Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5392459 | Computational and Theoretical Chemistry | 2017 | 7 Pages |
â¢The oxidative addition is a viable pathway for the activation of CF bond.â¢A simplified ligand model is used as an initial guide.â¢The possible intermediates are formed from interaction of the Ï-ring of PhF and low-coordinate Co(I) complexes.
A low-coordinate cobalt(I) complex, LtBuCo [LtBu = bulky β-diketiminate ligand] was reported to be capable of cleaving the CF bond in fluoroarenes. To investigate the mechanism of CF bond activation, a simplified ligand model (LMeCo) with methyl substituents was first used as a guide before the full LtBuCo complex was calculated. DFT calculations indicate the free energy change of CF oxidative addition is â3.9 kcal molâ1 to yield a Co(III) product. When the initial interaction of Co(I) complexes and the Ï-ring of PhF occurs, the free energy increases by 0.4 kcal molâ1. As a result, the formation of Ï-adducts is deemed to be an important mechanistic step, but is very sensitive to the steric influence of the supporting ligand substituents. The calculations indicate oxidative addition as a viable pathway for the activation of strong CF bonds by Earth-abundant 3d metals.
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