Synthesis and characterization of novel PEPPSI type bicyclic (alkyl)(amino)carbene (BICAAC)-Pd complexes
作者:Márton Nagyházi、Balázs Almási、Ádám Lukács、Attila Bényei、Tibor Nagy、Sándor Kéki、Róbert Tuba
DOI:10.1016/j.molstruc.2022.132483
日期:2022.5
containing palladium Pd(II) complexes (6a–e) were synthetized and characterized. As novel examples of the PEPPSI (“pyridine enhanced precatalyst preparation stabilization and initiation”)-Pd compounds, the reported complexes have shown high activity in Mizoroki–Heck coupling reaction even at as low as 100 ppm loading (TON up to 10000). Kinetic studies revealed that reactions carried out in the presence
一系列双环烷基氨基卡宾 (BICAAC)(其中N-芳基 = dipp, mes, 2,6-dimethyl-4-(dimethylamino)phenyl, 5a-d)及其新型耐空气和防潮吡啶(吡啶,4合成并表征了含有钯 Pd(II) 配合物 ( 6a-e ) 的二甲氨基吡啶。作为 PEPPSI 的新实例(“吡啶增强的预催化剂制备稳定和引发”)-Pd 化合物,所报道的配合物在 Mizoroki-Heck 偶联反应中显示出高活性,即使在低至 100 ppm 的负载量(TON 高达 10000)。动力学研究表明,在元素汞存在下进行的反应会导致活性降低。这表明偶联反应可能同时具有分子和 Pd(0) 介导的催化途径。