METHOD OF PREPARING POLYFLUORINATED ALKOXYPROPIONYL FLUORIDES Russian patent published in 2004 - IPC

FIELD: organic synthesis. SUBSTANCE: polyfluorinated alkoxypropionyl fluorides having general formula 1: (1), where Rf represents linear or branched C₁-C₉,-perfluoroalkyl or C₁-C₉-perfluoroalkoxyalkyl, or hydrogen atom, are prepared by reaction of hexafluoropropene oxide with appropriate polyfluorocarboxyl fluoride in organic medium consisting of two components, from which one is a polar aprotic solvent, in presence of catalyst. Second component, constituting 80-90 wt % of the organic medium, is perfluorinated nonpolar solvent selected from perfluorinated cyclic C₇-C₁₁-hydrocarbons or aliphatic C₆-C₉-hydrocarbons capable of extracting acid fluorides I formed in reaction. Catalyst is N,N,N',N'-tetrasubstituted diaminomethane of formula: , where R¹-R⁴ represent linear or branched C₁-C₆-alkyl or C₁-C₆,-perfluoroalkyl, or radical -C₂H₄OH, or pairs R¹ and R² and R³ and R⁴, together with nitrogen atom to which they are attached, may form heterocyclic residue optionally containing one more heteroatom (oxygen) and substituted by one or several alkyl radicals. EFFECT: enabled selective preparation of desired products with high yields and enabled carrying out process under atmospheric pressure. 2 cl, 1 tbl, 8 ex