Reference : New ruthenium catalysts bearing N-heterocyclic carbene ligands for ATRP

	Document type :	Scientific congresses and symposiums : Poster
	Discipline(s) :	Physical, chemical, mathematical & earth Sciences : Chemistry
	To cite this reference:	http://hdl.handle.net/2268/61096

Title :	New ruthenium catalysts bearing N-heterocyclic carbene ligands for ATRP
Language :	English
Author, co-author :	Sauvage, Xavier [Université de Liège - ULg > > Centre de recherches du cyclotron >]
	Richel, Aurore [Université de Liège - ULg > Chimie et bio-industries > Chimie biologique industrielle >]
	Delfosse, Sébastien [ > > ]
	Delaude, Lionel [Université de Liège - ULg > Département de chimie (sciences) > Chimie macromoléculaire et catalyse organique >]
	Demonceau, Albert [Université de Liège - ULg > Département de chimie (sciences) > Chimie macromoléculaire et catalyse organique >]
	Noels, Alfred [Université de Liège - ULg > Services généraux (Faculté des sciences) > Relations académiques et scientifiques (Sciences) >]
Publication date :	May-2003
Page number :	A0
Event name :	Recent Progress in Macromolecular Chemistry
Event date :	16 mai 2003
Event organizer :	CERM (Centre d'Etude et de Recherche sur les Macromolecules) , Université de Liège
Event place (city) :	Liege
Event country :	Belgique
Abstract :	[en] Stable nucleophilic N-heterocyclic carbenes (NHCs) are neutral, two-electron ligands with a negligible p-back-bonding tendency. They behave as phosphine mimics, yet they are better s- donors and they form stronger bonds to metal centers than most phosphines. Their electronic and steric properties are liable to ample modification simply by varying the substituents on the nitrogen atoms. Therefore, NHCs constitute a promising new class of ligands available for catalyst engineering and fine-tuning. We found that the 18-electron complex RuCl2(p-cymene)(PCy3) was a versatile and efficient promoter for ring-opening metathesis polymerization of both strained and low-strain cyclic olefins when activated by a suitable precursor such as trimethylsilyldiazomethane. This complex was also an excellent catalyst for ATRP (Atom Transfer Radical Polymerization) of MMA and styrene. In this poster, we present preliminary results obtained in olefin metathesis and in radical reactions (ATRP and Kharasch addition) when tricyclohexylphosphine was substituted by an N-heterocylic carbene ligand.
Permalink :	http://hdl.handle.net/2268/61096

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	Fulltext file(s): File Commentary Version Size Access Restricted access sauvage12_301003.pdf Publisher postprint 93.63 kB Request copy Restricted access Sauvage Richel Abstract.pdf Publisher postprint 564.04 kB Request copy

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