Triphenylarsine oxide is primarily utilized in organic synthesis as a reagent or intermediate. It plays a role in the preparation of various organoarsenic compounds, which are often studied for their potential applications in materials science and coordination chemistry. Additionally, it has been explored in catalytic processes, where it can act as a ligand to stabilize metal complexes, enhancing their reactivity or selectivity in certain chemical reactions. In research, it is sometimes used to investigate the behavior of arsenic-containing compounds in environmental or biological systems, contributing to studies on toxicity and remediation. Its application is largely confined to laboratory settings due to its specialized nature.