A method for the production of 2,2,3,3 - tetrafluoroethylene-hexafluoropropylene copolymers - 1,4 - benzodioxanes, new o - (2 - bromine - 1,1,2,2 - tetra fluorine ethoxy) - phenols and new 2 - bromine - 1,1,2,2 - tetra fluorine ethoxy - containing groups that are phenyl ether

摘要

process for the production of 2,2,3,3 - tetrafluor - 1.4 - benzodioxanen formula $f1 characterized that compounds of the formula (iv) $f2 with 1.2 - dibrom - 1,1,2,2 - tetrafluoroethane in the presence of a su00e4urebindemittels implements a combination of formula (iii) receives $f3 a ether split subjecta compound of formula (ii) receives $f4, and that in the presence of a su00e4urebindemittels cyclokondensiert. the symbols used in the formulas are in the description of the specified value. in addition, the method (ii) (i), (iii) (ii) and (iv), (iii) and compounds of the formulas (ii) and (iii).