Polychlorinated (PCB) biphenyls are very stable materials of low flammability and are exceptionally persistent in the environment. This fact coupled with their carcinogenicity,'quire that they be eliminated from several applications. Polychlorinated phenylpyridines may be considered as possible substitutes as they are less hydrophobic and more susceptible to biodegradation; indeed, the nitrogen should datively easily be oxidized, protonated and ...
