The rate constants and kinetic coeffi cients of inhibition (f kin ) for olefi ns oxidized with the transition metal compounds (M n ) were measured by highly sensitive microvolumometry at 323 K in combination with kinetic modeling. The cyclic mechanism of the reactions of hydr oxyl radicals with M n leading to the multiple chain termination was confi rmed as indicated by the observed eff ect of long-term inhibition of the oxidation of the substrates with M n and obtained values of f kin > 10 2 .