η5-Oxocyclohexadienyl ligands in transition metal chemistry: Neglected (Brønsted) base ligands in cooperative catalysis
Résumé
This contribution gives an exhaustive view on the coordination chemistry of the largely neglected internal π-bonded (Brønsted) base η5-oxocyclohexadienyl arene type ligands. Synthesis of eta5-oxocyclohexadienyl transition metal complexes are easily achieved via a broad range of chemical pathways. Experimental analytical data recorded in the liquid and solid phase allowed to assign the η5-geometry of the oxocyclohexadienyl ligand. From recent pioneering results, it is reasonable to anticipate that eta5-oxocyclohexadienyl transition metal complexes, “bifunctional Shvo-type species catalysts”, are promising catalysts and deserve further experimental and computational studies with respect to structure/activity relationships. These species have a long way to go in coordination chemistry extending their domain of applications.