Please use this identifier to cite or link to this item:
|Title:||Bimetallic gold-palladium alloy nanoclusters: An effective catalyst for Ullmann coupling of chloropyridines under ambient conditions|
|Authors:||Raghu Nath Dhital|
National Institutes of Natural Sciences - Institute for Molecular Science
Japan Science and Technology Agency
|Citation:||Catalysis Science and Technology. Vol.3, No.11 (2013), 3030-3035|
|Abstract:||An efficient method for the Ullmann coupling of chloropyridines catalyzed by poly(N-vinylpyrrolidone) (PVP)-stabilized bimetallic Au-Pd alloy nanoclusters (NCs) under ambient conditions is demonstrated. The reaction does not occur with either gold or palladium single-metal clusters alone, nor with a physical mixture of the two metals. The experimental results indicate that the inclusion of Au as a nearest heteroatom is crucial to initiate the coupling and its composition up to 50% is essential to accelerate the reaction. Unlike the conventional transition metal catalysis, 2-chloropyridine was found to be highly reactive as compared to 2-bromopyridine. From the UV-vis and ICP-AES measurements, a significant amount of leached Pd(ii) was observed in the coupling with 2-bromopyridine as compared with 2-chloropyridine, indicating that the leaching process might be a crucial factor in diminishing the reactivity. © 2013 The Royal Society of Chemistry.|
|Appears in Collections:||Scopus 2011-2015|
Files in This Item:
There are no files associated with this item.
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.