Abstract. Structural polymer transitions, caused by non-radiative processes, are considered in the frameworks of both nonlinear solitonic excitations as well as the non-radiative quantum resonance. Our results show that the latter approach provides a much better description of cascade transport phenomena of double CC bonds in non-saturated hydrocarbons, kinetics of photochemical reactions of the isomer polymer transitions and some related phenomena. This fact clearly demonstrates that for a deeper understanding and insight into these processes the fully quantum description is indispensable