Used as an intermediate in the synthesis of pharmaceuticals, particularly in the production of non-steroidal anti-inflammatory drugs (NSAIDs). It serves as a key building block for introducing sulfonyl chloride functional groups, enabling further chemical modifications. Its reactivity makes it valuable in creating active pharmaceutical ingredients (APIs) through acylation and sulfonamide formation reactions. Also employed in the development of agrochemicals and specialty polymers due to its ability to link aromatic structures with functional side chains.