Process for preparing hexafluoro-C4-alkyl compounds

摘要

Prodn. of hexafluorobutane or -butene cpds. of formulaCF3-A-CF3 (I) comprises contacting a trifluoroethane cpd. of formula CF3CXYZ (II) in the liq. or gas phase with a metal and/or a metal cpd.; A = CH2CH2 or CX=CX; X = H, Cl, Br or I; Y and Z = H, F, Cl, Br or I, provided that X, Y and Z are not all H.