PROCESS FOR THE PURIFICATION OF ALPHA,OMEGA-DIIODOPERFLUORINATED COMPOUNDS

摘要

The invention concerns a process for purifying a,?-diiodo?erfluorinatcd compounds of formula 1-(CF2CF2Y)m-I comprising contacting an impure a,?-diiodopcrfluorinated compound with a suitable sequestering agent, with formation of a reversible adduct and separating the a,?- diiodoperfluorinated compound from the adduct itself. Diammonium dihalogenids of the general formula [R1,2,3N-(CH2)n-NR4,5,6]2*2X (R1-6=alkyl C1-C6n=8-26, X=I,Br, Cl) also called "methonium compounds" are the preferred sequestering agents.