Used as a Grignard reagent in organic synthesis to introduce the tert-butyl group into molecules. It is particularly valuable in the preparation of complex organic compounds, including pharmaceuticals and fine chemicals. The reagent reacts with carbonyl compounds, such as aldehydes and ketones, to form tertiary alcohols. It is also employed in the synthesis of polymers and specialty materials. Due to its high reactivity, it requires careful handling under inert conditions to prevent decomposition or unwanted side reactions. Its applications extend to the development of catalysts and intermediates in various industrial processes.