Used as a reagent in organic synthesis, particularly in the formation of carbon-carbon bonds through Grignard-type reactions. It serves as a source of nucleophilic magnesium species when reacting with organic halides, enabling the synthesis of alcohols, carboxylic acids, and other functionalized compounds. The diethyl etherate form enhances solubility and stability in ethereal solvents, making it suitable for reactions requiring controlled moisture and oxygen-free conditions. Commonly employed in pharmaceutical and fine chemical manufacturing where precise reactivity and reproducibility are critical.