Used primarily as an intermediate in the synthesis of agrochemicals and pharmaceuticals. Its reactivity makes it suitable for introducing acyl groups in the production of herbicides and insecticides. Commonly employed in the preparation of active ingredients where a chlorinated butyryl moiety is required. Also utilized in organic synthesis for constructing complex molecules due to its ability to form amides, esters, and ketones under controlled conditions. Handling requires caution due to its moisture sensitivity and potential to release hydrogen chloride upon hydrolysis.