作者:Siddique, Misba、Das, Mehali、Rit, Arnab
DOI:10.1021/acs.organomet.4c00184
日期:——
complexes were then explored as phosphine-free catalysts for the olefination of alcohols with sulfones, and among the complexes studied here, the benzimidazolylidene-supported 1b complex with acetylacetonate (acac) as a labile co-ligand was noted to be the most active one, which was also successful for a broad range of sulfones and alcohols providing diverse olefins. It is important to mention that this
合成了几种具有吡啶功能化 NHC 配体系统的空气稳定钴 (III) 配合物 1a-d 并进行了完全表征。然后,这些配合物被探索作为用于醇与砜烯化的无膦催化剂,并且在此研究的配合物中,以乙酰丙酮酸酯(acac)作为不稳定共配体的苯并咪唑亚基负载的1b配合物被认为是最活跃的配合物,这对于提供多种烯烃的各种砜和醇也取得了成功。值得一提的是,这是钴催化的此类协议的第一个例子。此外,通过克级反应和所得化合物的合成后修饰证明了本方案的实用性。最后,基于包括中间体检测和动力学研究在内的各种控制实验,提出了一种合理的机制。