Au-iClick mirrors the mechanism of copper catalyzed azide-alkyne cycloaddition (CuAAC).

Au-iClick mirrors the mechanism of copper catalyzed azide-alkyne cycloaddition (CuAAC).
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Au-iClick 反映了铜催化叠氮化物-炔环加成 (CuAAC) 的机理。

DOI:
10.1039/c5dt02405f
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发表时间:
2015
影响因子:
4
通讯作者:
A. Veige
A. Veige
中科院分区:
化学2区
文献类型:
--
作者:
A. R. Powers;I. Ghiviriga;K. Abboud;A. Veige

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本报告概述了金叠氮化物与金乙酰基化物生成二金三唑酸盐的反应机理。二金三唑酸配合物的分离为两种铜离子在CuAAC中的作用提供了强有力的支持。此外,动力学研究表明,Au(i)-N3和Au(i)-C[三键,长度为m-dash]的C-R反应都是一级反应,因此总体上是二级反应。ρ = 1.02(5)的Hammett图表示吸电子基团通过促进π配合物中第二个金离子的配位而加速环加成。在反应中加入游离三苯基膦的速率抑制表明配体解离是反应的先决条件。机理结论反映了对CuAAC反应提出的结论。
This report outlines the investigation of the iClick mechanism between gold(i)-azides and gold(i)-acetylides to yield digold triazolates. Isolation of digold triazolate complexes offer compelling support for the role of two copper(i) ions in CuAAC. In addition, a kinetic investigation reveals the reaction is first order in both Au(i)-N3 and Au(i)-C[triple bond, length as m-dash]C-R, thus second order overall. A Hammett plot with a ρ = 1.02(5) signifies electron-withdrawing groups accelerate the cycloaddition by facilitating the coordination of the second gold ion in a π-complex. Rate inhibition by the addition of free triphenylphosphine to the reaction indicates that ligand dissociation is a prerequisite for the reaction. The mechanistic conclusions mirror those proposed for the CuAAC reaction.
DOI: 10.1021/om300542a
发表时间: 2012-08-13
期刊: ORGANOMETALLICS
影响因子: 2.8
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