Accession Number : ADA294930

Title :   Elemental Fluorine Based Syntheses of Pentafluoro Phenyl and Other Aromatic Perfluoropolyether Polymers.

Descriptive Note : Final rept. 1 Feb 92-31 Jan 95,

Corporate Author : TEXAS UNIV AT AUSTIN DEPT OF CHEMISTRY

Personal Author(s) : Lagow, Richard J.

PDF Url : ADA294930

Report Date : 31 JAN 1995

Pagination or Media Count : 74

Abstract : As an approach to the preparation of organic molecules with very high thermooxidative 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 o-, m-, and p- isomers of diphenoxybenzene were successfully fluorinated to the corresponding perfluoro(dicyclohexanoxylcyclohexanes), the reductive defluorination of which is under investigation. jg

Descriptors :   *POLYMERS, *FLUORINE, STABILITY, MOLECULES, PRECURSORS, THERMAL STABILITY, ISOMERS, LIQUID PHASES, OXIDATION, HYDROCARBONS, ORGANIC COMPOUNDS, ETHERS, AROMATIC COMPOUNDS, FLUOROPOLYMERS, CYCLIC COMPOUNDS, FLUORINATION, BENZYL RADICALS, KETONES, BIPHENYL, PHENYL ETHER.

Subject Categories : Inorganic Chemistry
      Organic Chemistry
      Physical Chemistry
      Polymer Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE