Potassium Carbonate → 4-(4-Nitro-3-hydroxy-2,5,6-trifluoro-phenoxy)-4'-(4-benzyloxycarbonylphenoxy)octafluoro-biphenyl

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Reaction Steps

50 g of 4-(4-benzyloxycarbonylphenoxy)nonafluoro-biphenyl prepared as described in Example 3 (0.092 mol) and 19.4 g of 4-nitrotetrafluorophenol prepared as described in Example 4 (0.092 mol) are dissolved in 400 ml of dimethyl sulfoxide. 25 g of potassium carbonate (0.184 mol) are added in portions to the solution. The mixture is then stirred at room temperature for 24 hours and then heated at 60° C. for 24 hours, and 10 g of potassium hydrogencarbonate (0.1 mol) are then added. The reaction solution is ten cooled to room temperature and filtered through a fluted filter. The crude product is washed by shaking with 300 ml of ethyl acetate and 700 ml of water, and the organic phase is washed three times with water and evaporated in a rotary evaporator until the reaction product precipitates out. The reaction product is then recrystallized from a mixture of ethyl acetate and n-hexane (volume ratio 1:1) and then dried for 48 hours under nitrogen at 40° C./10 mbar in a vacuum drying cabinet (yield: 92%).

Provenance & Evidence