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Oxidative addition of 2-substituted azolium salts to Group-10 metal zero complexes-A DFT study


Graham, DC and Cavell, KJ and Yates, BF, Oxidative addition of 2-substituted azolium salts to Group-10 metal zero complexes-A DFT study, Dalton Transactions, 2007, (41) pp. 4650-4658. ISSN 1477-9226 (2007) [Refereed Article]

DOI: doi:10.1039/b709914b


Generation of N-heterocyclic carbene (NHC) complexes [(dmpe)M(azol-2- ylidene)R] via the oxidative addition of a series of 2-substituted azolium salts to Group-10 zerovalent metal complexes has been investigated using density functional theory (2-R = H, Me, Ph; Azole = imidazole, thiazole, oxazole; M = Ni, Pd, Pt). Overall, platinum-based pathways result in the greatest enthalpies of reaction, but due to the reactive nature of Group-10 metals bearing the 1,2-bis(dimethylphosphino)ethane (dmpe) chelate, nickel and palladium species also have little trouble proceeding to stable products in the absence of a significant barrier. Imidazolium salts were found to be the most vulnerable to oxidative addition due to their low stabilisation energies when compared to the oxazolium and thiazolium species. Activation barriers show the general trend of phenyl > methyl > hydrido with regard to the azole 2-substituent, with no observed barrier for all but one of the 2-hydrido cases. Minimal barriers were found to exist in a number of cases for activation of a C(2)-CH3 bond suggesting that synthesis of alkyl-carbene complexes may be possible via this route under certain conditions, and therefore ionic liquids based on these substituted azolium salts may be active participants in catalytic reactions. © The Royal Society of Chemistry 2007.

Item Details

Item Type:Refereed Article
Research Division:Chemical Sciences
Research Group:Inorganic chemistry
Research Field:Organometallic chemistry
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the chemical sciences
UTAS Author:Graham, DC (Dr David Graham)
UTAS Author:Cavell, KJ (Professor Kingsley Cavell)
UTAS Author:Yates, BF (Professor Brian Yates)
ID Code:51070
Year Published:2007
Web of Science® Times Cited:37
Deposited By:Chemistry
Deposited On:2007-08-01
Last Modified:2012-03-05

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