The rate of amine coordination depends on the catalyst and the substrate
properties. When the amine substrate is more basic and/or is sterically
unhindered, the rate of amine binding is higher. The rate of deprotonation of the
bound amine is determined by the acidity of the amine, which increases on
coordination to the metal. Reductive elimination is a function of the metal/ligand
properties. Since reductive elimination causes the metal to be more electron-rich
and reduces the steric strain, bulkier and electron poor ligands will increase the
rate of reductive elimination.