Nonheme FeIVO Complexes That Can Oxidize the C-H Bonds of Cyclohexane at Room Temperature

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• 作者：Jó ; zsef Kaizer ; Eric J. Klinker ; Na Young Oh ; Jan-Uwe Rohde ; Woon Ju Song ; Audria Stubna ; Jinheung Kim ; Eckard Mü ; nck ; Wonwoo Nam ; and Lawrence Que ; Jr.
• 刊名：Journal of the American Chemical Society
• 出版年：2004
• 出版时间：January 21, 2004
• 年：2004
• 卷：126
• 期：2
• 页码：472 - 473
• 全文大小：59K
• 年卷期：v.126,no.2(January 21, 2004)
• ISSN：1520-5126

文摘

Nonheme oxoiron(IV) complexes of two pentadentate ligands, N4Py (N,N-bis(2-pyridylmethyl)-bis(2-pyridyl)methylamine) and Bn-tpen (N-benzyl-N,N',N'-tris(2-pyridylmethyl)-1,2-diaminoethane), have been generated and found to have spectroscopic properties similar to the closely related tetradentate TPA (tris(2-pyridylmethyl)amine) complex reported earlier. However, unlike the TPA complex, the pentadentate complexes have a considerable lifetime at room temperature. This greater thermal stability has allowed the hydroxylation of alkanes with C-H bonds as strong as 99.3 kcal/mol to be observed at room temperature. Furthermore, a large deuterium KIE value is found in the oxidation of ethylbenzene. These observations lend strong credence to postulated mechanisms of mononuclear nonheme iron enzymes that invoke the intermediacy of oxoiron(IV) species.