Used primarily as an intermediate in organic synthesis, especially in the production of pharmaceuticals and agrochemicals. It reacts readily with amines and alcohols to form amides and esters, making it valuable in building complex molecules. Commonly employed in the synthesis of active pharmaceutical ingredients where its acylating properties help introduce the isovaleryl group. Also utilized in the preparation of fragrances and flavoring agents due to its ability to form esters with volatile, aromatic characteristics. Its reactivity requires careful handling, but it remains a key reagent in fine chemical manufacturing.