ORBi: Wang Jin-Shan - Anionic polymerization of acrylic monomers. 18. NMR characterization of a unique complex between lithium 2-(2-methoxyethoxy) ethoxide and methyl α-lithioisobutyrate

Reference : Anionic polymerization of acrylic monomers. 18. NMR characterization of a unique complex...


	Document type :	Scientific journals : Article
	Discipline(s) :	Physical, chemical, mathematical & earth Sciences : Chemistry Engineering, computing & technology : Materials science & engineering
	To cite this reference:	http://hdl.handle.net/2268/16275

Title :	Anionic polymerization of acrylic monomers. 18. NMR characterization of a unique complex between lithium 2-(2-methoxyethoxy) ethoxide and methyl α-lithioisobutyrate
Language :	English
Author, co-author :	Wang, Jin-Shan [University of Liège (ULg) > Department of Chemistry > Center for Education and Research on Macromolecules (CERM) > >]
	Jérôme, Robert [University of Liège (ULg) > Department of Chemistry > Center for Education and Research on Macromolecules (CERM) > >]
	Teyssié, Philippe [University of Liège (ULg) > Department of Chemistry > Center for Education and Research on Macromolecules (CERM) > >]
Publication date :	29-Aug-1994
Journal title :	Macromolecules
Publisher :	American Chemical Society
Volume :	27
Issue/season :	18
Pages :	4896-4901
Audience :	International
ISSN :	0024-9297
City :	Washington
Country :	DC
Keywords :	[en] anionic polymerization ; (meth)acrylate
Abstract :	[en] A unique ligand-promoted-loose mixed complex MIB-(Li-3(OEEM)(2))(+) has been characterized for the first time by means of NMR spectroscopy in solution. This new complex, which is a dual mu/sigma one, is obviously different from either a simple tight mu-mixed complex, such as nMIBLi.mX (X = Cl or OtBu), or a sigma-cation-binding one with mole charge separation, such as K211/MIBLi. It originates from a simultaneous dual complexation (mu/sigma) of MIBLi by both the lithium alkoxide (mu-mixed complexation) and the chelating polyether components (sigma-cation-binding complexation) of LiOEEM. Furthermore, it has been demonstrated; that, whichever the solvent, i.e., toluene, a 9/1 toluene/THF mixture, or THF, complexation of MIBLi by greater than or equal to 2 mol equiv of LiOEEM produces the same type of complex, i.e., MIB-(Li-3(OEEM)(2))(+), suggesting that, in this strong complex, the lithium cations are strongly coordinated by the ligand.
Research units :	Center for Education and Research on Macromolecules (CERM)
Funders :	Elf-Atochem ; Politique Scientifique Fédérale (Belgique) = Belgian Federal Science Policy
Target :	Researchers
Permalink :	http://hdl.handle.net/2268/16275
DOI :	10.1021/ma00096a008
Other URL :	http://pubs.acs.org/doi/pdf/10.1021/ma00096a008

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