Abstract

A series of potential metathesis catalyst based on Hoveyda-Grubbs ruthenium system with the N-heterocyclic carbene replaced by N-heterocyclic carbene boryl anion were investigated using the M06 density functional approach. We show that these hypothetical metathesis precatalysts have two stable conformations depending on the position of the benzylidene moiety with respect to the NHC part of the complex. Estimates of the free Gibbs energy of initiation for these systems predict that they can be one of the fastest initiating metathesis catalysts, on the level of 3rd generation Grubbs complexes.

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