The present invention provides a process for producing a fluorinated fluorosulfonylalkyl vinyl ether represented by general formula (2):

CF2CFO(CF2CF(CF3)O)nCF2CF2SO2F  (2)

wherein n is an integer from 0 to 10, comprising fluorinating a perfluorovinylether sulfonate with SF4 and HF, the perfluorovinylether sulfonate being represented by general formula (1):

CF2CFO(CF2CF(CF3)O)nCF2CF2SO3M  (1)

wherein M is Ma or Mb1/2, provided that Ma is an alkali metal and Mb is an alkaline earth metal; and n is as defined above. According to the process of the invention, the fluorinated fluorosulfonylalkyl vinyl ether can be produced in high yield in an industrially advantageous manner.

 
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