4-Chloro-3-Ethoxyphenylboronic Acid is primarily utilized in organic synthesis, particularly in Suzuki-Miyaura cross-coupling reactions. This reaction is widely employed in the pharmaceutical industry for the construction of biaryl compounds, which are essential intermediates in the development of various drugs. The compound serves as a key building block for creating complex molecules due to its boronic acid group, which facilitates the formation of carbon-carbon bonds. Additionally, it is used in the synthesis of agrochemicals and materials science, where it contributes to the development of novel polymers and advanced materials. Its stability and reactivity make it a valuable reagent in research and industrial applications.