Cyclisierungen unter beteiligung von fluoridionen, 3. Mittell. [1,2] teilfluorierte 1.3- und 1.4-dioxane
作者:Guenter Siegemund、Warner Schwertfeger
DOI:10.1016/s0022-1139(00)81237-3
日期:1982.10
Cyclization of 2-(2-chloroethoxy)-perfluorocarboxylic acid halides 3 with alkalimetalfluoride gives 2.3-perfluoro- 1.4-dioxanes 6 with yields up to 84 %. This reaction is also used for the preparation of 4.5.6-perfluoro-1.3- dioxanes 12 starting from 3-chloromethoxyperfluorocarbonyl compounds 11. — The preparation of starting materials is described.
This invention is directed to halodihydrodioxins, their preparation and their polymers, which provide amorphous homopolymers that are resistant to ring opening side reactions. The resulting polymers can be used for films and thermally stable molded objects, coatings for substrates such as wood, glass, paper and metal and for protective packaging. This invention also concerns the preparation of polyhalogenated dioxoles.