Oxidative Addition of Aryl Electrophiles to a Prototypical Nickel(0) Complex: Mechanism and Structure/Reactivity Relationships
作者:Sonia Bajo、Gillian Laidlaw、Alan R. Kennedy、Stephen Sproules、David J. Nelson
DOI:10.1021/acs.organomet.7b00208
日期:2017.4.24
Detailed kinetic studies of the reaction of a model Ni0 complex with a range of aryl electrophiles have been conducted. The reactions proceed via a fast ligand exchange pre-equilibrium, followed by oxidative addition to produce either [NiIX(dppf)] (and biaryl) or [NiII(Ar)X(dppf)]; the ortho substituent of the aryl halide determines selectivity between these possibilities. A reactivity scale is presented
已经对模型 Ni0 络合物与一系列芳基亲电子试剂的反应进行了详细的动力学研究。反应通过快速配体交换预平衡进行,然后氧化加成生成 [NiIX(dppf)](和联芳基)或 [NiII(Ar)X(dppf)];芳基卤化物的邻位取代基决定了这些可能性之间的选择性。提出了一个反应性等级,其中一系列底物按照它们经历氧化添加的速率进行定量排序。氧化加成速率与原型交叉偶联反应中的转化率松散相关。在动力学实验中导致 NiI 产物的底物在催化条件下会产生更多的同源偶联产物。