| Popis: |
1,4-Dioxan has been fluorinated over cobalt trifluoride and potassium tetrafluorocobaltate (III). In both cases the bulk of the separated products were polyfluoro-1,4-dioxans, the degree of fluorination being greater with cobalt trifluoride. 1,4-Oxathian has been fluorinated over potassium tetrafluorocobaltate (III) to give a complex mixture of products; the major components ( ca. 80 % of the mixture) have been identified, most proved to be polyfluoro-1,4-oxathians. The mechanisms and fluorination pathways of these reactions are discussed, radical, cationic, and radical-cation type intermediates being postulated. None of the products isolated had been rearranged to the 2-methyl-1,3-dioxolan or 2-methyl-1,3-oxathiolan skeletons. |
