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Regioselective reactions of N-(carboxyalkyl)ureas (ureido acids) and N-(aminoethyl)ureas with 1,2-dioxo-1,2-diphenylethane (benzyl) and glyoxal are studied in detail. The structure of the reactants affects the reaction regioselectivity. Acid-catalyzed reactions of glyoxal with 1-[2-(dimethylamino(acetylamino))ethyl]ureas and benzene with ureido acids result mainly in 2,6-di-substituted glycolurils...
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