Tetraphenylgermane is primarily used in organic synthesis as a reagent or intermediate. It serves as a source of phenyl groups in various chemical reactions, particularly in the preparation of organogermanium compounds. Its applications extend to materials science, where it is utilized in the development of polymers and coatings with specific thermal and optical properties. Additionally, it finds use in research and development for studying the behavior of germanium-containing compounds in catalytic processes. Its stability and structure make it a valuable component in the creation of advanced materials and specialized chemical products.