Used as a key intermediate in organic synthesis, particularly in pharmaceutical manufacturing. It serves as an alkylating agent due to the reactive chloromethyl group, enabling the attachment of the tetrahydro-2H-pyran moiety to other molecules. This property makes it valuable in constructing complex drug molecules where controlled lipophilicity and metabolic stability are desired. Commonly employed in the synthesis of protease inhibitors and other bioactive compounds. Also utilized in the preparation of functionalized polymers and resins for solid-phase synthesis. Its cyclic ether structure enhances solubility and influences the conformation of final products.