Reactions of the Hexafluorothioacetone Dimer with Cyanides of Phosphorus, Arsenic and Germanium

Cyanides such as P(CN) , As(CN) , PhP(CN) , Bu As(CN) and Ge(CN) react with [(CF CS] (1) by insertion of the carbon atom of the iso-nitrile isomer into the four-membered [CS] ring to give compounds PR′ (2), AsR′ (3), FP(S)R′ (4), PhP(S)R′2 (5), Bu AsR′ (6) and GeR′ (7) respectively, where R′ is the novel heterocyclic ligand[xxx]. The crystal structures of 3 and 7 are reported.