A method of obtaining macrocyclic compounds by stepwise condensation of aromatic and heterocyclic nitriles with amines is described. The technique was extended to give polymers containing repeating macrocyclic units, and to show the optimum reaction conditions. The properties of these polymers and possible applications are discussed. Related polymer systems such as the polybenzobis(aminoiminopyrrolenines), the polybenzimidazoles and the polybenziminobenzimidazoles were also obtained by an adaptation of the method.
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D. I. Packham (1970) studied this question.
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