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The heterocyclic ketene aminals 4 with a β-hydroxyethyl group on the nitrogen atom are synthesized by the reaction of the corresponding ketene mercaptals 3 with 2-(2-aminoethylamino)ethanol. In the case of 3 with one aroyl substituent, besides the ketene aminals 4, the benzoate of ketene aminals 5 are also isolated.
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