Fine-tuning dirhodium compounds with bridging ligands: Synthesis, structure, catalytic efficiency
作者:Yangbo Ning、Jiantao Tan、Zhifan Wang、Yuanhua Wang
DOI:10.1016/j.jorganchem.2021.122078
日期:2021.12
out a study on the effect of fine-tuning of the bridging ligand on the dirhodium compound. Several dirhodium compounds were designed and synthesized. During this process, we have successfully found Rh2(5-Br-esp)2 and Rh2(5-tBu-esp)2, which are closer to the ideal geometric configuration of the dirhodium(II) compounds. Rh2(5-Br-esp)2 has been applied in the oxidation of propargyl position and Rh2(5-tBu-esp)2
铑化合物的结构包含一个独特的Rh-Rh键、两个轴向配体和四个桥连配体。在二铑(II)化合物中,在催化过程中桥接配体的配位原子很容易发生迁移,从而导致催化剂的降解。在桥连配体中发现了配位原子迁移。为了提高催化剂的稳定性,我们对桥接配体的微调对二铑化合物的影响进行了研究。设计并合成了几种铑化合物。在这个过程中,我们成功地发现了Rh 2 (5-Br-esp) 2和Rh 2 (5 - t Bu-esp) 2,这更接近于 dirhodium(II) 化合物的理想几何构型。Rh 2 (5-Br-esp) 2已应用于炔丙基位置的氧化,Rh 2 (5 - t Bu-esp) 2已应用于C-N键的形成反应。