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4,4,4-Trifluorobutyric acid chloride (6.4 g from above) in CH2Cl2 (80 ml) was treated with O,N-dimethylhydroxylamine hydrochloride (60.0 mmol, 5.85 g). The mixture was cooled to 0° C., then treated with pyridine (160.0 mmol, 12.9 ml), then allowed to warm to room temperature overnight. The mixture was diluted with CH2Cl2 (200 ml), then washed with brine(2×50 ml). Solvent was removed from the volatile product by simple distillation at atmospheric pressure to provide 20 g of 4,4,4-trifluoro-N-methoxy-N-methyl butyramide, which may be used without further purification. 1H NMR (CDCl3) δ3.70 (3H, s), 3.19 (3H, s), 2.78-2.65 (2H, m), 2.57-2.40 (2H, m).

1. temperatureto warm to room temperature overnight
2. washwashed with brine(2×50 ml)
3. customSolvent was removed from the volatile product by simple distillation at atmospheric pressure