Used as a strong nucleophile in organic synthesis, particularly in carbon-carbon bond-forming reactions. It is commonly employed to introduce nonyl groups into carbonyl compounds such as aldehydes, ketones, and esters, yielding secondary and tertiary alcohols after hydrolysis. Its reactivity makes it valuable in the preparation of intermediates for pharmaceuticals, agrochemicals, and specialty chemicals. Due to its sensitivity to moisture and air, it is typically handled under inert atmosphere conditions like nitrogen or argon.