Fluorine-containing dielectric media and capacitors employing such media

A dielectric medium containing an effective amount of a compound, or mixtures thereof, having one of the following formulae:

• ##STR4## wherein R.sup.1 is a saturated or unsaturated alkyl or unsubstituted mono- or polyfunctional hydrocarbon radical having 1 to 12 carbon atoms, a cycloalkyl radical having 3 to 12 carbon atoms, an aryl radical having 6 to 12 carbon atoms or an alkaryl radical having 1 to 6 carbon atoms in the alkyl moiety, said radicals substituted with at least two fluorine atoms, R.sup.2 and R.sup.3 are the same or different and independently selected from saturated and unsaturated alkyl or unsubstituted mono- or polyfunctional hydrocarbon radicals having 1 to 12 carbon atoms, cycloalkyl radicals having 3 to 10 carbon atoms, aryl radicals having 6 to 10 carbon atoms or alkaryl radicals having 1 to 6 carbon atoms in the alkyl moiety, R.sup.2 and R.sup.3 may together form the ring of a single cycloalkyl radical having 3 to 10 carbon atom, m, n and o are independently integers of from 1 to 5.