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Keywords:

  • aromatic systems;
  • cyclobutadiene;
  • N ligands;
  • silicon;
  • sulfur
Thumbnail image of graphical abstract

The tetrasilacyclobutadiene [LSi(μ-SiL′)2SiL] (L=PhC(NtBu)2, L′=2,6-iPr2C6H3NSiMe3) consists of an aromatic silicon-containing four-membered ring in which two π, two σ, and two lone-pair electrons are cyclically delocalized. The electron delocalization was illustrated by theoretical studies and reactivity with elemental sulfur to form the allylic zwitterionic cyclic compound [(LSi)2(μ-SiL′)(μ-Si(S)L′)] with 2π-electron delocalization along the Si3 skeleton.