The chemical structure of these compounds incorporates an exocyclic double...