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8,9-dihydro-4H-cyclopenta[def]phenanthrene (4.0 g, 20.8 mmol) was put into a 250 ml round bottom flask (RBF), and CCl4 (100 ml) was added thereto. The reaction mixture was cooled to 0° C., and Br2 (3.3 g, 20.8 mmol) was dropwise added thereto. The reaction solution was incubated for 4 hours and a 10% NaSO3 solution was added thereto. The organic phase was separated, concentrated under a reduced pressure, and recrystallized from n-hexane to obtain 4.7 g of a 2-bromo-8,9-dihydro-4H-cyclopenta[def]phenanthrene compound.

1. customThe organic phase was separated
2. concentrationconcentrated under a reduced pressure
3. customrecrystallized from n-hexane