The one-pot reaction of the CFC replacement 1,1,1,2-tetrafluoroethane
(CF3CFH2, HFC-134a) with 2 equiv. of butyllithium in diethyl ether at
-78 degrees C followed by the addition of main-group or transition-met
al halides results in good yields of the corresponding metal-perfluoro
vinyl compounds of high purity.