p-Bromoacetophenone → 1-[4-(Thiophen-2-yl)phenyl]ethan-1-one

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Ex-17A: 4′-Bromoacetophenone (3.98 g, 20 mmol) was dissolved in ethylene glycol dimethyl ether and then the solution was degassed with nitrogen for 15 minutes. Tetrakis(triphenylphosphine)palladium(0) (2.31 g, 2 mmol) was added, and the solution was further degassed for 10 minutes. Thiophene-2-boronic acid (3.07 g, 24 mmol) was added followed by the addition of sodium carbonate solution (2 M, 45 mL). The mixture was stirred at reflux under nitrogen overnight. Most of the solvent was removed, and water was added to the remainder. The solid was filtered out and recrystallized from ethanol and water to give 3.85 g of the desired 4′-(thien-2-yl)acetophenone as a solid, 95% yield. 1H-NMR (CDCl3) δ 7.97 (d, J=9 Hz, 2H), 7.70 (d, J=9 Hz, 2H), 7.44 (d, J=4 Hz, 1H), 7.38 (d, J=5 Hz, 1H), 7.11–7.14 (m, 1H), 2.62 (s, 3H). HMRS (EI) calcd. for C12H10OS: 202.0452; found: 202.0454.

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