Aminophenol based ligands have had a tremendous and continually growing impact on catalysis research. Their utility spans over a number of areas including homogeneous catalysis, small molecule activation, carbon dioxide reduction, and hydrogen evolution processes. For the development of a catalyst metal-ligand covalency is necessary via mutual cooperation and strong electronic coupling between a metal center and coordinating ligands. The role of o-aminophenol based ligands in different metabolic/enzymatic reactions in biological systems is now well documented. Their application is now expanding in the field of synthetic chemistry and highlighted recent applications in catalysis research. The prospective role of various o-aminophenol ligand-based redox levels and their influence on metal centers in catalysis has been widely studied. The present short review covers the catalytic applications of transition metal complexes based on sterically hindered functionalized o-aminophenol type ligands.
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