5-Chloro-2-iodobenzoic acid is primarily used as an intermediate in organic synthesis, particularly in the preparation of more complex chemical compounds. It is often employed in pharmaceutical research for the development of active pharmaceutical ingredients (APIs), where its unique structure allows for the introduction of both chloro and iodo functional groups into target molecules. Additionally, it serves as a building block in the synthesis of agrochemicals, such as herbicides and pesticides, due to its ability to modify biological activity. In material science, this compound is utilized in the creation of specialized polymers and coatings, where its halogenated aromatic structure contributes to desired properties like stability and reactivity. Its role in cross-coupling reactions, such as Suzuki or Sonogashira reactions, is also notable, making it valuable in the production of fine chemicals and advanced materials.