NEW POLYMERS ON THE BASIS OF QUINOXALINE- CONTAINING MONOMERS

New monomers containing quinoxaline-2,3-diyl groups, viz., 2,3-bis(3-a mino-4-chlorophenyl)quinoxaline and 2,3-bis-(3-nitro-4-aminophenyl)qui noxaline, were synthesized by reducing or aminating 2,3-bis(3-nitro-4- chlorophenyl)quinoxaline. Polyimides, which have not been described in earlier papers, were obtained by the interaction of the first monomer with dianhydrides of pyromellitic and benzophenone-3,3',4,4'-tetracar boxylic acids. The interaction of the second monomer with dichloroanhy drides of iso- and terephthalic acids in conditions of reducing polyhe terocyclization gave new polybenzimidazoles, new compounds which have not been described in the literature. It has been shown that the intro duction of quinoxaline-2,3-diyl groups in the main chain of polyhetero arylene macromolecules significantly increases the solubility of the l atter in organic solvents.