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Gold(I) N-heterocyclic carbene based initiators for bulk ring-opening polymerization of l-lactide

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Title Gold(I) N-heterocyclic carbene based initiators for bulk ring-opening polymerization of l-lactide
 
Creator RAY, LIPIKA
KATIYAR, VIMAL
BARMAN, SAMIR
RAIHAN, MUSTAFA J
NANAVATI, HEMANT
SHAIKH, MOBIN M
GHOSH, PRASENJIT
 
Subject gold compounds
molecular weight
synthesis (chemical)
complexation
ring opening polymerization
 
Description Synthesis, structures, and catalysis studies of gold(I) complexes of N-heterocyclic carbenes namely, a di-O-functionalized [1-(2-hydroxy-cyclohexyl)-3-(acetophenone)imidazol-2-ylidene], a mono-O-functionalized [1-(2-hydroxy-cyclohexyl)-3-(benzyl)imidazol-2-ylidene] and a non-functionalized [1,3-di-i-propyl-benzimidazol-2-ylidene], are reported. Specifically, the gold complexes, [1-(2-hydroxy-cyclohexyl)-3-(acetophenone)imidazol-2-ylidene]AuCl (1c), [1-(2-hydroxy-cyclohexyl)-3-(benzyl)imidazol-2-ylidene]AuCl (2c), and [1,3-di-i-propyl-benzimidazol-2-ylidene]AuCl (3b), were prepared from the respective silver complexes 1b, 2b, and 3a by treatment with (SMe2)AuCl in good yields following the commonly used silver carbene transfer route. The silver complexes 1b, 2b, and 3a were synthesized from the respective imidazolium halide salts by the reactions with Ag2O. The N-heterocyclic carbene precursors, 1-(2-hydroxy-cyclohexyl)-3-(acetophenone)imidazolium chloride (1a) and 1-(2-hydroxy-cyclohexyl)-3-(benzyl)imidazolium chloride (2a), were synthesized by the direct reactions of cyclohexene oxide and imidazole with chloroacetophenone and benzyl chloride respectively. The gold (1c, 2c, and 3b) and the silver (3a) complexes along with a new O-functionalized imidazolium chloride salt (1a) have been structurally characterized by X-ray diffraction. The structural studies revealed that geometries around the metal centers were almost linear in these gold and silver complexes. The gold (1c, 2c, and 3b) complexes efficiently catalyze ring-opening polymerization (ROP) of l-lactide under solvent-free melt conditions producing polylactide polymer of moderate to low molecular weights with narrow molecular weight distributions.
 
Publisher Elsevier
 
Date 2009-03-09T07:40:51Z
2011-11-25T18:43:41Z
2011-12-26T13:07:00Z
2011-12-27T05:54:59Z
2009-03-09T07:40:51Z
2011-11-25T18:43:41Z
2011-12-26T13:07:00Z
2011-12-27T05:54:59Z
2007
 
Type Article
 
Identifier Journal of Organometallic Chemistry 692(20), 4259-4269
0022-328X
http://dx.doi.org/10.1016/j.jorganchem.2007.06.033
http://hdl.handle.net/10054/890
http://dspace.library.iitb.ac.in/xmlui/handle/10054/890
 
Language en