4-Hexylphenylboronic acid is primarily used 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 in the development of various drugs and bioactive molecules. The compound serves as a key intermediate in the synthesis of complex organic molecules due to its ability to form stable boron-carbon bonds. Additionally, it finds applications in material science, where it is used to modify surfaces and create functional materials with specific properties. Its role in catalysis and as a building block in polymer chemistry further highlights its versatility in industrial and research applications.