Idaein chloride is primarily used in biochemical research as a reagent for studying enzymatic reactions and cellular processes. It is often employed in assays to investigate the activity of specific enzymes, particularly those involved in redox reactions, due to its ability to interact with biological molecules. Additionally, it serves as a tool in the synthesis of complex organic compounds, where it acts as a catalyst or intermediate in various chemical transformations. Its applications also extend to the field of pharmacology, where it is utilized in the development and testing of new drugs, particularly those targeting oxidative stress-related conditions.