| 摘要 |
A process for preparing (per)fluorohalogenethers having general formula: <CHEM> wherein: A and A', equal to or different from each other, are selected among Cl, Br and H; m=1, 2; n=0, 1; R' is a C1-C3 (per)fluoro-alkyl substituent; R is a (per)fluoropolyether substituent; z and z' are 1 or zero, X1=F, CF3; by reaction of carbonyl compounds having formula: (R')n-C(O)(F)q(CF2ORI) wherein: R' and n are as above; q=0, 1; RI is a (per)fluoro-polyether substituent; in liquid phase, with elemental fluorine and with olefinic compounds of formula: CAF=CA'F2 wherein A and A' are as above, at temperatures from -120 DEG C to -20 DEG C, preferably from -100 DEG C to -40 DEG C. |
