Bromotriethylsilane is primarily used as a reagent in organic synthesis, particularly in the protection and deprotection of hydroxyl groups. It is often employed to convert alcohols into their corresponding triethylsilyl ethers, which are stable under various reaction conditions. This protection allows for selective reactions to occur at other functional groups in the molecule without interference. Additionally, it is utilized in the preparation of silicon-containing compounds, which are valuable in materials science and pharmaceuticals. Its role in modifying surfaces and creating silicon-based polymers also makes it relevant in the development of advanced materials and coatings.