Although the reaction of mono-substituted urea 2 moles with diamine 1 mole seems to produce a N
1N
4-di-substituted compound, There happens alsoa substitution reaction in the substituted side of mono-substituted urea and gives a polymer. That is the formation of the polymer or N
1N
4-di-substituted compound depends on easiness or difficulty of exchange reaction between the substituted group of urea and the primary amine. Accordingly, N
1N
4-di-substituted compound is only formed from the reaction of aromatic diamine and alkylurea, considering its velocity of reaction. All other cases give polymers and not N
1N
4-di-substituted compounds
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