Hexafluoropropylene oxide → 2,3,3,3-Tetrafluoro-2-methoxypropanoic acid

2-Methoxytetrafluoropropionic acid is prepared by the method described in J. Org. Chem 31 2312, (1966) from hexafluoropropene oxide. 5.25 g of this acid are treated with 3.5 g of potassium hydrogencarbonate in 10 ml of water. After reaction, the water is evaporated off at reduced pressure and the solid residue is extracted with 20 ml of methyl formate. After evaporation of the organic solution, the salt K[CH3OCF(CF3)CO2 ] is obtained. 4.26 g of this salt are dissolved in 15 ml of acetonitrile and 300 mg of anhydrous magnesium chloride are added. The precipitate of KCl is removed by centrifuging and the supernatant solution is mixed with 15 g of poly(ethylene oxide) with a mass of 9×105 g/mole in 200 ml of acetonitrile. The solution is degassed and cast on a glass plate. After evaporation and drying, a film 70 μm in thickness is obtained, whose conductivity at 80° C. is 2×10-3 (Ω cm)-1.

1. customAfter reaction
2. customthe water is evaporated off at reduced pressure
3. extractionthe solid residue is extracted with 20 ml of methyl formate
4. customAfter evaporation of the organic solution

ORD record

ord-bd4a7e7edf2645ee8a56f3e0baf5e448

Source dataset

uspto-grants-1994_09

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US05350646