Silver N-heterocyclic carbene complexes as initiators for bulk ring-opening polymerization (ROP) of l-lactides
DSpace at IIT Bombay
View Archive InfoField | Value | |
Title |
Silver N-heterocyclic carbene complexes as initiators for bulk ring-opening polymerization (ROP) of l-lactides
|
|
Creator |
SAMANTARAY, MANOJA K
KATIYAR, VIMAL PANG, KELIANG NANAVATI, HEMANT GHOSH, PRASENJIT |
|
Subject |
complexation
crystal structure molecular weight silver compounds ring opening polymerization |
|
Description |
Synthetic, structural and catalysis studies of two silver complexes namely, {[1-(2,4,6-trimethylphenyl)-3-(N-phenylacetamido)imidazol-2-ylidene]2Ag}+Cl− 1b, supported over an amido-functionalized N-heterocyclic carbene ligand, and [1-(i-propyl)-3-(benzyl)imidazol-2-ylidene]AgCl 2b, supported over a non-functionalized N-heterocyclic carbene ligand, are reported. Specifically, 1b, a cationic complex bearing 2:1 NHC ligand to metal ratio, was obtained from the reaction of 1-(2,4,6-trimethylphenyl)-3-(N-phenylacetamido)imidazolium chloride 1a with Ag2O in 52% yield. The corresponding 1a was synthesized by the alkylation reaction of 1-(2,4,6-trimethylphenylimidazole) with N-phenyl chloroacetamide in 73% yield. The other silver complex 2b, a neutral complex bearing 1:1 NHC ligand to metal ratio, was obtained from the reaction of 1-(i-propyl)-3-(benzyl)imidazolium chloride 2a with Ag2O in 42% yield. The 2a was synthesized by the alkylation reaction of 1-(i-propylimidazole) with benzyl chloride in 45% yield. The molecular structures of the imidazolium chloride, 1a, and the silver complexes, 1b and 2b, have been determined by X-ray diffraction studies. The silver complexes, 1b and 2b, successfully catalyze bulk ring-opening polymerization (ROP) of l-lactides at elevated temperatures under solvent-free melt conditions producing moderate to low molecular weight polylactide polymers having narrow molecular weight distributions.
|
|
Publisher |
Elsevier
|
|
Date |
2009-03-09T07:40:24Z
2011-11-25T18:42:41Z 2011-12-26T13:06:51Z 2011-12-27T05:54:49Z 2009-03-09T07:40:24Z 2011-11-25T18:42:41Z 2011-12-26T13:06:51Z 2011-12-27T05:54:49Z 2007 |
|
Type |
Article
|
|
Identifier |
Journal of Organometallic Chemistry 692(8), 1672-1682
0022-328X http://dx.doi.org/10.1016/j.jorganchem.2006.12.022 http://hdl.handle.net/10054/888 http://dspace.library.iitb.ac.in/xmlui/handle/10054/888 |
|
Language |
en
|
|