3-Bromo-9,9-dimethyl-9H-fluorene（Cat No.:L018745）is a brominated polycyclic aromatic hydrocarbon featuring a fluorene core substituted with two methyl groups at the 9-position and a bromine atom at the 3-position. The bulky dimethyl groups enhance thermal stability and rigidity, while the bromine atom provides a reactive site for cross-coupling reactions such as Suzuki, Stille, or Heck, enabling the synthesis of complex organic frameworks. This compound is commonly used as a building block in the development of organic semiconductors, OLEDs, and advanced polymers, where its structural rigidity and electronic properties contribute to performance and durability.