Used primarily in organic synthesis, 4-cyanothiophenol serves as a key intermediate in the production of pharmaceuticals and agrochemicals. Its functional groups make it valuable for constructing complex molecules, particularly in the development of active pharmaceutical ingredients (APIs). Additionally, it is employed in the synthesis of dyes and pigments, contributing to vibrant and stable colorants. In material science, it is utilized for surface modification and as a building block for advanced polymers. Its role in cross-coupling reactions also makes it significant in the creation of specialty chemicals and fine compounds.