Iron complexes [((S,S)-PDP*)Fe^III(μ-OH)₂Fe^III((S,S)-PDP*)](OTf)₄ (6), (S,S)-PDP* = N,N′-bis(3,5-dimethyl-4-methoxypyridyl-2-methyl)-(S,S)-2,2′-bipyrrolidine, and [(TPA*)Fe^III(μ-OH)₂Fe^III(TPA*)](OTf)₄ (7), TPA* = tris(3,5-dimethyl-4-methoxypyridyl-2-methyl)amine, catalyze the selective hydroxylation of alkanes with H₂O₂ and peroxycarboxylic acids. Using in situ EPR spectroscopy, direct kinetic data on the reactivity of the iron-oxo intermediates formed in the catalyst systems 6,7/oxidant/RCOOH (RCOOH = acetic acid (AA) or 2-ethylhexanoic acid (EHA)) toward cyclohexane have been obtained for the first time, thus corroborating their key role in the selective CH oxidation. Intermediates 6a^AA, 6a^EHA and 7a₂^EHA with proposed structures [((S,S)-PDP*)Fe^VO(OC(O)CH₃)]²⁺, [((S,S)-PDP*)Fe^VO(OC(O)R)]²⁺ and [(TPA*)Fe^VO(OC(O)R)]²⁺ (RCOOH = EHA) display similar EPR spectra (g₁ = 2.07, g₂ = 2.01, g₃ = 1.96) and have close reactivities toward cyclohexane at −70 °C (k₂ = 2–3 × 10⁻³ M⁻¹ s⁻¹).

铁络合物[（（（S，S）-PDP *）Fe ^III（μ -OH）₂ Fe ^III（（S，S）-PDP *）]（OTf）₄（6），（S，S）-PDP * =  N，N'-双（3,5-二甲基-4-甲氧基吡啶基-2-甲基）-（S，S）-2,2'-联吡咯烷和[（TPA *）Fe ^III（μ -OH）₂ Fe ^III（TPA *）]（OTf）₄（7），TPA * =三（3,5-二甲基-4-甲氧基吡啶基-2-甲基）胺，催化H ₂ O ₂对烷烃的选择性羟化反应和过氧羧酸。在形成于催化剂体系中的铁氧代中间体的反应性使用原位EPR光谱，直接动力学数据6，7 /氧化剂/ RCOOH（RCOOH =乙酸（AA）或2-乙基己酸（EHA））朝向环己烷具有首次获得了这种化合物，从而证实了它们在选择性C H氧化中的关键作用。中间体6a ^AA，6a ^EHA和7a ₂ ^EHA具有建议的结构[[（（S，S）-PDP *）Fe ^V O（OC（O）CH ₃）] 2 ⁺，[[（（S，S）-PDP *） Fe ^V O（OC（O）R）] ²⁺和[（TPA *）Fe ^V O（OC（O）R）] ²⁺（RCOOH = EHA）显示相似的EPR谱图（g ₁  = 2.07，g ₂  = 2.01，g ₃  = 1.96）并与环己烷具有紧密的反应在-70°C（k ₂  = 2-3×10 ^-3  M ^-1  s ^-1）。