Perfluorocyclopentene → 4-(5-(4-Methoxyphenyl)-4-(perfluorocyclopent-1-en-1-yl)thiophen-2-yl)benzonitrile

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To a solution of (57) (5.0 g, 13.50 mmol) in dry THF (300 mL) was slowly added n-BuLi hexane solution (2.0 M, 7.43 mL, 14.85 mmol) at −50° C. under an argon atmosphere. The solution was stirred for 15 minutes at −50° C. After the addition of octafluorocyclopentene (5.44 mL, 40.5 mmol), the reaction mixture was stirred for 2 h. The reaction was quenched by the addition of methanol and warmed to RT. The solvents were removed by rotary evaporation and flash chromatography (10% EtOAc in hexanes) afforded a dark yellow oil (4.0 g, 61.3%).

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