期刊
COORDINATION CHEMISTRY REVIEWS
卷 394, 期 -, 页码 65-103出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.ccr.2019.05.003
关键词
N-Heterocyclic carbene (NHC); Chiral ligands; Polyfuncrional ligands; Transition metals; Asymmetric catalysis
Since their early development, N-heterocyclic carbene (NHC) ligands and their related metal complexes have attracted much attention, due to their high performances in many catalytic processes. Structural variations on the heterocycle allowed to fine tune their steric and electronic properties. Introduction of one (or more) additional donor group(s) on the N-side arm(s) opened the possibility to transform classical monodentate NHCs into bi- or tridentate ligands with different metal-donor affinities for binding. The additional donor may be a neutral donor, e.g. phosphine, (thio)ether, or anionic, e.g. alkoxide, offering a myriad of possibilities for the resulting polyfunctional NHC ligands. Another development of importance in the field of the NHC chemistry was the introduction of chirality, which can be either 1) central, located on an N-side arm and/or on the ligand backbone, 2) axial or 3) planar, opening the door to the application of NHC metal complexes to asymmetric catalysis. The present review summarizes the examples of chiral NHC ligands, functionalized by an additional donor group, which were successfully applied to metal-mediated asymmetric catalysis. When possible, the beneficial (or detrimental) effect of the NHC-functionalization will be discussed, along with the influence of the nature of the additional function, e.g. -OH vs. -OMe. (C) 2019 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据