4-Mercaptophenol is widely used in the field of organic synthesis, particularly as a building block for the creation of more complex molecules. Its thiol group makes it a valuable reagent in the formation of thioethers and other sulfur-containing compounds, which are essential in various chemical processes. In material science, it is employed to modify surfaces, especially in the preparation of self-assembled monolayers (SAMs) on gold or other metals, enhancing the properties of materials for sensors or electronic devices. Additionally, it serves as a precursor in the synthesis of pharmaceuticals and agrochemicals, where its unique structure contributes to the development of biologically active compounds. Its applications also extend to the field of analytical chemistry, where it is used as a derivatizing agent to improve the detection and quantification of certain analytes.