Used primarily as an intermediate in organic synthesis, this compound is valuable for introducing the isoquinoline moiety into more complex molecules. It finds application in the development of pharmaceuticals, particularly in the synthesis of compounds with potential biological activity. The sulfonyl chloride group allows for further functionalization, making it useful in creating sulfonamides, which are common in drug design. Additionally, it is employed in research settings for the preparation of dyes, agrochemicals, and other specialty chemicals. Its reactivity and versatility make it a key reagent in medicinal chemistry and material science.