Used as a key intermediate in the synthesis of fluorescent dyes and optical brighteners due to its reactive bromomethyl group and coumarin backbone. The compound is valuable in organic synthesis for introducing the coumarin moiety into larger molecules, especially in the development of photoluminescent sensors and bioimaging agents. Its reactivity allows for easy functionalization in nucleophilic substitution reactions, making it useful in pharmaceutical research for building more complex heterocyclic systems. Also employed in the preparation of nonlinear optical materials and UV-absorbing polymers.