[FeII(NCCH3)(NTB)](OTf)2 (NTB
= tris(2-benzimidazoylmethyl)amine, OTf = trifluoromethanesulfonate)
was reacted with difluoro(phenyl)-λ3-iodane (PhIF2) in the presence of a variety of saturated hydrocarbons,
resulting in the oxidative fluorination of the hydrocarbons in moderate-to-good
yields. Kinetic and product analysis point towards a hydrogen atom
transfer oxidation prior to fluorine radical rebound to form the fluorinated
product. The combined evidence supports the formation of a formally
FeIV(F)2 oxidant that performs hydrogen atom
transfer followed by the formation of a dimeric μ-F–(FeIII)2 product that is a plausible fluorine atom
transfer rebound reagent. This approach mimics the heme paradigm for
hydrocarbon hydroxylation, opening up avenues for oxidative hydrocarbon
halogenation.
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