This invention relates to a process for preparing 1,3-dioxolanes of formula: ##STR1## wherein; X.sub.1, X.sub.2, X.sub.3 and X.sub.4, like or different from one another, represent F, Cl, Br, I, CF.sub.2 OSO.sub.2 F, SO.sub.2 F, C(O)F, H, perhaloalkyl or oxyperhaloalkyl radicals containing from 1 to 5 carbon atoms, X.sub.5 and X.sub.6, like or different from each other, represent F or CF.sub.3. Said process is characterized in that a bis(fluoroxy)perfluoroalkane is reacted, at a temperature ranging from -140.degree. C. to +60.degree. C., with a halogenated olefin. This invention also relates to new 1,3-dioxolanes of formula (I) belonging to the class defined hereinbefore.
本发明涉及一种制备式为:##STR1##的1,3-二氧杂
环己烷的方法,其中:X.sub.1,X.sub.2,X.sub.3和X.sub.4,彼此相同或不同,代表F、Cl、Br、I、CF.sub.2 OSO.sub.2 F、SO.sub.2 F、C(O)F、H、含有1至5个碳原子的全卤基或氧全卤基基团,X.sub.5和X.sub.6,彼此相同或不同,代表F或CF.sub.3。所述方法的特征在于,在温度范围为-140℃至+60℃的条件下,用卤代烯烃与双(
氟氧基)
全氟烷反应。本发明还涉及属于上述类别的新的式为(I)的1,3-二氧杂
环己烷。