Used in organic synthesis as a Grignard reagent to introduce the cyclopropyl group into various molecules. It is particularly valuable in the preparation of pharmaceuticals, agrochemicals, and fine chemicals. Reacts with carbonyl compounds like aldehydes, ketones, and esters to form alcohols or other derivatives. Also employed in the synthesis of complex organic structures, including natural products and bioactive compounds. Its reactivity makes it a key tool in constructing cyclopropane rings, which are common in many drug molecules.