1-(2-Chloroethyl)naphthalene is primarily used in organic synthesis as an intermediate for the production of various chemical compounds. It plays a role in the development of pharmaceuticals, particularly in the synthesis of active pharmaceutical ingredients (APIs) that require naphthalene derivatives. Additionally, it is utilized in the creation of dyes and pigments, contributing to the coloration of textiles, plastics, and other materials. In research, this compound serves as a building block for studying chemical reactions and developing novel organic molecules with potential industrial or medicinal applications. Its reactivity makes it valuable in polymer chemistry for modifying or enhancing the properties of polymeric materials.