Perfluorocyclopentene → 3,3'-(Perfluorocyclopent-1-ene-1,2-diyl)bis(2,5-bis(4-(tert-butyl)phenyl)thiophene)

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Reaction Steps

A solution of (30) in anhydrous THF/ether cooled to −45° C. and treated with nBu—Li-(2.5 M in hexanes, 35 mL, 87 mmol) dropwise under a n argon atmosphere. The reaction mixture was stirred for a further 15 minutes followed by addition of octafluorocyclopentene (5.6 mL, 41.5 mmol) using a cooled gas tight syringe. The reaction was allowed to stir until the temperature reached −10° C., quenched by the addition of 10% HCl (50 mL). The aqueous layer was separated and extracted with ether. The organic phases were separated and pooled, dried over MgSO4, filtered and solvent removed by rotary evaporation. The crude product was stirred in MeOH for 3 hours, and the resulting precipitate filtered, dried and purified using flash chromatography (hexanes), affording 2 fractions—F1 was pure S006 (TLC), F2 contained S006 along with a fluorescent byproduct by TLC. F1, 5.35 g, 14.8%) and F2, 10.4 g (˜75% pure, 22%) as light yellow, powdery solids. 1H NMR (400 MHz, CDCl3) δ 7.37 (d, J=8.5 Hz, 4H), 7.30 (d, J=8.5 Hz, 4H), 7.05 (d, J=8.4 Hz, 4H), 6.92 (d, J=8.4 Hz, 4H), 6.13 (s, 2H), 1.34 (s, 18H), 0.91 (s, 18H).

Provenance & Evidence