Trifluoromethanesulfonic acid → HCID 123952003, compound

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Reaction Steps

In an argon atmosphere, to a tetrahydrofuran solution (1 ml) of 52 mg (0.15 mmol) of octaethylcyclotetrasilane was added 0.71 ml (0.10 mmol) of a tetrahydrofuran solution (0.14M) of phenyldimethylsilyllithium, and stirred at 0° C. for 15 minutes. Then, tetrahydrofuran was distilled out under vacuum, and hexane (1 ml) was added to give a hexane solution (Solution 1). A dichloromethane solution (1 ml) of 27 mg (0.05 mmol) of 2,2,3,3,4,4,5,5-octaethyl-1,1,6,6,6-pentamethyl-1-phenylhexasilane (2) obtained in Example 2 was treated with 7.5 mg (0.05 mmol) of trifluoromethanesulfonic acid at room temperature for 30 minutes to give 1-(trifluoromethanesulfonyloxy)hexasilane. Then, dichloromethane was distilled out under vacuum, and hexane (1 ml) was added to give a hexane solution (Solution 2). The Solution 1 was added to the Solution 2 at -78° C. and stirred for 15 minutes. Methanol (0.1 ml) and triethylamine (0.1 ml) were added, then saturated aqueous sodium bicarbonate solution (2 ml) was added, stirred, the hexane layer was separated, and dried with magnesium sulfate. The resulting crude product was purified by a silica gel column chromatography (hexane) to afford 41 mg (86% yield) of undecasilane (8) as a colorless crystal.

Provenance & Evidence