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Palladium Nanoparticles on Graphite Oxide as Catalyst for SuzukiMiyaura , MizorokiHeck , and Sonogashira Reactions
Author(s) -
Rumi Luigi,
Scheuermann Gil M.,
Mülhaupt Rolf,
Bannwarth Willi
Publication year - 2011
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.201000412
Subject(s) - sonogashira coupling , chemistry , catalysis , aryl , ligand (biochemistry) , iodide , palladium , combinatorial chemistry , heck reaction , nanoparticle , graphite oxide , organic chemistry , oxide , chemical engineering , alkyl , biochemistry , receptor , engineering
Pd 2+ ‐Exchanged graphite oxide (GO) serves as a precatalyst for the formation of Pd‐nanoparticles which are then deposited on the highly functionalized carbonaceous support. This versatile, air‐stable, and ligand‐free system was applied successfully to SuzukiMiyaura couplings of some aryl chlorides and to the MizorokiHeck as well as the Sonogashira reaction showing relatively high activities and good selectivities. Like with other ligand‐free supported systems, the reaction proceeded dominantly by a homogeneous mechanism, but attack of an aryl iodide to Pd‐nanoparticles can be excluded as substantial contribution to the entire catalytic process. Beside its straightforward preparation and its stability in air, the system combines the advantages of both homogeneous and heterogeneous catalysis.