Two Distinct Mechanisms of Alkyne Insertion into the Metal-Sulfur Bond: Combined Experimental and Theoretical Study and Application in Catalysis
作者:Valentine P. Ananikov、Konstantin A. Gayduk、Nikolay V. Orlov、Irina P. Beletskaya、Victor N. Khrustalev、Mikhail Yu. Antipin
DOI:10.1002/chem.200902928
日期:2010.2.15
The present study reports the evidence for the multiple carbon–carbon bond insertion into the metal–heteroatom bond via a five‐coordinate metal complex. Detailed analysis of the model catalytic reaction of the carbon–sulfur (CS) bond formation unveiled the mechanism of metal‐mediated alkyne insertion: a new pathway of CS bond formation without preliminary ligand dissociation was revealed based on
本研究报告了通过五配位金属络合物将多个碳-碳键插入金属-杂原子键的证据。对碳-硫(CS)键形成的模型催化反应的详细分析揭示了金属介导的炔烃插入的机理:基于实验和理论研究,揭示了没有初步配体解离的CS键形成的新途径。根据这种途径,炔烃插入金属-硫键导致形成能够直接C的中间金属络合物。S还原消除。相反,通过炔烃通过涉及初步配体解离的传统途径的炔烃插入形成的中间金属络合物遭受“不适当”的几何构型,这可能会阻碍整个催化循环。开发了一种新的催化系统以解决向内部炔烃中添加立体选择性SS键的问题,据报道,具有成本效益的镍催化合成程序可形成目标乙烯基硫化物,产率高(高达99%),且性能优异。Z / E选择性(> 99:1)。