Used as a crosslinking agent in polymer chemistry, particularly in the synthesis of functionalized resins and dendrimers. Its dual bromomethyl groups readily undergo nucleophilic substitution, enabling efficient linkage with amines, thiols, or other nucleophiles. Commonly employed in the preparation of porous organic frameworks and as a building block in supramolecular chemistry. Also utilized in the modification of polymers to introduce reactive sites for further chemical derivatization.