well‐known IMes ligand by substituting the carbenic heterocycle with one and two dimethylamino groups, respectively, were employed for the synthesis of second‐generation Grubbs‐ and Grubbs–Hoveyda‐type ruthenium metathesis precatalysts. Whereas the stability of the complexes was found to depend on the degree of dimethylamino‐substitution and on the type of complex, the backbone‐substitution was shown to
N-杂环卡宾(NHC)
配体IMes和IMes通过分别用一个和两个二甲基
氨基取代羧基杂环而从著名的IMes
配体衍生而来,用于合成第二代Grubbs和Grubbs-Hoveyda型
钌复分解前催化剂。尽管发现复合物的稳定性取决于二甲基
氨基取代的程度和复合物的类型,但骨架取代显示出对它们在闭环复分解反应中的催化活性有积极影响,其作用更为明显。在第二代Grubbs型系列中。新的配合物已成功用于许多具有挑战性的烯烃复分解反应中,导致形成四取代的C = C双键和/或官能化的化合物。