Invention relates to novel derivates of oxaperfluoroalkylbromides of formula ??2F5O-[CF2CF(CF3)O]n-CF2CF2Br, where n has values from 1 to 5. Claimed compounds are characterized by specific density 1,79-1,81 g/cm3, have high dissolving ability with respect to oxygen. Claimed compounds which may be used as a base for preparing blood substitutes with gas transport function, as well as radiopaque contrast agents and mediums for organ preservation.