Ruthenium Olefin Metathesis Catalysts Containing Fluoride

The reaction of the ruthenium complex cis-Caz-1 with silver fluoride affords the
first example of an
active olefin metathesis precatalyst containing fluoride ligands.
The cis geometry of the precursor complex is key to the successful
fluoride exchange reaction. Computational studies highlight the stability
of the new Ru–F species, due to push–pull interactions
between fluoride and L-type ligands (L: N-heterocyclic
carbene, phosphite). Insights into the isomerization process from trans-Caz-1 to cis-Caz-1 are given. Fluoride exchange reactions were performed involving cis- and trans-Caz-1 complexes.
Catalytic tests showcase the excellent activity of the Ru–F
containing complexes.