Ethyl pentafluoroisopropenyl ether

Polyfluorovinyl ethers form unstable (i-sultones with sulfur trioxide The p sultones isomerize at 25 °C to give p carbonylsulfonate esters and acids [16, 17 The reaction of sulfur trioxide with ethyl pentafluoroisopropenyl ether to furnish 2-ketopentafluoropropanesulfonic acid and ethyl 2-ketopentafluoro-propanesulfonate is an example (equation 7)... 

Ethyl pentafluoroisopropenyl ether and one equivalent of sulfur trioxide give compound C5H5F504S, which on treatment with 2.5 equivalents of trifluoroacetic acid affords compounds C3HF504S and C4H5F302. What are the compounds shown, and how are they formed ... 

Ethyl pentafluoroisopropenyl ether reacts in its resonance structure with sulfur trioxide in such a way that the sulfur atom of sulfur trioxide becomes attached to the terminal difluoromethylene group. The oxygen atom of sulfur trioxide combines with the methylene carbon of the ethyl group, and thus ethyl 2-oxopentafluoropropane-1 -sulfonate is formed. Its transesterification with trifluoroacetic acid affords 2-oxopentafluoropro-panesulfonic acid and ethyl trifluoroacetate [44],... 

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See also in sourсe #XX -- [ ]

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