A novel oxidizing reagent based on potassium ferrate(VI)
A novel oxidizing reagent based on potassium ferrate(VI)
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DOI：
10.1021/jo960633p
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发表时间：
1996-09-06
影响因子：
3.6
通讯作者：
Laszlo, P
中科院分区：
文献类型：
--
作者：
Delaude, L;Laszlo, P
设计了一种新的高效高铁酸钾 (VI)(K2FeO4) 制备方法。研究了这种高价铁盐氧化非水介质中有机底物的能力。使用苯甲醇作为模型，确定了多种微孔吸附剂的催化活性。在众多硅铝酸盐类型的固体载体中，发现K10蒙脱石粘土最能实现苯甲醛的定量形成，而不会过度氧化为苯甲酸。研究了各种参数（反应时间和温度、溶剂的性质、固体试剂的制备方法）的作用。证据表明存在极性反应机制。随后的程序在室温下成功应用于一系列醇氧化成醛和酮、硫醇氧化偶联成二硫化物以及氮衍生物的氧化。在 75 摄氏度时，该试剂具有氧化活性和非活性碳氢化合物的能力。甲苯转化为苯甲醇（和苯甲醛），环烷烃也被氧化，产率显着（30-40%），生成相应的环烷醇（和环烷酮）。因此，高铁酸钾与适当的多相催化剂结合使用是一种强且环境友好的氧化剂。
A new, efficient preparation has been devised for potassium ferrate(VI)(K2FeO4). The ability of this high-valent iron salt for oxidizing organic substrates in nonaqueous media was studied. Using benzyl alcohol as a model, the catalytic activity of a wide range of microporous adsorbents was ascertained. Among numerous solid supports of the aluminosilicate type, the K10 montmorillonite clay was found to be best at achieving quantitative formation of benzaldehyde, without any overoxidation to benzoic acid, The roles of the various parameters (reaction time and temperature, nature of the solvent, method of preparation of the solid reagent) were investigated. The evidence points to a polar reaction mechanism. The ensuing procedure was applied successfully, at room temperature, to oxidation of a series of alcohols to aldehydes and ketones, to oxidative coupling of thiols to disulfides, and to oxidation of nitrogen derivatives. At 75 degrees C, the reagent has the capability of oxidizing both activated and nonactivated hydrocarbons. Toluene is turned into benzyl alcohol (and benzaldehyde), Cycloalkanes are also oxidized, in significant (30-40%) yields, to the respective cycloalkanols (and cycloalkanones). Thus, potassium ferrate, used in conjunction with an appropriate heterogeneous catalyst, is a strong and environmentally friendly oxidant.