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合成[Fe2(μ-O) 2钻石芯的基质触发激活,用于C-H键裂解
Genqiang Xue1, Alexander Pokutsa, Lawrence Que
1Department of Chemistry and Center for Metals in Biocatalysis, University of Minnesota, Minneapolis, Minnesota 55455, USA.
Journal of the American Chemical Society
|September 9, 2011
概括
合成铁复合物模仿甲单氧基酶酶的作用.
科学领域:
- 生物有机化学 生物有机化学
- 有机金属化学 有机金属化学
- 酶的机制 酶的机制
背景情况:
- 溶性甲单氧化酶 (sMMO-Q) 酶利用一个[Fe(IV) 2 ((μ-O) 2) 的钻石核来氧化甲.
- 由于缺乏明确的合成模型,对高价值[Fe2(μ-O) 2]核的机械研究是有限的.
- 了解这些机制对于相关的二铁基酶和脱酶至关重要.
研究的目的:
- 为了研究合成[Fe(III) Fe(IV) ((μ-O) 2) 复合物的C-H键氧化激活.
- 阐明水或酒精激活基质的机制.
- 探索高价值铁氧核在C-H键裂解中的反应性.
主要方法:
- 合成[Fe(III) Fe(IV) ((μ-O) 2) 复合体,由四酸三酸 (pyridyl-2-methyl) 胺连接体提供支持.
- 对C-H键氧化反应的动力学研究.
- 反应中间体的光谱表征 (EPR).反应中间体.
- 计算研究 (DFT) 支持机械学建议.
主要成果:
- 水和酒精基板激活合成[Fe (III) Fe (IV) Fe (μ-O) ]复合体,使其在C-H氧化过程中获得数量级的活性.
- 激活是通过路易斯基攻击进行的,导致环开放的[X-Fe(III) -O-Fe(IV) =O]物种.
- 一种甲氧化物添加物很容易经历分子内C-H裂变,产生甲.
- 与母体复合体相比,激活复合体对C-H氧化反应性增加了3.6 × 10 ^ 7倍.
结论:
- 易斯基对[Fe(III) Fe(IV) ((μ-O) 2) 核心的攻击会产生一种高反应性物种,能够强烈地分裂C-H键.
- 高旋转Fe(IV) = O单位是H原子抽象的活性物种.
- 核心异构化是sMMO-Q选择性激活甲的C-H键的一个潜在策略.
相关概念视频
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Bond Dissociation Energy and Activation Energy
Bond energy is the energy required to break a bond homolytically. These values are usually expressed in units of kcal/mol or kJ/mol and are referred to as bond dissociation energies when given for specific bonds or average bond energies when indicated for a given type of bond over many compounds. Firstly, the bond dissociation energy for a single bond is weaker than that of a double bond, which in turn is weaker than that of a triple bond. Secondly, hydrogen forms relatively strong bonds with...
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