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The reaction of Fe(CF3 SO3 )2 (PyNMe3 ) with excess peracetic acid at -40 °C leads to the accumulation of a metastable compound that exists as a pair of electromeric species, Fe(III) (OOAc)(PyNMe3 )(2+) and Fe(V) (O)(OAc)(PyNMe3 )(2+) , in fast equilibrium. Stopped-flow UV/Vis analysis confirmed that oxygen atom transfer (OAT) from these electromeric species to olefinic substrates is exceedingly fast, forming epoxides with stereoretention. The impact of the electronic and steric properties of the substrate on the reaction rate could be elucidated, and the relative reactivities determined for the catalytic oxidations could be reproduced by kinetic studies. The observed fast reaction rates and high selectivities demonstrate that this metastable compound is a truly competent OAT intermediate of relevance for nonheme iron catalyzed epoxidations.
Serrano‐Plana et al. (2016) studied this question.