Diphenyl ditelluride is primarily used in organic synthesis as a reagent for various chemical reactions. It serves as a tellurium source in the preparation of organotellurium compounds, which are valuable intermediates in synthetic chemistry. The compound is also employed in the synthesis of tellurium-containing heterocycles, which have applications in materials science and pharmaceuticals. Additionally, it can act as a catalyst or catalyst precursor in certain organic transformations, such as the reduction of organic compounds or the formation of carbon-heteroatom bonds. Its unique reactivity makes it useful in the development of new synthetic methodologies and in the study of tellurium chemistry.