1. Imine ligands are hard donor ligands and the complex is charged. BArf anion
is ‘non-coordinating’. All these increase metal electrophilicity.
2. Bulky N-substituents prevent chain transfer.
3. Chelating di-imine ligand forces cis-disposition of vacant site and growing
polymer chain.
4. Ether is a weak ligand and can easily be substituted for an alkene to initiate
polymerisation