Potassium Carbonate → Pentyl 4-(3,4-dicyanophenoxy)benzoate

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A mixture of 4-nitrophthalonitrile (1.00 g, 7 mmol), pentyl 4-hydroxybenzoate (1.45 g, 7 mmol) and dried potassium carbonate (6.38 g, 46.2 mmol) in anhydrous DMF (50 mL) was stirred overnight at 85° C. under argon. After cooling to room temperature, the mixture was diluted with ethyl acetate (60 mL) and water (40 mL). The organic layer was separated, and the aqueous phase was extracted with ethyl acetate (2×50 mL). The combined organic layers were washed with a saturated solution of NaHCO3 (40 mL), brine (40 mL) and dried over anhydrous sodium sulfate. The solvents were removed in vacuo, and the crude product was purified by column chromatography on silica gel using a dichloromethane/acetonitrile mixture (20:1) as an eluent to give the product in 85% yield. [1H NMR (δ, ppm, CDCl3): 8.15 (d, 2H, J=8.7 Hz), 7.77 (d, 1H, J=8.7 Hz), 7.35 (d, 1H, J=2.3 Hz), 7.30 (d, 1H, J=8.7 Hz), 7.12 (d, 2H, J=8.7 Hz), 4.34 (2H, t, OCH2, J=6.7 Hz), 1.79 (m, 2H, CH2), 1.42 (m, 4H, CH2CH2), 0.94 (t, 3H, J=7 Hz, CH3).]

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