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Iron-catalyzed halogenation of alkanes: Modeling of nonheme halogenases by experiment and DFT calculations

机译:铁催化的烷烃卤化:通过实验和DFT计算对非血红素卤化酶进行建模

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摘要

When the dichloroiron(II) complex of the tetradentate bispidine ligand L = 3, 7-dimethyl-9-oxo-2, 4-bis(2pyridyl)-3, 7-diazabicyclo[3.3.1]nonane1, 5-dicarboxylate methyl ester is oxidized with H_2O_2, tBuOOH, or iodosylbenzene, the high-valent Fe=O complex efficiently oxidizes and halogenates cyclohexane. Kinetic D isotope effects and the preference for the abstraction of tertiary over secondary carbon-bound hydrogen atoms (quantified in the halogenation of adamantane) indicate that C-H activation is the rate-determining step. The efficiencies (yields in stoichiometric and turnover numbers in catalytic reactions), product ratios (alcohol vs. bromo- vs. chloroalkane), and kinetic isotope effects depend on the oxidant. These results suggest different pathways with different oxidants, and these may include iron(IV)- and iron(V)-oxo complexes as well as oxygen-based radicals.
机译:当四齿联吡啶配体L的二氯铁(II)配合物L = 3时,7-二甲基-9-oxo-2,4-双(2吡啶基)-3,7-二氮杂双环[3.3.1]壬烷1,5-二羧酸甲酯被H_2O_2,tBuOOH或碘基苯氧化后,高价Fe = O络合物有效氧化并卤化环己烷。动力学D同位素效应和对叔碳原子的优先提取,优先于仲碳原子结合的氢原子(在金刚烷的卤化反应中进行了量化),表明C-H活化是决定速率的步骤。效率(催化反应的化学计量收率和周转率),产物比率(醇,溴,氯代烷),动力学同位素效应取决于氧化剂。这些结果表明使用不同氧化剂的途径不同,其中可能包括铁(IV)和铁(V)-氧配合物以及基于氧的自由基。

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