tandem ring-closingmetathesis (RCM) double-bond isomerization reaction is described in this paper. The utility of this method for the efficient syntheses of five-, six-, and seven-membered cyclic enol ethers is demonstrated. It relies on the conversion of a metathesis-active rutheniumcarbene species to an isomerization-active ruthenium−hydride species in situ. This conversion is achieved by using various
本文描述了一种新型的钌催化串联闭环复分解(RCM)双键异构化反应。证明了该方法对五元,六元和七元环状烯醇醚的有效合成的效用。它依赖于易位活性钌卡宾物质到原位异构化活性钌氢化物物质的转化。通过使用各种添加剂可以实现这种转化。讨论了不同方案的范围和局限性,并基于31 P和1 H NMR光谱学研究提出了一些机械方面的考虑。
Ruthenium Catalysts Supported by Amino-Substituted N-Heterocyclic Carbene Ligands for Olefin Metathesis of Challenging Substrates
well‐known IMes ligand by substituting the carbenic heterocycle with one and two dimethylamino groups, respectively, were employed for the synthesis of second‐generation Grubbs‐ and Grubbs–Hoveyda‐type ruthenium metathesis precatalysts. Whereas the stability of the complexes was found to depend on the degree of dimethylamino‐substitution and on the type of complex, the backbone‐substitution was shown to
[EN] NOVEL RUTHENIUM COMPLEX, METHOD OF ITS PRODUCTION AND ITS USE IN REACTION OF OLEFINE METATHESIS<br/>[FR] NOUVEAU COMPLEXE DE RUTHÉNIUM, SON PROCÉDÉ DE PRODUCTION ET SON UTILISATION DANS LA RÉACTION DE MÉTATHÈSE D'OLÉFINES
申请人:UNIV WARSZAWSKI
公开号:WO2018100515A1
公开(公告)日:2018-06-07
The invention relates to novel ruthenium complexes of formula (9). The invention also relates to the method for preparation of novel metal complexes of formula (9) and their use in olefin metathesis reactions.
In a Quest for Selectivity Paired with Activity: A Ruthenium Olefin Metathesis Catalyst Bearing an Unsymmetrical Phenanthrene‐Based N‐Heterocyclic Carbene
ruthenium olefin metathesis pre‐catalyst, [3‐benzyl‐1‐(10‐phenyl‐9‐phenanthryl)]‐2‐imidazolidinylidene}dichloro(o‐isopropoxyphenylmethylene)ruthenium(II), Ru‐3, bearing an unsymetrical N‐heterocyclic carbene (uNHC) ligand, has been synthesized. The initiation rate of Ru‐3 was examined by ring‐closing metathesis and cross‐metathesis reactions with a broad spectrum of olefins, showing an unprecendented
A sustainable protocol of olefinmetathesis in non-degassed, undistilled ethyl acetate under air with commercially available self-scavenging ruthenium catalysts is described. Furthermore, a time economical, cost-effective and scalable method of removal of ruthenium residues is presented. Treatment of post-reaction mixtures with an isocyanidescavenger and then with acid followed by a simple filtration