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New poly[(amino)amide]s (4) deriving from 1,2,4,5-benzenetetraamine and terephthalic, isophthalic, or 2,5-furandicarboxylic acid (2ac) were indirectly prepared by detosylation of the corresponding new poly[(tosylamino)amide]s 3, which were obtained by low-temperature solution polymerization of 4,6-ditosylamino-l,3-phenylenediamine (1) with the dicarboxylic acid dichlorides 2a-c. In a subsequent step the poly[(amino)amide]s were converted by polydehydrocyclocondensation into the heat-resistant aromatic poly(imidazo[4,5-flbenzimidazole)s (5) by heating in a high vacuum. The results of elemental analysis, IR and UV spectroscopy, inherent viscosity measurements, molecular weight determination (osmometry), and thermal analysis (DSC, TG) of the prepared polymers are compared and discussed.

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