Bromoiodomethane is primarily used in organic synthesis as a reagent for introducing methylene groups into various compounds. It is particularly valuable in the preparation of cyclopropane derivatives through the Simmons-Smith reaction, where it acts as a carbene precursor. Additionally, it serves as a versatile intermediate in the synthesis of pharmaceuticals and agrochemicals, enabling the formation of complex molecular structures. Its dual halogen functionality allows for selective reactivity in cross-coupling reactions, making it useful in the development of fine chemicals. Bromoiodomethane is also employed in research settings for studying reaction mechanisms and exploring new synthetic pathways.