Patent ID: 8247625

Claim:
A process for making RR 1 R 2 CCR 1 R 2 F wherein R is selected from the group consisting of CH 3 , CH 2 F, C 2 H 4 F, and F(CF 2 ) n CH 2 CH 2 where n is an integer from 1 to 10, each R 1 is independently selected from the group consisting of H, Cl, F and CF 3 , and each R 2 is independently selected from the group consisting of H, F and CF 3 , comprising: reacting RF with R 1 R 2 C═CR 1 R 2 in the presence of SbF 5 to produce a product mixture comprising RR 1 R 2 CCR 1 R 2 F, wherein the reaction temperature is from about −60° C. to below −10° C., provided that total number of carbon atoms in R 1 R 2 C═CR 1 R 2 is 5 or less.