Used primarily as an intermediate in the synthesis of pharmaceuticals and agrochemicals. It plays a key role in the preparation of α-phenylacetylaminoketones, which are building blocks for certain antibiotics and psychoactive drugs. Also employed in the production of pesticides due to its ability to introduce phenylacetyl groups into active molecules. Its reactivity makes it valuable in organic synthesis for forming amides, esters, and other derivatives through acylation reactions. Handle with care due to high reactivity and lachrymatory effects.