A 100 ml four-necked flask equipped with a reflux tube, a thermometer and a dropping funnel was thoroughly purged with nitrogen and dried. To the flask, 2-methyl-4-i-propyl-7-methylindene (1.50 g, 8.06 mmol) and dehydrated ether (25 ml) were introduced. Under stirring at −78° C., a hexane solution of n-butyllithium (8.46 mmol) was dropwise added. After the dropwise addition, the temperature of the system was allowed to spontaneously and slowly rise to room temperature. The reaction mixture was stirred at room temperature over night, whereby a colourless solution came, through a white slurry and a light yellow slurry, to a yellow slurry. To the slurry, the dimethyl(9-fluorenyl)silane chloride (2.06 g, 8.06 mmol) synthesized above was added under stirring at 0° C., followed by stirring at room temperature for 1.5 hours. After ether (100 ml) and a saturated ammonium chloride aqueous solution (100 ml) were added, the resulting mixture was introduced into a separatory funnel to separate out an organic phase. The organic phase was washed with a saturated ammonium chloride aqueous solution, water and a saturated sodium chloride aqueous solution, and dried over anhydrous magnesium sulfate. After the solvent was removed, the obtained product (a yellow oil) was purified by column chromatography (developer: hexane) to obtain 1.50 g so a yellow oil (yield: 46%).
