[C:1]([C:5]1[CH:6]=[CH:7][C:8]([CH3:17])=[C:9]([C:11]#[C:12][Si](C)(C)C)[CH:10]=1)([CH3:4])([CH3:3])[CH3:2].C(=O)([O-])[O-].[K+].[K+]>CO>[C:1]([C:5]1[CH:6]=[CH:7][C:8]([CH3:17])=[C:9]([C:11]#[CH:12])[CH:10]=1)([CH3:4])([CH3:3])[CH3:2]Following general procedure F and using (5-tert-butyl-2-methyl-phenylethynyl)trimethyl-silane (Intermediate 109, 0.16 g, 0.66 mmol), methanol (5 mL) and potassium carbonate (0.05 g, 0.36 mmol), the title compound was obtained (0.08 g, 67%).
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