Taming early transition metals: the use of polydentate amido-donor ligands to create well defined reactive sites in reagents and catalysts

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Abstract
Ligand design in early transition metal chemistry has focussed recently on amide chemistry. The availability of two substituent positions at the amido N-donor atom allows its integration into ligand systems of both podand and macrocyclic topology. Amido functions may be combined with other donor functionalities which possess a different formal charge and chemical hardness and, more generally, a different thermodynamic and kinetic stability of their interaction with the metal centre. Early transition metal complexes containing polydentate amido-donor ligands not only display unprecedented patterns of reactivity but are the focus of recent developments in olefin polymerization catalysis.

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