The potential energy profile in Figure shows also the follow-up steps all the way to CO2 expulsion and olefin formation. The changes in orbital occupation during all the steps of Figure are shown in Figure . Thus, the first H-abstraction step (RC→IM1) transforms Cpd I to Cpd II (Fe(IV)OH), leaving a •CβH radical carrying a CO2 -group in an -position. At the same time, W1