2,2',7,7'-Tetrabromo-9,9'-spirobifluorene

159-66-0

128055-74-3

General procedure for the synthesis of 2,2',7,7'-tetrabromo-9,9'-spirobifluorene from 9,9'-spirobifluorene: 80 mg (0.5 mmol) of anhydrous FeCl3 was added to 30 ml of dichloromethane solution containing 3.16 g (10.0 mmol) of 9,9'-spirobifluorene. A solution of 2.1 ml (41 mmol) of bromine dissolved in 5 ml of dichloromethane was added slowly and dropwise over 10 min. The reaction mixture was refluxed for 6 hours. After completion of the reaction, it was cooled to room temperature and the product precipitated as a precipitate. The precipitate was collected by diafiltration and washed with a small amount of cold dichloromethane. Drying gave 6.0 g (95% yield) of the target product 2,2',7,7'-tetrabromo-9,9'-spirobifluorene as a white solid.