4-Isopropoxybenzoyl chloride is primarily used as a key intermediate in organic synthesis, particularly in the production of pharmaceuticals and agrochemicals. It is often employed in the acylation reactions to introduce the isopropoxybenzoyl group into target molecules, which can enhance their biological activity or stability. This compound is also utilized in the synthesis of specialty chemicals, such as UV absorbers and photoinitiators, which are essential in coatings, adhesives, and polymer industries. Its reactivity with various nucleophiles makes it a versatile building block for creating complex organic compounds.