Iron(II) Complexes with Bio-Inspired N,N,O Ligands as Oxidation Catalysts: Olefin Epoxidation andcis-Dihydroxylation
作者:Pieter C. A. Bruijnincx、Inge L. C. Buurmans、Silvia Gosiewska、Marcel A. H. Moelands、Martin Lutz、Anthony L. Spek、Gerard van Koten、Robertus J. M. Klein Gebbink
DOI:10.1002/chem.200700573
日期:2008.1.28
iron(II) coordination chemistry of the ligands 3,3-bis(1-methylimidazol-2-yl)propionate (L1) and its neutral propyl ester analogue propyl 3,3-bis(1-methylimidazol-2-yl)propionate (PrL1). The molecular structures of two iron(II) complexes with PrL1 were determined and two different coordination modes of the ligand were observed. In [Fe(II)(PrL1)(2)](BPh(4))(2) (3) the ligand is facially coordinated to the metal
Iron-Catalyzed Olefin Epoxidation in the Presence of Acetic Acid: Insights into the Nature of the Metal-Based Oxidant
作者:Rubén Mas-Ballesté、Lawrence Que
DOI:10.1021/ja075115i
日期:2007.12.1
[BPMEN = N,N'-bis-(2-pyridylmethyl)-N,N'-dimethyl-1,2-ethylenediamine; TPA = tris-(2-pyridylmethyl)amine] catalyze the oxidation of olefins by H2O2 to yield epoxides and cis-diols. The addition of acetic acid inhibits olefin cis-dihydroxylation and enhances epoxidation for both 1 and 2. Reactions carried out at 0 degrees C with 0.5 mol % catalyst and a 1:1.5 olefin/H2O2 ratio in a 1:2 CH3CN/CH3COOH
Olefin<i>cis</i>-Dihydroxylation and Aliphatic CH Bond Oxygenation by a Dioxygen-Derived Electrophilic Iron-Oxygen Oxidant
作者:Sayanti Chatterjee、Tapan Kanti Paine
DOI:10.1002/anie.201502229
日期:2015.8.3
metal–oxygen oxidants to carry out O2‐dependent transformation reactions. However, the selective oxidation of CH and CC bonds by biomimetic complexes using O2 remains a major challenge in bioinspired catalysis. The reactivity of iron–oxygen oxidants generated from an FeII–benzilate complex of a facial N3 ligand were thus investigated. The complex reacted with O2 to form a nucleophilic oxidant, whereas
许多含铁酶涉及金属-氧氧化剂,以进行依赖于O 2的转化反应。然而,C的选择性氧化通过仿生络合物H和CC键使用了O 2保持在仿生催化的一个重大挑战。因此研究了由面部N 3配体的Fe II-苯甲酸酯络合物生成的铁-氧氧化剂的反应性。该络合物与O 2反应形成亲核氧化剂,而在路易斯酸的存在下产生被外部底物截获的亲电子氧化剂。基于机理研究,亲核的Fe II有人提议由苯甲酸酯络合物形成–hydroperoxo物种,该复合物在路易斯酸存在下经历杂化OO键裂解,生成Fe IV –oxo–hydroxo氧化剂。亲电子氧化铁可选择性地将硫化物氧化为亚砜,将烯烃氧化为顺式二醇,并羟基化烷烃的CH键,包括环己烷的CH键。
Olefin-Dependent Discrimination between Two Nonheme HOFe<sup>V</sup>O Tautomeric Species in Catalytic H<sub>2</sub>O<sub>2</sub>Epoxidations
作者:Anna Company、Yan Feng、Mireia Güell、Xavi Ribas、Josep M. Luis、Lawrence Que、Miquel Costas
DOI:10.1002/chem.200802597
日期:2009.3.23
water incorporation into products (up to 75 %) is observed in epoxidation reactions with H2O2 by a bioinspired nonheme iron catalyst. A surprising substrate‐dependent incorporation of water is observed, and is proposed to arise from fast equilibrium betweentwo high‐valent HOFeVO isomeric species exhibiting different reactivity.
湿式加氧酶模型:在通过生物启发的非血红素铁催化剂与H 2 O 2进行的环氧化反应中,观察到前所未有的高水平的水混入产品(高达75%)。水的令人惊讶的衬底依赖性掺入观察到的,并提出了两个高价HO之间从快速平衡出现铁V表现出不同的反应性O异构体物种。
Selective transition-metal-free vicinal cis-dihydroxylation of saturated hydrocarbons
作者:Luis Bering、Andrey P. Antonchick
DOI:10.1039/c6sc03055f
日期:——
A transition-metal-free cis-dihydroxylation of saturated hydrocarbons under ambient reaction conditions has been developed. The described approach allows a direct and selective synthesis of vicinal diols. The new reaction thereby proceeds via radical iodination and a sequence of oxidation steps. A broad scope of one-pot dual C(sp3)–H bond functionalization for the selective synthesis of vicinal syn-diols