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Keywords:

  • carbones;
  • density functional calculations;
  • donor–acceptor systems;
  • electronic structure;
  • selenium
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New carbones of the type Ph2E[RIGHTWARDS ARROW]C[LEFTWARDS ARROW]SPh2(NMe) (E=S or Se) were synthesized and characterized. T. Fujii et al. show in their Communication on page 9569 ff. that the double protonation of Ph2Se[RIGHTWARDS ARROW]C[LEFTWARDS ARROW]SPh2(NMe) gives a dication, whereas a C-metalated trication is obtained with silver(I). These reactions constitute the first experimental evidence for a carbodichalcogenurane behaving as a four-electron donor ligand.