Synthesis of Polyamides-11 with Sulfonamide End Groups

α,ω-Diaminooligoamides-11 were prepared and their structure was controlled by endgroup titration, elemental analysis, and infrared and ¹H NMR spectroscopy. A fundamental study of the reaction between αA,ω diaminooligoamides and p-toluenesulfonyl chloride in DMF showed that a side reaction takes place. This was carefully characterized. When the reaction was carried out in chlorobenzene (on models and on polymers), well-defined compounds were obtained which were characterized by different techniques.