[CH2:1]([C:4]1[CH:9]=[CH:8][C:7](Br)=[CH:6][CH:5]=1)[CH2:2][CH3:3].[CH3:11][Si:12]([C:15]#[CH:16])([CH3:14])[CH3:13].C(N(CC)CC)C.Cl>[Cu]I.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.O>[CH2:1]([C:4]1[CH:9]=[CH:8][C:7]([C:16]#[C:15][Si:12]([CH3:14])([CH3:13])[CH3:11])=[CH:6][CH:5]=1)[CH2:2][CH3:3]To 15.0 g (75.4 mmol) of 1-n-propyl-4-bromobenzene were added 8.8 g (89.8 mmol) of trimethylsilylacetylene and 100 ml of triethylamine (NEt3), and the reaction system was purged with argon. Next were added 81 mg (0.4 mmol) of copper (I) iodide (CuI), 324 mg (1.2 mmol) of triphenylphosphine, and 162 mg of dichlorobistriphenylphosphine palladium (II) [PdCl2(PPh3)2] to the reaction system, and the mixture was subjected to reaction for 24 hours with heating and refluxing. After completion of the reaction, the reaction mixture was poured into an iced water, and the resultant mixture was acidified by adding hydrochloric acid. After the resultant water-insoluble oil was extracted with hexane, the hexane phase was washed with water. By removing hexane from the hexane phase, 14.2 g (65.7 mmol) of 1-(4-n-propylphenyl)-2-trimethylsilylacetylene was obtained.
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