Introduction of binaphthalene groups in a polymer structure (saturated and unsaturated polyesters, polyimides, polyoxazolydones and other types) increases its thermal stability in comparison with that of the respective polymers containing phenylene and biphenylene groups. A similar effect is observed in condensation polyphosphazenes obtained from monospirobinaphthalenodioxytetrachlorophosphazenes and diphenols which retain the cyclophosphazene structure. It seemed useful to study the possibility of introducing binaphthalene groups to a poly(dichloro)phosphazene structure.