Conclusions
-
1.
Hexafluorobutadiene and sulfur trioxide do not form the Diels-Alder adducts. The primary reaction product is 4-(trifluorovinyl)-3,3,4-trifluoro-1-oxa-2-thiacyclobutane 2,2-dioxide (a 3-sultone).
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2.
When stored or heated the β-sultone undergoes retrocycloaddition and isomerization to a 6-sultone and a linear 1,4-copolymer of hexafluorobutadiene and SO3 (1:1).
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3.
The oxidation-reduction reaction of the β-sultone with SO3 forms 4-(trifluorovinyl)-4,5,5-trifluoro-1,3-dioxa-2-thiacyclopentane 2,2-dioxide (a β-sulfate), the corresponding polyperfluoropyrosulfate, and SO2.
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4.
The β-sulfate is thermally isomerized to δ -sulfate (4,4,5,6,7,7-hexafluoro-1,3-dioxa-2-thia-5-cycloheptene 2,2-dioxide).
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 1, pp. 118–126, January, 1979.
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Kaz'mina, N.B., Knunyants, I.L., Kuz'yants, G.M. et al. Reaction of hexafluorobutadiene with sulfur trioxide. Russ Chem Bull 28, 106–114 (1979). https://doi.org/10.1007/BF00925407
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DOI: https://doi.org/10.1007/BF00925407