(CH3) 2AsSC2H5, prepared from (CH3) 2AsCl and Pb (SC2H5) 2, and ((CH3) 2As) 2S2 react with RfI at 100° to give the compounds (CH3) 2AsRf (Rf= CF3, C3F7). The compounds AS2S x (x= 2, 3) do not react with CF3I at 100°.((CF3) 2As) 2S, prepared from (CF3) 2AsI and Ag2S or from (CF3) 2AsH and S, reacts with Hg to give ((CF3) 2As) 2, decomposes at 175° to give (CF3) 3As, and reacts with CF3I at 125° to give mainly (CF3) 3As. Some (CF3 ...
