2-Chloro-4-ethoxyphenylboronic acid is primarily used in organic synthesis, particularly in Suzuki-Miyaura cross-coupling reactions. This reaction is widely employed in the pharmaceutical industry to create complex biaryl compounds, which are essential in drug development. The compound acts as a key intermediate in the synthesis of various active pharmaceutical ingredients (APIs) due to its ability to facilitate the formation of carbon-carbon bonds. Additionally, it is utilized in materials science for the preparation of advanced organic materials, including polymers and liquid crystals, which have applications in electronics and display technologies. Its unique structure also makes it valuable in the development of agrochemicals, where it contributes to the synthesis of herbicides and pesticides.