Used primarily as an intermediate in the synthesis of pharmaceuticals, particularly in the development of benzimidazole-derived drugs with antiparasitic, antiviral, and anticancer properties. Its reactive chloromethyl group allows for easy alkylation and functionalization, making it valuable in constructing complex heterocyclic systems. Commonly employed in the preparation of proton pump inhibitors and anthelmintic agents. Also utilized in agrochemical research for developing new fungicides and plant growth regulators. Its versatility in nucleophilic substitution reactions enhances its role in medicinal chemistry and drug design.