Hydrofluoroethers having at least one hydrogenated -OCFX'CH3 end group wherein X'=F, CF3 and their preparation process

Abstract

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 0H, COC 1 , CHO, CO 2 H; R f is a perfluoroalkylene or a perfluoropolyoxyalkylene and respective preparation process by reduction with hydrogen in the presence of a platinum catalyst supported on metal fluorides of the corresponding compounds with at least one —COCl end group.

1 . 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) q — 
 wherein  
 the sum n+m+p+q ranges from 2 to 200,  
 the (p+q)/(m+n+p+q) ratio is lower than or equal 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  
 
 
   
   
       2 . Hydrofluoroethers according to  claim 1 , wherein R f  is selected from the following structures: 
 —(CF 2 CF 2 O) m —(CF 2 O) p —,    —(CF 2 CF(CF 3 )O) n —(CF 2 O) p —(CF(CF 3 )O) q.      
   
   
       3 - 7 . (canceled)  
   
   
       8 . Hydrofluoroethers of  claim 1 , wherein the (p+q)/(m+n+p+q) ratio is between 0.5:100 and 4:100.  
   
   
       9 . Hydrofluoroethers of  claim 1 , wherein the n/m ratio ranges from 0.5 to 3.  
   
   
       10 . Hydrofluoroethers of  claim 1 , wherein when m, n range from 1 to 80, then p, q range from 0 to 80.  
   
   
       11 . Hydrofluoroethers of  claim 10 , wherein when m, n range from 1 to 80, then p, q range from 0 to 50.