Evidence of Cu
<sup>I</sup>
/Cu
<sup>II</sup>
Redox Process by X‐ray Absorption and EPR Spectroscopy: Direct Synthesis of Dihydrofurans from β‐Ketocarbonyl Derivatives and Olefins
作者:Hong Yi、Zhixiong Liao、Guanghui Zhang、Guoting Zhang、Chao Fan、Xu Zhang、Emilio E. Bunel、Chih‐Wen Pao、Jyh‐Fu Lee、Aiwen Lei
DOI:10.1002/chem.201503822
日期:2015.12.21
oxidative coupling reactions. A mechanistic study on the CuI/CuII redox process, by X‐ray absorption (XAS) and electron paramagnetic resonance (EPR) spectroscopies, has elucidated the reduction mechanism of CuII to CuI by 1,3‐diketone and detailed investigation revealed that the halide ion is important for the reduction process. The oxidative nature of the thereby‐formed CuI has also been studied by XAS
在铜催化的氧化偶联反应领域,Cu I / Cu II和Cu I / Cu III催化循环受到了激烈的争论。通过X射线吸收(XAS)和电子顺磁共振(EPR)光谱学对Cu I / Cu II氧化还原过程的机理研究,通过1,3-二酮阐明了Cu II还原为Cu I的机理并进行了详细研究揭示卤离子对于还原过程很重要。由此形成的Cu I的氧化性质XAS和EPR光谱学也进行了研究。该机理信息适用于铜催化的β-酮羰基衍生物氧化为二氢呋喃的环化反应。该协议为从容易获得的1,3-二羰基和烯烃制备高度取代的二氢呋喃环提供了理想的途径。