N-fluoro-compounds. Part VI. Preparation and some reactions of perfluoro-NN′-difluoropiperazine; cross-linking of a nitroso rubber

Abstract

Perfluoro-NN′-difluoropiperazine, prepared by electrochemical fluorination of piperazine, reacts with aqueous potassium iodide to give oxalic acid and with perfluorocyclobutene in the presence of u.v. light to yield perfluoro-(Ncyclobutyl-N′-fluoropiperazine). Photolysis of the NN′-difluoro-compound in silica, either alone or in the presence of oxygen, produces a polymeric wax that yields a nitroxide-containing, purplish-blue liquid when heated andean be used to cross-link elastomeric trifluoronitrosomethane–tetrafluoroethylene–hexafluorobutadiene copolymers.