Elemental Fluorine Based Syntheses of Pentafluoro Phenyl and Other AromaticPerfluoropolyether Polymers

摘要

As an approach to the preparation of organic molecules with very highthermooxidative stability, a study was carried out on the preparation of perfluorinated aromatic compounds by liquid-phase direct fluorination of aromatic hydrocarbon precursors followed by reductive defluorination. Diphenylether was converted to a perfluoro(dicyclohexylether) intermediate, however reductive defluorination afforded perfluoro(benzofuran) rather than perfluoro(diphenylether). By contrast, biphenyl was converted in high yield to perfluoro(dicyclohexyl) which, upon reductive defluorination afforded perfluoro(diphenyl). Diphenyl ketone was converted to perfluoro(dicyclohexyl) ketone, reductive defluorination of which is under investigation. Similarly, the