Sulfuric Acid → Ethyl 4,4,4-trifluoro-3-(nitromethyl)butanoate

Beteiligte Stoffe

Reaktionsschritte

A mixture of 4.203 g (25 mmol) of ethyl 4,4,4-trifluoro-crotonate, 20 mL of nitromethane and ca. 0.576 g (5 mmol) of tetramethyl guanidine was stirred for 13 h at room temperature, and then diluted with water and acidified by the addition of 0.5 M sulfuric acid. The mixture was extracted three times with diethyl ether. The combined ether extracts were washed with water, and then brine, dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure. to give 5.601 g (98%) of 4,4,4-trifluoro-3-nitromethyl-butyric acid ethyl ester as an amber oil. 1H NMR (400 MHz, DMSO-d6) δ ppm 1.21 (t, J=7.15 Hz, 3H) 2.76 (dd, J=6.53, 1.76 Hz, 2H) 3.61-3.84 (m, 1H) 4.13 (q, J=7.11 Hz, 2H) 4.83-5.01 (m, 2H).

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