METHOD OF SYNTHESIS OF PERFLUORINATED ETHERS WITH TERMINAL FUNCTIONAL GROUPS Russian patent published in 2002 - IPC

FIELD: organic chemistry, chemical technology. SUBSTANCE: invention relates to method of synthesis of perfluorinated ethers with terminal functional groups of the formula: R_fO[CF(CF₃)-CF₂O]_n-CF(CF₃)-COX where R_f is C₁-C₈-perfluoroalkyl; n = 0-3; X is F or OH which are used as intermediate compounds for synthesis of perfluoroalkylvinyl esters, surface- active substances, chemically and thermally stable liquids, polymers. Method involves interaction of hexafluoropropene oxide with perfluorocarboxylic acid fluoroanhydride or with perfluoroketone or by oligomerization of hexafluoropropene oxide in medium of polar organic solvent in the presence of N,N',N''- hexaalkyl-substituted guanidium halogenide as a catalyst of the formula A where R-R³ means C₁-C₇-alkyl; X means Cl or F or its mixture with alkaline metal fluoride. The yield of synthesized perfluoroalkoxypropionyl fluorides is 87- 92%. If necessary, the latter can be converted to the corresponding carboxylic acids by interaction with water. The yield of perfluoroalkoxypropionic acids is 94-95%. EFFECT: improved method of synthesis, increased yield. 2 cl, 1 tbl, 5 ex