Abstract
The present study is a part of an effort to understand the mechanism of the oxidative chlorination, as performed by a biomimetic non-heme iron complex. This catalytically active complex is generated from a peroxide and [(TPA)FeIIICl2]+ [TPA is tris(2-pyridylmethyl)amine]. The reaction catalyzed by [(TPA)FeCl2]+/ROOH involves either [(TPA)ClFeV=O]2+ or [(TPA)ClFeIV=O]+ as an intermediate. On the basis of density functional theory the reaction of these two possible catalysts with cyclohexane is investigated. A question addressed is how the competing hydroxylation of the substrate is avoided. It is demonstrated that the high-valent iron complex [(TPA)Cl–FeV=O]2+ is capable of stereospecific alkane chlorination, based on an ionic rather than on a radical pathway. In contrast, the results found for [(TPA)ClFeIV=O]+ cannot explain the experimental findings. In this case the transition states for chlorination and hydroxylation are energetically too close. The exclusive chlorination of the substrate by Cl–FeIV=O may be explained by an indirect or a direct effect, altering the position of the competing rebound barriers.
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Noack, H., Siegbahn, P.E.M. Theoretical investigation on the oxidative chlorination performed by a biomimetic non-heme iron catalyst. J Biol Inorg Chem 12, 1151–1162 (2007). https://doi.org/10.1007/s00775-007-0284-0
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DOI: https://doi.org/10.1007/s00775-007-0284-0