Elemental Fluorine Based Syntheses of Pentafluoro Phenyl and other Aromatic Perfluoropolyether Polymers.

摘要

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.