Dalton Transactions p. 17617 - 17628 (2015)
Update date:2022-08-30
Topics:
Modak, Sudipta
Gangwar, Manoj Kumar
Nageswar Rao, Mitta
Madasu, Mahesh
Kalita, Alok Ch.
Dorcet, Vincent
Shejale, Mayuri Arun
Butcher, Ray J.
Ghosh, Prasenjit
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.
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