Catalytic oxidation properties of an acid-resistant cross-bridged cyclen Fe(II) complex. Influence of the rigid donor backbone and protonation on the reactivity,Dalton Transactions

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Catalytic oxidation properties of an acid-resistant cross-bridged cyclen Fe(II) complex. Influence of the rigid donor backbone and protonation on the reactivity
Dalton Transactions ( IF 3.5 ) Pub Date : 2023-06-01 , DOI: 10.1039/d3dt00393k
Jean-Noël Rebilly ₁ , Christian Herrero ₁ , Katell Sénéchal-David ₁ , Régis Guillot ₁ , Frédéric Banse ₁

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The catalytic properties of an iron complex bearing a pentadentate cross-bridged ligand backbone are reported. With H₂O₂ as an oxidant, it displays moderate conversions in epoxidation and alkane hydroxylation and satisfactory ones in aromatic hydroxylation. Upon addition of an acid to the reaction medium, a significant enhancement in aromatic and alkene oxidation is observed. Spectroscopic analyses showed that accumulation of the expected Fe^III(OOH) intermediate is limited under these conditions, unless an acid is added to the mixture. This is ascribed to the inertness induced by the cross-bridged ligand backbone, which is partly reduced under acidic conditions.

中文翻译：

耐酸交联cyclen Fe(II)配合物的催化氧化性能。刚性供体骨架和质子化对反应活性的影响

报道了带有五齿交桥配体主链的铁配合物的催化性能。以H ₂ O ₂为氧化剂，环氧化和烷烃羟基化反应具有中等转化率，芳香族羟基化反应也具有令人满意的转化率。在向反应介质中添加酸后，观察到芳族化合物和烯烃的氧化显着增强。光谱分析表明，在这些条件下，预期的 Fe ^III (OOH) 中间体的积累是有限的，除非向混合物中添加酸。这归因于交桥配体主链引起的惰性，在酸性条件下会部分降低。

更新日期：2023-06-01

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