Pathway 3 is based on the observation that the protonated Cpd II (the hydroxoiron(IV) intermediate), which was observed in the decay kinetics, has a very slow conversion to the resting state, thus implying a relatively stable Cpd II which accepts a single electron transfer (SET) from the substrate, which in turn, loses CO2 and form the terminal olefin. However, this pathway does not explain why this mechanism should be utilized only by P450OleT but not by the very similar P450BSβ enzyme. Thus, mechanistic studies did not resolve the origins of decarboxylation in P450OleT, and the identity of the factors which might drive P450OleT to adopt a different mechanistic pathway vis-à-vis P450SPα and P450BSβ. The industrial uses of olefins lend importance to this specific propensity of OleT to produce olefins.