Sulfuric Acid → 4-(Trifluoroethenyloxy)hexafluorobutyric acid

Participants

Reaction Steps

(1') An aqueous solution containing 40 g (0.1 mole) of sodium hydroxide dissolved in 160 ml of water was added to 306 g (0.1 mole)of methyl perfluoro(4-vinyloxybutyrate) at 0°-5° C. over 5 hours, and the mixture was returned to room temperature with stirring over 1.5 hours and then left standing for 12 hours. By distilling off water and heating the residue to dryness under reduced pressure, sodium perfluoro(4-vinyloxybutyrate) was quantitatively obtained. 100 g of the sodium salt was suspended in excess amount of concentrated sulfuric acid and the suspension was distilled under reduced pressure, whereby 91.5 g of perfluoro(4-vinyloxybutyric acid) was obtained as a fraction having a boiling point of 80°-81.5° C./20 mmHg (yield:93%). ##STR16##

Provenance & Evidence