Accession Number : ADA284102


Title :   Elemental Fluorine Based Syntheses of Pentafluoro Phenly and other Aromatic Perfluoropolyether Polymers


Descriptive Note : Annual rept. 1 Feb 1993-31 Jan 1994


Corporate Author : TEXAS UNIV AT AUSTIN DEPT OF CHEMISTRY


Personal Author(s) : Lagow, Richard J


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a284102.pdf


Report Date : 31 Jan 1994


Pagination or Media Count : 32


Abstract : Since we successfully obtained a fused perfluoro (benzofuran) from perfluoro (dicyclohexyl ether), reductive defluorination of the perfluorinated ethers containing three perfluoro (cyclohexyl) groups would be interesting. The three isomers of o-, m-, and p-perfluoro (dicyclohexanoxyl cyclohexane) were prepared by liquid-phase direct fluorination of o-, m-, and p-diphenoxyl benzene. After several runs of liquid-phase direct fluorination, enough amount of o-perfluoro (dicyclohexanoxyl cyclohexane) was collected to carry out the following reductive defluorination. The reductive defluorination was carried out from -70 to 70 degree for 2 days, but the ortho-ether, however, kept unreacted. One of the reasons for that is perhaps steric hindrance. Reductive defluorination of the meta- and para- ethers are under investigation.


Descriptors :   *POLYMERS , BENZENE , SYNTHESIS(CHEMISTRY) , PHASE STUDIES , ISOMERS , LIQUID PHASES , ETHERS , MOLECULAR STRUCTURE , CYCLOHEXANES , MOLECULAR ISOMERISM , FURANS , OXIDATION REDUCTION REACTIONS , FLUORINATION


Subject Categories : Polymer Chemistry
      Atomic and Molecular Physics and Spectroscopy


Distribution Statement : APPROVED FOR PUBLIC RELEASE