Patent ID: 7161030

Claim:
A process for the preparation or hydrofluoroethers of formula: T-CFX′—O—R f —CFX-T′ (II) wherein: T=CH 3 ; X,X′, equal to or different from each other, are selected between F, CF 3 ; T′=F, Cl, H, C 1 –C 3 perfluoroalkyl, CH 3 , CH 2 OH, COCl, CHO, CO 2 H; R f is selected from: C 2 –C 15 perfluoroalkylene; —(C 2 F 4 O) m (CF 2 CF(CF 3 )O) n (CF 2 O) p (CF(CF 3 )O) g — wherein the sum n+m+p+q ranges from 2 to 200, the (p+q)/(m+n+p+q) ratio is lower than or eaual to 10:100, the n/m ratio ranges from 0.2 to 6; m, n, p, q are equal to or different from each other and when m, n range from 1 to 100, then p, q range from 0 to 80; the units with n, m, p, q indexes being statistically distributed along the chain; —(CF 2 CF 2 CF 2 O) r —wherein r ranges from 2 to 200, —(CF(CF 3 )CF 2 O) s —wherein s ranges from 2 to 200, comprising the reduction of the formula (III) corresponding precursors: T″-CFX′—O—R f —CFX-T′″ (III) wherein: T″=COCl, T′″=F, C 1 –C 3 perfluoroalkyl, COCI, H, CI, X, X′, R f are as defined in formula, carried out with gaseous hydrogen in the presence of a catalyst formed by supported platinum, at a temperature in the range 20° C.–15° C., at a pressure between 1 and 50 atm.