Used as an intermediate in the synthesis of pharmaceuticals and agrochemicals, 4-Chlorotetrahydropyran serves as a building block for introducing the tetrahydropyranyl group, which can act as a protecting group for alcohols and other functional groups during organic synthesis. Its reactivity allows for nucleophilic substitution reactions, making it valuable in constructing complex molecules. It is also employed in the development of bioactive compounds where the oxygen-containing ring system contributes to desired solubility or metabolic stability properties.