Nitrogen-containing lanthanide complexes: initiators or real catalysts for the ε-caprolactone polymerisation?
Identifieur interne : 007D59 ( Main/Exploration ); précédent : 007D58; suivant : 007D60Nitrogen-containing lanthanide complexes: initiators or real catalysts for the ε-caprolactone polymerisation?
Auteurs : Marc Visseaux [France] ; Claire-Hélène Brachais [France] ; Christophe Boisson [France] ; Karine Tortosa [France]Source :
- Comptes Rendus de l'Academie des Sciences Series IIC Chemistry [ 1387-1609 ] ; 2000.
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Abstract
Nitrogen-based organolanthanide complexes: (Siam)3Ln (Ln=Yb, 1a, Sm, 1b), (C5H4CMe2)2Sm(Siam), 2, (COT)SmN(SiMe3)2, 4 (Siam=PhC(NSiMe3)2, COT=C8H8), are very efficient towards polymerisation of ε-caprolactone. Mechanistic studies on the basis of NMR experiments show that the complexes 1a, 1b and 2 behave as real catalysts, while 4 is the precursor of a heterogeneous initiator. The hapticity of the nitrogen ligand may be related to the formation of cyclic oligomers. © 2000 Académie des sciences/Éditions scientifiques et médicales Elsevier SASorganolanthanide / ε-caprolactone / polymerisation
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DOI: 10.1016/S1387-1609(00)00160-2
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<front><div type="abstract" xml:lang="en">Nitrogen-based organolanthanide complexes: (Siam)3Ln (Ln=Yb, 1a, Sm, 1b), (C5H4CMe2)2Sm(Siam), 2, (COT)SmN(SiMe3)2, 4 (Siam=PhC(NSiMe3)2, COT=C8H8), are very efficient towards polymerisation of ε-caprolactone. Mechanistic studies on the basis of NMR experiments show that the complexes 1a, 1b and 2 behave as real catalysts, while 4 is the precursor of a heterogeneous initiator. The hapticity of the nitrogen ligand may be related to the formation of cyclic oligomers. © 2000 Académie des sciences/Éditions scientifiques et médicales Elsevier SASorganolanthanide / ε-caprolactone / polymerisation</div>
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