Used primarily in organic synthesis, this compound serves as a key reagent for introducing the 3,5-dichlorophenyl group into various molecules. It is particularly valuable in the preparation of azo dyes, where it facilitates the formation of stable diazo linkages, enhancing colorfastness and dye stability. Additionally, it is employed in the modification of polymers and surfaces, enabling the attachment of functional groups that improve material properties. Its role in cross-coupling reactions also makes it useful in pharmaceutical research for constructing complex molecular architectures. Handling requires caution due to its reactive diazonium group, which can decompose under certain conditions.