Bis(8-quinolinolato)aluminum ethyl complexes: Iso-Selective Initiators for rac-Lactide Polymerization

被引：90

作者：

Bakewell, Clare ^{[2
]}

Platel, Rachel H. ^{[2
]}

Cary, Samantha K. ^{[1
]}

Hubbard, Steven M. ^{[1
]}

Roaf, Joshua M. ^{[1
]}

Levine, Alex C. ^{[1
]}

White, Andrew J. P. ^{[2
]}

Long, Nicholas J. ^{[2
]}

Haaf, Michael ^{[1
]}

Williams, Charlotte K. ^{[2
]}

机构：

[1] Ithaca Coll, Ctr Nat Sci, Ithaca, NY 14850 USA

[2] Univ London Imperial Coll Sci Technol & Med, Dept Chem, London SW7 2AZ, England

来源：

ORGANOMETALLICS | 2012年 / 31卷 / 13期

基金：

英国工程与自然科学研究理事会;

关键词：

RING-OPENING POLYMERIZATION; GROUP-4 SALALEN COMPLEXES; STEREOSELECTIVE POLYMERIZATION; ALUMINUM COMPLEXES; YTTRIUM COMPLEXES; RACEMIC LACTIDE; EPSILON-CAPROLACTONE; ALKYL COMPLEXES; FLUXIONAL BEHAVIOR; OPTICAL-PROPERTIES;

D O I：

10.1021/om300307t

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The synthesis and characterization of a series of bis(8-quinolinato)aluminum ethyl complexes, substituted at the 2-, 5-, and 7-positions on the 8-quinolinol ligand, are presented. These complexes are viable initiators for the ring-opening polymerization of rac-lactide in the presence of 1 equiv of isopropyl alcohol. The polymerization control is good, it shows a linear evolution of molecular weight as the polymerization progresses, the polylactide molecular weights are in close agreement with those determined on the basis of the reaction stoichiometry, and the polydispersity indices are narrow. The polymerization kinetics have been monitored, and the influence of the site of ligand substitution has been related to the rates. Some of the initiators show stereocontrol, producing PLA with a good probability of isotactic enchainment (P-i = 0.76).

引用

页码：4729 / 4736

页数：8

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