通过基启用氧化添加形成的催化相关器官铜 (III) 复合物
Wenhao Yan1, Andrew T Poore2, Lingfeng Yin1
1Department of Chemistry, University of Cincinnati, Cincinnati, Ohio 45221, United States.
这项研究揭示了铜I) 使用基形成铜III) 复合物的新途径,使得这些难以捉摸的催化中间体的详细研究成为可能.
科学领域:
- 有机金属化学
- 催化剂
- 反应机制
背景情况:
- 通过单个电子转移 (SET) 的逐步氧化添加是铜催化中提出的机制.
- 由于反应速度缓慢和不稳定,直接观察铜 (III) 中间体是具有挑战性的.
研究的目的:
- 报告一种新型的基启用途径,用于从铜基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基.
- 在催化过程中研究难以捉摸的正规铜 (III) 复合物的总体策略.
主要方法:
- 使用单个电子转移 (SET) 从Cu(I) 转移到一个aryl diazonium盐以产生aryl基.
- 用于从酸中提取基,形成基.
- 通过NMR光谱和X射线晶体学来表征得到的基III复合物.
- 通过电子磁共振 (EPR) 研究识别了Cu (II) 的中间体.
主要成果:
- 成功形成和表征了新的基 (III) 复合物,[基 (III) (CF3) (III) ].
- 证明氧化添加率与以碳为中心的基因的抽取率相关.
- 确定了一个四坐标的Cu (II) 介质, [Cu (II) (CH3CN) 2 (CF3) ].
- 通过C-C结合的Cu (III) 复合物的还原性去除,展示了催化相关性.
- 局部化轨道结合分析显示Cu-CH2结合中的联体场倒置.
结论:
- 建立了一种由基介导的铜催化阶段性氧化添加途径.
- 提供了一种可行的合成和研究过渡性铜 (III) 种的策略.
- 提供了关于正式Cu (III) 复合物的电子结构的见解.
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