Copper(I) trifluoromethanethiolate is primarily used in organic synthesis as a reagent for introducing the trifluoromethylthio group (-SCF3) into various molecules. This group is highly valuable in medicinal chemistry and agrochemical research due to its strong electron-withdrawing properties and ability to enhance the metabolic stability and lipophilicity of compounds. It is particularly effective in cross-coupling reactions, enabling the synthesis of complex molecules with potential pharmaceutical applications. Additionally, it is employed in the preparation of advanced materials, where the trifluoromethylthio group can modify the electronic properties of polymers or small molecules for use in electronics or coatings. Its role in facilitating efficient and selective transformations makes it a key tool in modern synthetic chemistry.