Reference : Synthesis of N-heterocyclic carbene precursors bearing biphenyl units and their use in r...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Chemistry
http://hdl.handle.net/2268/15394
Synthesis of N-heterocyclic carbene precursors bearing biphenyl units and their use in ruthenium-catalyzed ring-opening metathesis polymerization
English
Maj, Anna M. [> > > >]
Delaude, Lionel mailto [Université de Liège - ULg > > Chimie macromoléculaire et catalyse organique >]
Demonceau, Albert mailto [Université de Liège - ULg > > Chimie macromoléculaire et catalyse organique >]
Noels, Alfred mailto [Université de Liège - ULg > Services généraux (Faculté des sciences) > Relations académiques et scientifiques (Sciences) >]
2007
Journal of Organometallic Chemistry
Elsevier Science
692
14
3048-3056
Yes (verified by ORBi)
International
0022-328X
Lausanne
Switzerland
[en] arene ligands ; biaryls ; carbene ligands ; cyclooctene ; homogeneous catalysis ; substituent effects
[en] A range of new imidazolium and imidazolinium chlorides bearing biphenyl units on their nitrogen atoms was synthesized. They differed by the electron-withdrawing or -donating nature and the steric bulk of the substituents on their aromatic rings. These various N-heterocyclic carbene (NHC) precursors were combined with the [RuCl2(p-cymene)](2) dimer and potassium tert-butoxide to generate the corresponding ruthenium-arene complexes [RuCl2(p-cymene)(NHC)] in situ. The catalytic activity of these species was investigated in the photoinduced ring-opening metathesis polymerization (ROMP) of cyclooctene. The results obtained confirmed the necessity of blocking the ortho-positions of the phenyl rings in the vicinity of the metal center in order to attain high catalytic efficiencies. They also showed that changing the steric and electronic properties of the substituents on the remote phenyl rings of the biphenyl units had no significant influence on the outcome of the polymerization. (C) 2007 Elsevier B.V. All rights reserved.
http://hdl.handle.net/2268/15394
10.1016/j.jorganchem.2007.03.027

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