4-Chlorocinnamic acid is widely used in organic synthesis as a building block for the preparation of various pharmaceutical compounds. Its structure makes it a valuable intermediate in the synthesis of biologically active molecules, including anti-inflammatory and antimicrobial agents. Additionally, it is employed in the development of liquid crystal materials due to its ability to influence molecular alignment. In research, it serves as a precursor for studying structure-activity relationships in medicinal chemistry. Its UV-absorbing properties also make it useful in the formulation of sunscreens and other photoprotective products. Furthermore, it is utilized in polymer chemistry to modify and enhance the properties of certain materials.