Trans-2,4-Dichlorocinnamic acid is widely used in organic synthesis as a building block for the preparation of more complex molecules. It serves as a key intermediate in the production of pharmaceuticals, particularly in the development of compounds with potential anti-inflammatory and antimicrobial properties. Its structure allows it to participate in various chemical reactions, such as coupling reactions, making it valuable in the synthesis of heterocyclic compounds. Additionally, it is utilized in research for studying the effects of halogenated cinnamic acids on biological systems, providing insights into their mechanisms of action. In material science, it can be incorporated into polymers to modify their properties, such as enhancing UV absorption or improving thermal stability.