Interpreting Oxidative Addition of Ph-X (X = CH3, F, Cl, and Br) to Monoligated Pd(0) Catalysts Using Molecular Electrostatic Potential.
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ABSTRACT: A B3LYP density functional theory study on the oxidative addition of halogenobenzenes and toluene to monoligated zerovalent palladium catalysts (Pd-L) has been carried out using the "L" ligands such as phosphines, N-heterocyclic carbenes, alkynes, and alkenes. The electron deficiency of the undercoordinated Pd in Pd-L is quantified in terms of the molecular electrostatic potential at the metal center (V Pd), which showed significant variation with respect to the nature of the L ligand. Further, a strong linear correlation between ΔV Pd and the activation barrier (E act) of the reaction is established. The correlation plots between ΔV Pd and E act suggest that a priori prediction on the ability of the palladium complex to undergo oxidative addition is possible from V Pd analysis. In general, as the electron-donating nature of ligand increases, the suitability of Pd(0) catalyst to undergo oxidative addition increases. V Pd measures the electron-rich/-deficient nature of the metal center and provides a quantitative measure of the reactivity of the catalyst. By tuning the V Pd value, efficient catalysts can be designed.
SUBMITTER: Anjali BA
PROVIDER: S-EPMC6641867 | biostudies-literature | 2017 Aug
REPOSITORIES: biostudies-literature
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