Ruthenium Olefin Metathesis Catalysts with N-Heterocyclic Carbene Ligands Bearing <i>N</i>-Naphthyl Side Chains
作者:Ludovic Vieille-Petit、Hervé Clavier、Anthony Linden、Sascha Blumentritt、Steven P. Nolan、Reto Dorta
DOI:10.1021/om9009697
日期:2010.2.22
second-generation ruthenium-based olefinmetathesis catalysts bearing N-naphthyl-substituted N-heterocyclic carbene (NHC) ligands have been prepared and fully characterized. By reaction with the appropriate NHC, these complexes are readily accessible in one synthesis step from the commercially available first-generation precursors [RuCl2(═CHPh)(PCy3)2] (Grubbs I, GI) or [RuCl2(═CH-o-iPrO-Ph)(PCy3)] (Hoveyda−Grubbs
The Influence of Phosphane Ligands on the Versatility of Ruthenium-Indenylidene Complexes in Metathesis
作者:Julie Broggi、César A. Urbina-Blanco、Hervé Clavier、Anita Leitgeb、Christian Slugovc、Alexandra M. Z. Slawin、Steven P. Nolan
DOI:10.1002/chem.201000659
日期:——
study dealing with the effect of phosphane fine‐tuning in ruthenium–indenylidene catalysts was performed. Challenged to establish how the electronic properties of para‐substituted phosphane ligands translate into catalyst activity, the versatile behaviour of these new ruthenium–indenylidenecomplexes was investigated for a number of metathesis reactions.
inexpensive, nontoxic manganese catalyst enabled unprecedented redox‐neutral carbonylative annulations under ambient pressure. The manganese catalyst outperformed all other typically used base and precious‐metal catalysts. The outstanding versatility of the manganese catalysis manifold was reflected by ample substrate scope, setting the stage for effective late‐stage manipulations under racemization‐free
申请人:UNIVERSITY COURT OF THE UNIVERSITY OF ST ANDREWS
公开号:US20140228563A1
公开(公告)日:2014-08-14
Cis and trans ruthenium complexes that can be used as catalysts for ring opening metathesis polymerisation (ROMP) are described. The complexes are generally square pyramidal in nature, having two anionic ligands X. Corresponding cationic complexes where one or both of the anionic ligands X are replaced by a non-co-ordinating anionic ligand are also described. Polymers such as polydicyclopentadiene (PDCPD) can be prepared using the catalysts.
was designed and anchored onto sulfonated silica, thereby forming a robust and highly active supported olefin‐metathesis pre‐catalyst for applications under batch and continuous‐flow conditions. The involvement of an oxazine–benzylidene ligand allowed the reactivity of the formed Ru pre‐catalyst to be efficiently controlled through both steric and electronic activation. The oxazine scaffold facilitated