Used primarily as a diazonium salt in organic synthesis, this compound is a key reagent for introducing the 4-methoxyphenyl group into various molecules. It is commonly employed in Sandmeyer reactions to create aryl derivatives, which are essential intermediates in the production of dyes, pharmaceuticals, and agrochemicals. Its ability to form stable diazonium ions makes it valuable for coupling reactions, particularly in the synthesis of complex organic compounds. Additionally, it is utilized in surface modification processes to functionalize materials with methoxy groups, enhancing their properties for specific industrial applications.