Vanadium-Aminophenolates: Control of Vanadium Precursors and Effect of Substituents on Ligands in their Syntheses and Catalytic Properties

Synthesis of vanadium complexes of aminophenolate ligands is generally influenced by metal precursors used, and electronic and steric properties originating due to substituents present on the phenyl ring of ligands. These influences have resulted in the development of interesting vanadium-aminophenolate chemistry in +II to +V oxidation states. These complexes have also been frequently explored as catalysts for various organic transformations. This review examines the vanadium-aminophenolate complexes isolated under different reaction conditions and characterized in various oxidation states and arranges them according to the complexing functionality of ligands and oxidation states. Wherever applicable, influence of vanadium precursors and substituents on the phenyl ring of ligands has also been highlighted. An account of various catalytic applications reported by these complexes has also been the part of this review.