[CH3:1][O:2][C:3]1[C:11]2[C:6](=[CH:7][CH:8]=[CH:9][CH:10]=2)[CH2:5][CH:4]=1.[CH2:12]([Li])[CH2:13][CH2:14][CH3:15].Br[CH2:18][CH2:19]Br>C1COCC1.CCCCCC>[CH3:1][O:2][C:3]1[C:11]2[C:6](=[CH:7][CH:8]=[CH:9][CH:10]=2)[CH:5]([CH2:15][CH2:14][CH:13]2[C:12]3[C:4](=[CH:5][CH:6]=[CH:18][CH:19]=3)[C:3]([O:2][CH3:1])=[CH:11]2)[CH:4]=110.9 g (75 mmol) of 3-methoxyindene (prepared as described in J. Am. Chem. Soc. 106 (1984) 6702) were dissolved in 100 ml of THF, and 47 ml (75.2 mmol) of a 1.6M butyllithium solution in hexane were added. The mixture was stirred at 50° C. for 2 hours, 3.25 ml (30.1 mmol) of 1,2-dibromoethane in 30 ml of THF were added dropwise at -78° C., and the mixture was warmed to room temperature. The solvent was stripped off, and the product was extracted with toluene. Yield 6.2 g (64%).
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