3-Bromo-9H-fluoren-9-one（Cat No.:L026767）is a brominated fluorenone derivative featuring a bromine atom at the 3-position and a ketone group at the 9-position of the fluorene core. This compound serves as a versatile intermediate in organic synthesis, particularly in cross-coupling reactions such as Suzuki, Heck, and Sonogashira, where the bromine acts as a reactive site for C–C bond formation. The rigid, conjugated fluorenone scaffold imparts desirable photophysical and electronic properties, making it useful in the development of organic semiconductors, OLED materials, and dye molecules in materials science and pharmaceutical research.