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.
Towards Long-Living Metathesis Catalysts by Tuning the N-Heterocyclic Carbene (NHC) Ligand on Trifluoroacetamide-Activated Boomerang Ru Complexes
作者:Hervé Clavier、Fréderic Caijo、Etienne Borré、Diane Rix、Fabien Boeda、Steven P. Nolan、Marc Mauduit
DOI:10.1002/ejoc.200900407
日期:2009.9
trifluoromethylamido-containing “boomerang” precatalysts bearing various N-heterocycliccarbene (NHC) ligands are reported. Comparative kinetic and stability studies show the significant effect of the NHC on the catalyst reaction profile. An investigation of the reaction scope for diverse metathesis transformations has allowed us to establish the influence of the NHC on catalyst activity, especially as a
Exchange of one PCy3 unit of the classical Grubbs catalyst 1 by N-heterocycliccarbene (NHC) ligands leads to "second-generation" metathesis catalysts of superior reactivity and increased stability. Several complexes of this type have been prepared and fully characterized, six of them by X-ray crystallography. These include the unique chelate complexes 13 and 14 in which the NHC- and the Ru-CR entities
Simple New Three-component Catalytic System for Enyne Metathesis
作者:Lutz Ackermann、Christian Bruneau、Pierre H. Dixneuf
DOI:10.1055/s-2001-11394
日期:——
A new active three-component catalytic system for enyne metathesis is reported. It is easily generated in situ by combination of [RuCl2(p-cymene)]2, 1,3-bis(mesityl)imidazolium chloride and Cs2CO3 and exhibits excellent performance for the intramolecular metathesis reaction even from highly substituted enynes.
Cls ruthenium complexes that can be used as catalysts are described. The complexes are generally square pyramidal in nature, having two anionic ligands X adjacent to each other. The complexes can be used as catalysts, for example in olefin metathesis reactions. Corresponding trans ruthenium complexes are also described, together with cationic complexes where one or both of the anionic ligands X are replaced by a non-co-ordinating anionic ligand.