CO.[OH-].[K+].[CH2:5]([Si:8]([CH3:25])([CH3:24])[Si:9]([CH3:23])([CH3:22])[C:10]1[CH:15]=[CH:14][C:13]([C:16]#[C:17][Si](C)(C)C)=[CH:12][CH:11]=1)[CH:6]=[CH2:7]>Cl>[CH2:5]([Si:8]([CH3:24])([CH3:25])[Si:9]([C:10]1[CH:15]=[CH:14][C:13]([C:16]#[CH:17])=[CH:12][CH:11]=1)([CH3:23])[CH3:22])[CH:6]=[CH2:7]45 mL of methanol containing 1.98 g (30 mmol) of potassium hydroxide was added to 45 mL of methanol containing 9.92 g (30 mmol) of 1-allyl-1,1,2,2-tetramethyl-2-(4-trimethylsilanylethynylphenyl) disilane to obtain a mixture, which was stirred for 30 minutes at a temperature of 0° C. Further, the resultant solution was turned acidic by adding 30 mL of 1M hydrochloric acid thereto and subjected to extraction using ether. The organic layer thus created was then washed with saturated sodium hydrogen carbonate and also with saturated brine and dried using magnesium sulfate as a desiccating agent. After the desiccating agent was removed by filtration, the solvent was removed by a rotary evaporator to obtain a crude product, which was then purified by silica gel column chromatography (developing solvent: hexane) to obtain 5.03 g (19.44 mmol) of 1-allyl-2-(4-ethynyl-phenyl)-1,1,2,2-tetramethyl-disilane (4a) which was colorless and oily. The yield was 65%.
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