Which mechanism causes reduced catalytic activity when transition metal catalysts form ligands with strong delocalized pi orbitals?

💡 Explanation

When transition metal catalysts form ligands with strong pi orbitals, backbonding from the metal d-orbitals into the ligand pi* orbitals causes depletion of electron density at the metal center, hindering its ability to activate substrates. Therefore backbonding electron density depletion drives reduced activity, rather than steric constraints, blockage, or oxidation which entail different mechanistic processes.

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