Newly-found steric limits for the Knorr–Paal reaction in the case of 2-methyl-1,2-propanediamine and acetonylacetone make it possible for the process to occur with only one amino group, giving aminopyrrole 2, and with aziridines, due to dimerization under the conditions of the reaction, giving 1-((β-aziridinoalkyl)pyrroles 4a,b.
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Kostyanovsky et al. (1993) studied this question.
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