Saturated palyffuoroalkyl ethers have been prepared by the base-catalyzed addition oi alcohols to polyfluoro olefins. 314, 5 Saturated and unsatuated aryl polyfhoroalkyl ethers have been prepared by the action of alkali metal aryloxides on poIychbropoIyfiumoethanes and propanesfi Park, Sharrah and Lacher'have ob-tained 1, 2-dialkoxy-3, 3, 4, $-tetr~ uorocyclobutenes by what they regard as a metathetical reaction of metal alkoxides and ...