Abstract: Telomers are prepared by reacting chlorotrifluoroethylene with 1,2-dibromo-2-chlorotrifluoroethane (CBrClFCF.sub.2 Br) in the presence of a redox catalyst system comprising a metal halide selected from the group consisting of FeCl.sub.3, FeBr.sub.3, CuBr.sub.2, CuCl.sub.2, TiCl.sub.4, VCl.sub.3, and NiCl.sub.2, and a reducing agent selected from the group consisting of Fe, Ni, Cu, Ti, V and benzoin. The preferred catalyst system is ferric chloride and nickel. The telomers of this invention have the structural formula ##STR1## where n is in the range of 1 to 10, and are useful for preparing non-flammable hydraulic fluids.