Steric Maps to Evaluate the Role of Steric Hindrance on the IPr NHC Ligand
Urbina-Blanco, César A.
Nolan, Steven P.
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AbstractDensity functional theory (DFT) calculations were used to predict and rationalize the effect of the modification of the structure of the prototype 1,3-bis(2,6-diisopropylphenyl)imidazol-2-ylidene) (IPr) N-heterocyclic carbene (NHC) ligand. The modification consists in the substitution of the methyl groups of ortho isopropyl substituent with phenyl groups, and here we plan to describe how such significant changes effect the metal environment and therefore the related catalytic behaviour by simple steric maps. Bearing in mind that there is a significant structural difference between IPr and IPr* ligands, that translated in different reactivity for several olefin metathesis reactions, here by means of DFT we characterize where the NHC ligand plays a more active role and where it is a simple spectator, or at least its modification does not significantly change its catalytic role/performance. Furthermore, this communication endeavours to modify further the skeleton of the IPr NHC ligand. The optimization of these bulky new systems go to the limits of the DFT computational method.
CitationSteric Maps to Evaluate the Role of Steric Hindrance on the IPr NHC Ligand 2013, 18:845 Procedia Computer Science
JournalProcedia Computer Science
Conference/Event name13th Annual International Conference on Computational Science, ICCS 2013