Claimed are fluorous telomeric compounds of the formula: R.sub.F-A-[CH.sub.2].sub.cCR.sub.2R.sub.3-Z where R.sub.F is a perfluoroalkyl radical of 1 to 20 carbon atoms, A is a group of the formulae ##STR00001## R.sup.1 is CF.sub.3 OR.sub.4, Cl, Br or I, R.sub.2 and R.sub.3 are H, alkyl or aryl R.sub.4 is perfluoromethyl, perfluoropropyl or perfluoropropyloxypropyl X and Y are H, Cl or F Z is --OH, --OCOCH.dbd.CH.sub.2 or --OCOCCH.sub.3.dbd.CH.sub.2 a is from 0 to 10, b is from 1 to 30 and c is from 1 to 30. These compounds are copolymerized with further monomers. The copolymers thus obtained are useful for water-, oil- and soil-repellent finishing of fibrous substrates.