Synthesis of polyamides containing cytosine and hypoxanthine

The di(cyanomethyl) methylsuccinate derivative of cytosine and di(p-nitrophenyl) methyl-succinate derivative of hypoxanthine were prepared and polycondensed with a variety of diamines to provide powdery polyamides with molecular weights in the range of 1000–3100. The polyamides are soluble in DMSO and formic acid, but insoluble in ordinary organic solvents.