What is the reductant in preparation of vo acac 2?

In the preparation of vanadium(III) acetylacetonate (vo(acac)₂), the reductant commonly used is a metal such as zinc or aluminum. These metals reduce vanadium compounds, typically vanadium(V) species, to vanadium(III) while facilitating the coordination of acetylacetone (acac) ligands to the vanadium center. The reaction forms the desired vanadium(III) complex, which is characterized by its distinct color and stability in solution.