Used as a crosslinking agent in polymer chemistry, particularly in the synthesis of porous organic frameworks and covalent organic frameworks (COFs). Its four bromomethyl groups readily undergo nucleophilic substitution, enabling the formation of strong covalent bonds with amines, thiols, or other nucleophiles. This makes it valuable in constructing 3D network polymers for applications in gas storage, catalysis, and molecular separation. It is also employed in the preparation of functional resins and as a building block in supramolecular chemistry due to its rigid benzene core and multiple reactive sites.