Process for preparing hydrofluoroethers

摘要

Process for obtaining hydrofluoroethers of formula (I): A-(Rf)n0-CF(Rf1)-O-Rh wherein: n0 is zero or 1; Rf is a bivalent radical: C1-C20 (per)fluoroalkylene, optionally containing one or more oxygen atoms; -CFW'O-(Rf2)-CFW-, wherein W and W', equal or different, are F, CF3; Rf2 is a (per)fluoropolyoxyalkylene; Rf1 is F or a C1-C10 (per)fluoroalkyl or (per)fluorooxyalkyl radical; Rh is a C1-C20 linear, branched, saturated or unsaturated alkyl, or C7-C20 alkylaryl, A = F, (Rh2O)-CF(Rf4)-, -C(O)F, wherein Rh2, equal to or different from Rh, has the Rh meanings and Rf4, equal to or different from Rf1, has the Rf1 meanings; wherein a mono- or bifunctional carbonyl compound of formula (IV) : B-Rf-C(O)Rf1 B being F or -C(O)Rf4, Rf, Rf1 and Rf4 being as above, is reacted with at least one equivalent of a fluoroformate of formula (III) : R-OC(O)F wherein R = Rh or Rh2 as above defined; in the presence of an ion fluoride compound (catalyst) and of a dipolar aprotic organic compound, liquid and inert under the reaction conditions.