Group 3 metal complexes based on a chiral tetradentate diamine-diamide ligand:: Synthesis and use in polymerization of (D,L)-lactide and intramolecular alkene hydroamination catalysis

被引：59

作者：

Heck, Romain

Schulz, Emmanuelle

Collin, Jacqueline

Carpentier, Jean-Francois ^{[1
]}

机构：

[1] Univ Rennes 1, CNRS, UMR 6226, F-35042 Rennes, France

[2] Univ Paris 11, CNRS, Lab Catalyse Mol, UMR 8182,ICMMO, F-91405 Orsay, France

来源：

JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL | 2007年 / 268卷 / 1-2期

关键词：

homogeneous catalysis; hydroamination; lanthanides; N ligands; polymerization;

D O I：

10.1016/j.molcata.2006.12.030

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

New amido complexes [Me2PMEN]Ln(N(SiR3)(2)) (Ln=Y, SiR3 =SiMe3, 2; Ln=Nd, SiR3 =SiMe3, 3; Ln=La, SiR3 =SiHMe2, 4) based on the chiral tetradentate diamine-diamide ligand [Me2PMEN](2-), derived by double deprotonation of the parent tetraamine N,N'-dimethyl-N,N'-bis[(S)2-methylpyrrolidine]ethylenediamine ([Me2PMEN]H-2, 1), have been readily prepared by amine elimination protocols. Complex 2 was shown to be active for the ring-opening polymerization of racemic-lactide at room temperature in toluene to yield isotactic-enriched polylactides (P-m up to 70%) with relatively narrow polydispersities (M-w/M-n = 1.32-1.67), but poor initiation efficiency. Complex 2 is also highly active for the room temperature hydroamination/cyclization of some aminopentene and aminohexene derivatives, though those reactions proceed with low enantioselectivities (up to 11% ee). (c) 2007 Elsevier B.V. All rights reserved.

引用

页码：163 / 168

页数：6

共 53 条

[1] Bis[bis(oxazolinato)] complexes of yttrium and lanthanum:: Molecular structure and use in polymerization of DL-lactide and DL-β-butyrolactone [J].