Propanesulfonic acid, 3- -, ethyl ester

These compounds are prepared starting from chloroace-tic acid or its ethyl ester. For chains longer than acetic, cyanoethylation and hydrolysis of the nitrile obtained leads to the propionic chain, alkylation with ethyl 4-bromobuty-rate and saponification leads to the butyric chain. The propanesulfonic chains are particularly accessible by means of ring opening of propane-sultone. 

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)... 

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See also in sourсe #XX -- [ ]

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