Reactions of Amines with Urea and its Derivatives. III:Reactions of Urea with Diamines.

概要

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Diamines having no substituent group on the nitrogen are primary amines andthose having substituent group are secondary amines. Accordingly, the reaction of diamine and urea can easily be assumed from the reactions of primary amine and urea, and secondary amine and urea. In the reaction of aliphatic diamine and urea, a monosubstituent of urea was obtained almost selectively. Since the disubstituent is very difficult for its formation, a monourea and diurea derivatives of diamine are formed at first, followed by the reaction for formation of disubstituents or polymerization reaction. Also, some of aliphatic diamines form a cyclic compound from the reaction with urea. In this case, the cyclic compound is f romed through the process of formation of high polymer and its depolymerization. In the reaction of aromatic diamine and urea, there are the reactions of formation of a monosubstituent of urea at first, followed by the formation of its disubstituent; in this case, polymerization reaction happens at the same time of formation of monosubstituent of urea. The reaction of secondary diamine and urea gives no polymerization productas it is clear from its reaction mechanism.
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