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Fluoride-free Hiyama coupling by palladium abnormal N-heterocyclic carbene complexes

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Title Fluoride-free Hiyama coupling by palladium abnormal N-heterocyclic carbene complexes
 
Creator MODAK, S
GANGWAR, MK
RAO, MN
MADASU, M
KALITA, AC
DORCET, V
SHEJALE, MA
BUTCHER, RJ
GHOSH, P
 
Subject CHARGE DECOMPOSITION ANALYSIS
SET MODEL CHEMISTRY
VALENT FISCHER-TYPE
TRANSITION-METAL
NHC LIGANDS
ORGANOMETALLIC COMPOUNDS
CATALYTIC-ACTIVITIES
TOTAL ENERGIES
PD
MECHANISM
 
Description A series of palladium complexes of the abnormal N-heterocyclic carbene ligands of the type (a-NHC)-PdI2(L) [L = NC5H5 (1-3)b and PPh3 (1-3)c] effectively catalyzed the Hiyama coupling of aryl bromides and iodides with PhSi(OMe)(3) under the highly desired fluoride-free conditions. Interestingly enough, the pyridine based trans-(1-3)b complexes and a PPh3 derived cis-3c complex exhibited higher yields than the related PPh3 derived trans-(1-2)c complexes. The superior performances of the pyridine based trans-(1-3)b complexes and the PPh3 derived cis-3c complex have been correlated to a tighter binding of the a-NHC ligand to the palladium center in these complexes, leading to a greater (a-NHC) ligand influence on the metal center partaking in the catalysis.
 
Publisher ROYAL SOC CHEMISTRY
 
Date 2016-01-15T07:09:53Z
2016-01-15T07:09:53Z
2015
 
Type Article
 
Identifier DALTON TRANSACTIONS, 44(40)17617-17628
1477-9226
1477-9234
http://dx.doi.org/10.1039/c5dt02317c
http://dspace.library.iitb.ac.in/jspui/handle/100/18014
 
Language en