2-Chloro-5-ethylpyridine is primarily used as an intermediate in the synthesis of various chemical compounds, particularly in the pharmaceutical and agrochemical industries. In pharmaceuticals, it serves as a building block for the development of active pharmaceutical ingredients (APIs) that target specific diseases or conditions. Its structure allows for further functionalization, making it valuable in creating complex molecules. In agrochemicals, it is utilized in the production of pesticides and herbicides, where it contributes to the efficacy and stability of the final product. Additionally, it finds application in research and development, where it is used to study chemical reactions and develop new synthetic pathways. Its versatility and reactivity make it a key component in the production of specialized chemicals.