Trifluorothioacetyl fluoride

Another direct route is reaction of tetrafluoroethylene with gaseous sulfur in a hot tube (53). The main product is thiocarbonyl fluoride. Lesser amounts of trifluorothioacetyl fluoride and bis(trifluoromethyl)disulfide are also formed. 

Sulfur also reacts with fluoroalkyl mercurials and fluoroalkyl iodides to give fluorothioacyl halides. In the case of the reaction with mercurials, the halide formed is determined by substitution on the carbon attached to mercury. For example, bis(perfluoroethyl)mercury gives trifluorothioacetyl fluoride and bis-(l,l-dichloro-2,2,2-trifluoroethyl)mereury gives trifluorothioacetyl chloride. 

Copolymerization of fluorothioacyl fluorides with thiocarbonyl fluoride has just been discussed. These compounds also homopolymerize. The procedure used for polymerization of thiocarbonyl fluoride, which is dimethylformamide initiation in ether at — 78° C, is effective for chlorofluorothioacetyl fluoride, difiuorothioacetyl fluoride, trifluorothioacetyl fluoride, chlorodifluorothioacetyl... 

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