9-Bromofluorene is primarily used as an intermediate in organic synthesis, particularly in the production of pharmaceuticals and agrochemicals. Its structure allows it to act as a building block for more complex molecules, often serving as a precursor in the synthesis of fluorenone derivatives, which are valuable in medicinal chemistry. Additionally, it is employed in the development of organic semiconductors and optoelectronic materials due to its ability to modify electronic properties. In research, it is utilized to study cross-coupling reactions, which are essential in creating carbon-carbon bonds for advanced chemical compounds.