Synthesis and characterisation of tellurium-containing chalcogen–nitrogen heterocycles

Abstract

Cl₆Te₂N₂S and Cl₂Br₄Te₂N₂S are prepared by oxidation of Cl₂[graphic omitted]e with Cl₂ or Br₂, respectively; reduction of Cl₂Br₄Te₂N₂S with Ph₃Sb gives Br₂[graphic omitted]e, which on treatment with AgAsF₆ in liquid SO₂ forms [Br[graphic omitted]e]⁺[AsF₆]^–; bromination of Br₂[graphic omitted]e yields the corresponding Br₆Te₂N₂S; attempts to prepare a dicationic five-membered ring system starting from Cl₂[graphic omitted]e gives the first Te containing dioationic eight-membered chalcogen–nitrogen system [[graphic omitted]]²⁺[AsF₆^–]₂; reaction of C₁₆Te₂N₂S with Me₃SiNSNSiMe₃ leads to Cl₄Te₂S₂N₄.