2,4-Dichloro-5-(chlorosulphonyl)benzoic acid is primarily used as a key intermediate in the synthesis of sulfonylurea herbicides, which are highly effective against broadleaf weeds in crops such as rice, corn, and soybeans. It serves as a crucial building block, enabling the formation of the sulfonylurea structure essential for the herbicide's selectivity and low-dose efficacy, thereby reducing production costs and environmental impact. The reactive chlorosulphonyl group facilitates attachment to urea moieties, allowing targeted inhibition of plant growth enzymes. Additionally, it finds applications in research and development of novel agrochemicals and other fine chemicals requiring precise sulfonylation reactions.