C([Li:5])CCC.[CH3:6][Si:7]([CH3:21])([CH3:20])[O:8][CH2:9][CH2:10][C:11]1[C:19]2[C:14](=[CH:15][CH:16]=[CH:17][CH:18]=2)[CH2:13][CH:12]=1>CCCCCC.CCOCC>[CH3:20][Si:7]([CH3:6])([CH3:21])[O:8][CH2:9][CH2:10][C-:11]1[C:19]2[C:14](=[CH:15][CH:16]=[CH:17][CH:18]=2)[CH:13]=[CH:12]1.[Li+:5]10.3 ml (16.4 mmol) of a 1.6 M butyllithium solution in hexane was added to 3.8 g (16.4 mmol) of [3-(2-trimethylsiloxyethyl)indene] in ether at −78° C. The immediate formation of a white solid was observed. The mixture was maintained under stirring for 2 h. Then the solvent was removed under vacuum and the residue was washed twice with 25 ml of hexane to give a white solid. (3.6 g, 15 mmol, yield: 91.5%).
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