Iodine trichloride is primarily used as a chlorinating agent in organic synthesis, where it facilitates the introduction of chlorine atoms into various organic compounds. It is particularly effective in chlorinating aromatic compounds, enabling the production of chlorinated derivatives that are valuable intermediates in the manufacture of pharmaceuticals, agrochemicals, and dyes. Additionally, it serves as a powerful oxidizing agent in certain chemical reactions, aiding in the conversion of alcohols to aldehydes or ketones. In analytical chemistry, it is employed for iodometric titrations to determine the concentration of reducing agents. Its strong reactivity also makes it useful in the preparation of other iodine compounds and in specialized laboratory processes requiring precise halogenation.