Di-n-octyl sulfoxide is primarily utilized as a solvent in various industrial applications due to its ability to dissolve a wide range of organic and inorganic compounds. It is particularly effective in extraction processes, where it is used to separate and purify specific substances from complex mixtures. In the pharmaceutical industry, it serves as a reagent in the synthesis of certain drugs, aiding in the formation of desired chemical structures. Additionally, it is employed in the production of specialty chemicals, where its solvation properties enhance reaction efficiencies. Its stability and low volatility make it suitable for high-temperature applications, such as in the formulation of heat-resistant materials. Furthermore, it finds use in research laboratories as a medium for studying chemical reactions and material properties.