Revealing the Structure and Reactivity of the Active Species in the FeCl2 -TBHP System: Case Study on Alkene Oxidation

A mechanism involving a quintet ferryl [Fe-IV=O] species has been disclosed for the oxidation of alkene under the FeCl2-TBHP system. Both theoretical and experimental results suggested that the quintet ferry' species [Fe-IV=O] was produced by the reaction of FeCl2 with TBHP. A Mulliken atomic spin density distribution on [Fe-IV=O] showed that the O site has strong radical character and could easily react with alkene to form a carbon radical intermediate. This radical could be further oxidized by TBHP to lead to the C=C bond cleavage of alkene.