FIELD: chemical technology.
SUBSTANCE: invention relates to a method for preparing 5-trifluoromethyl-3,6-dioxa-8-sulfonylfluoroperfluorooctene. Method involves contacting 2,5-di-(trifluoromethyl)-3,6-dioxa-8-sulfonylfluoroperfluorooctanoyl fluoride with sodium carbonate suspension in diglyme to yield 2,5-di-(trifluoromethyl)-3,6-dioxa-8-sulfonylfluoroperfluorooctanoic acid sodium salt followed by pyrolysis of abovementioned salt at increased temperature to yield 5-trifluoromethyl-3,6-dioxa-8-sulfonylfluoroperfluorooctene and isolating the latter from the reaction zone by distillation off. Method involves preliminary contacting sodium carbonate suspension in diglyme with perfluoro-(2-propoxypropionyl)-fluoride to yield perfluoro-2-propoxypropionic acid sodium salt that is subjected for pyrolysis at temperature 140°C to yield perfluoropropylvinyl ester that is distilled off from the reaction zone.
EFFECT: improved preparing method.
1 tbl, 5 ex
| Title | Year | Author | Number |
|---|---|---|---|
| METHOD FOR PRODUCING 5-TRIFLUOROMETHYL-3,6-DIOXA-8-PERFLUOROCTENE SULPHONYL FLUORIDE | 2010 |
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SU438646A1 |
