Used as a Grignard reagent in organic synthesis to introduce the tert-butyl group into various organic compounds. It is particularly valuable in the preparation of complex molecules, including pharmaceuticals and agrochemicals. The reagent is also employed in the synthesis of tertiary alcohols, ketones, and carboxylic acids through its reaction with carbonyl compounds. Additionally, it plays a role in polymerization processes and the modification of polymers to enhance their properties. Its strong nucleophilic character makes it useful in creating carbon-carbon bonds, a fundamental step in building intricate organic structures.