Altmetric

Metal-Size Influence in Iso-Selective Lactide Polymerization

File Description SizeFormat 
Metal-size influence in iso-selective lactide polymerization.pdfPublished version512.77 kBAdobe PDFView/Open
Title: Metal-Size Influence in Iso-Selective Lactide Polymerization
Authors: Bakewell, C
White, AJP
Long, NJ
Williams, CK
Item Type: Journal Article
Abstract: Iso-selective initiators for the ring-opening polymerization (ROP) of rac-lactide are rare outside of Group 13. We describe the first examples of highly iso-selective lutetium initiators. The phosphasalen lutetium ethoxide complex shows excellent iso-selectivity, with a Pi value of 0.81–0.84 at 298 K, excellent rates, and high degrees of polymerization control. Conversely, the corresponding La derivative exhibits moderate heteroselectivity (Ps=0.74, 298 K). Thus, the choice of metal center is shown to be crucial in determining the level and mode of stereocontrol. The relative order of rates for the series of complexes is inversely related to metallic covalent radius: that is, La>Y>Lu.
Issue Date: 7-Jul-2014
Date of Acceptance: 7-Jul-2014
URI: http://hdl.handle.net/10044/1/40656
DOI: http://dx.doi.org/10.1002/anie.201403643
ISSN: 1521-3773
Publisher: Wiley
Start Page: 9226
End Page: 9230
Journal / Book Title: Angewandte Chemie-International Edition
Volume: 53
Issue: 35
Copyright Statement: © 2014 The Authors. Published by Wiley-VCH Verlag GmbH & Co. KGaA. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
Engineering & Physical Science Research Council (EPSRC)
Engineering & Physical Science Research Council (EPSRC)
Funder's Grant Number: EP/C544846/1
EP/K035274/1
n/a
Keywords: Science & Technology
Physical Sciences
Chemistry, Multidisciplinary
Chemistry
iso-selectivity
lactide
lanthanum
lutetium
ring-opening polymerization
RING-OPENING POLYMERIZATION
YTTRIUM PHOSPHASALEN INITIATORS
RAC-LACTIDE
RACEMIC LACTIDE
CYCLIC ESTERS
ALUMINUM COMPLEXES
INDIUM CATALYST
STEREOSELECTIVE POLYMERIZATION
STEREOCOMPLEX FORMATION
BIS(PHENOLATO) LIGANDS
Organic Chemistry
03 Chemical Sciences
Publication Status: Published
Appears in Collections:Chemistry
Catalysis and Advanced Materials
Faculty of Natural Sciences



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

Creative Commonsx