Activation Mechanism of Nickel(0) <i>N</i>-Heterocyclic Carbene Catalysts Stabilized by Fumarate Ligands
作者:Michael T. Robo、Amie R. Frank、Ellen Butler、Alex J. Nett、Santiago Cañellas、Paul M. Zimmerman、John Montgomery
DOI:10.1021/acs.organomet.2c00279
日期:2022.11.28
catalysts of N-heterocycliccarbenes (NHCs) that are stabilized by electron-deficient alkenes possess desirable properties of air tolerance and ease of handling while also retaining high catalytic activities. Since catalyst stability often comes at the expense of catalytic activity, we have undertaken a detailed study of the activation mechanism of an IMes-nickel(0) catalyst stabilized by di(o-tolyl)
由缺电子烯烃稳定的N-杂环卡宾 (NHC) 的镍 (0) 催化剂具有良好的耐空气性和易于处理的特性,同时还保持高催化活性。由于催化剂稳定性往往以牺牲催化活性为代价,我们对二( o )稳定的IMes-镍(0)催化剂的活化机制进行了详细研究。-甲苯)富马酸酯,将稳定的前催化剂形式转化为催化活性物质。计算评估提供了反对简单的配体交换作为该催化剂的活化机制的证据,并且确定了共价修饰稳定配体的化学计量活化过程。开发了活化过程的详细计算图,并具有预测见解,阐明了当配体交换在热力学不利时运行的意想不到的催化剂活化途径。
Notes-Thermal Decarboxylation of Diaryl Fumarates to Stilbenes
作者:Sydney Spatz
DOI:10.1021/jo01068a638
日期:1961.10
Electrocatalytic Reduction of C–C π-Bonds via a Cobaltocene-Derived Concerted Proton–Electron Transfer Mediator: Fumarate Hydrogenation as a Model Study
作者:Joseph Derosa、Pablo Garrido-Barros、Jonas C. Peters
DOI:10.1021/jacs.1c03335
日期:2021.6.30
Reductive concertedproton–electrontransfer (CPET) is poorly developed for the reduction of C–C π-bonds, including for activated alkenes that can succumb to deleterious pathways (e.g., a competing hydrogen evolution reaction or oligomerization) in a standard electrochemical reduction. We demonstrate herein that selective hydrogenation of the C–C π-bond of fumarate esters can be achieved via electrocatalytic