Hexafluoropropylene → 1,2-Oxathietane, 3,4,4-trifluoro-3-(trifluoromethyl)-, 2,2-dioxide

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A mixture of commercial liquid sulfur trioxide (10 ml) and hexafluoropropene (45 g, 0.30 mol) was sealed in a Carius tube at liquid nitrogen temperature, mixed well at 25° C., allowed to stand for 4 days at 25° C., and finally heated in a steam bath for 6 hours. From two such tubes, there was obtained by distillation, 3-(trifluoromethyl)-3,4,4-trifluoro-1-oxa-2-thiacyclobutane 2,2-dioxide (2-hydroxy-1-trifluoromethyl-1,2,2-trifluoroethane sulfonic acid sultone, D. C. England, M. A. Dietrich and R. V. Lindsey, Jr., J. Amer. Chem. Soc., 82, 6181 (1960)) (25 g, 22%) bp 44° C., and pentafluoro-2-propenyl fluorosulfate (hereinafter referred to as perfluoroallyl fluorosulfate) (73 g, 63%), bp 58°-60° C.

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