Used primarily as an intermediate in the synthesis of agrochemicals and pharmaceuticals. It serves as a sulfonating agent in organic reactions, enabling the introduction of sulfonyl groups into target molecules. Commonly applied in the development of herbicides and plant growth regulators due to its reactivity with amines and alcohols. Also utilized in the preparation of sulfonamide derivatives, which are key structural motifs in certain drug compounds. Its ethoxy-substituted aromatic ring enhances solubility and influences the electronic properties of the final product, improving efficacy in crop protection formulations.