Used as an intermediate in organic synthesis, particularly in the pharmaceutical industry for constructing complex molecules. Its reactive chloromethyl group allows for easy attachment to other molecular frameworks, making it valuable in the development of active pharmaceutical ingredients (APIs). Commonly employed in alkylation reactions and in the preparation of heterocyclic compounds. Also utilized in the synthesis of polymers and specialty chemicals where a protected alcohol functionality is required, due to the stability of the tetrahydro-pyran ring under various reaction conditions.