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0 °C

To a solution of the above prepared 2,5-dibromo-3-iodothiophene (3.43 grams, 9.3 mmol) and 1-decyne (1.45 grams, 10.5 mmol) in triethylamine (50 milliliters) were added dichlorobis(triphenylphosphine)palladium (II) (0.28 gram, 0.4 mmol) and copper(I) iodide (38 milligrams, 0.2 mmol) at 0° C. under argon. The reaction mixture was stirred at 0° C. for 6 hours and at room temperature for 20 hours under argon. After evaporation of the solvent, the product was purified by column chromatography on silica gel using hexane as eluent. 2,5-Dibromo-3-decynylthiophene was thus obtained as a colorless liquid was. Yield: 3.32 grams (94 percent).

1. customAfter evaporation of the solvent
2. customthe product was purified by column chromatography on silica gel