Well-defined NHC-rhodium hydroxide complexes as alkenehydrosilylation and dehydrogenative silylation catalysts
作者:Byron J. Truscott、Alexandra M. Z. Slawin、Steven P. Nolan
DOI:10.1039/c2dt31339a
日期:——
Alkene hydrosilylation and dehydrogenative silylation reactions, mediated by [Rh(cod)(NHC)(OH)] complexes (cod = 1,5-cyclooctadiene; NHC = N-heterocyclic carbene) are described. The study details a comparison of the catalytic activity and steric characteristics of four rhodium complexes bearing different NHC ligands. The novel [Rh(cod)(Ii-PrMe)(OH)] complex (Ii-PrMe = 1,3-diisopropyl-4,5-dimethylimidazol-2-ylidine) was designed to improve the reactivity of Rh(I)-hydroxides and proved to be a successful promoter of hydrosilylation and dehydrogenative silylation, displaying good stereo- and regiocontrol.
烯烃氢硅烷化和脱氢硅烷化反应,通过[Rh(cod)(NHC)(OH)]配合物(cod = 1,5-环辛二烯;NHC = N-杂环卡宾)介导进行。研究详细比较了四种含不同NHC配体的铑配合物的催化活性和空间特性。新型[Rh(cod)(Ii-PrMe)(OH)]配合物(Ii-PrMe = 1,3-二异丙基-4,5-二甲基咪唑-2-亚基)旨在提高Rh(I)-氢氧化物的反应活性,并证明是氢硅烷化和脱氢硅烷化的有效促进剂,显示出良好的立体和区域控制性能。