4-Ethylfuran-2-boronic acid is primarily used in organic synthesis as a building block for the construction of more complex molecules. It is particularly valuable in Suzuki-Miyaura cross-coupling reactions, where it acts as a boronic acid partner to form carbon-carbon bonds with aryl or vinyl halides. This reaction is widely employed in the pharmaceutical industry to create intermediates for drug development. Additionally, it finds application in material science for the synthesis of organic electronic materials, such as polymers and small molecules used in organic light-emitting diodes (OLEDs) and other optoelectronic devices. Its furan ring structure also makes it a candidate for developing bioactive compounds in medicinal chemistry.