ozonolysis

noun

ozon·​ol·​y·​sis ˌō-(ˌ)zō-ˈnäl-ə-səs 

plural ozonolyses -ə-ˌsēz 

: the cleavage of an unsaturated organic compound at the position of unsaturation by conversion to the ozonide followed by decomposition (as by hydrolysis)