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2-Bromo-1,1'-biphenyl (0.78 g, 3.34 mmol) was dissolved in dry THF (30 mL) under argon atmosphere, cooled to -78°C and stirred for 10 min at this temperature. A 2.5 M n-BuLi THF solution (1.47 mL, 3.67 mmol, 1.10 eq.) was then slowly injected via syri

4-bromo-9,9'-Spirobi[9H-fluorene has a spiro conjugation effect, which is characterized by making the molecules coplanar and the electron cloud averaged, and controlling the effective conjugation length while ensuring the length of the spiro molecular chain; rigid planar structure, high fluorescence quantum yield; compared with other positions, the position of the 4-bromo-9,9-spirobifluorene structure has higher reactivity and is extremely easy to be modified. Due to the above advantages, the synthesis of 4-bromo-9,9'-Spirobi[9H-fluorene has received more and more attention, and it has a wide range of applications in optoelectronic materials, organic solar cells, organic nonlinear materials, and fluorescent probes.