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Shu-Hua Zhang, Dr. Hong-Wei Xi, Prof. Dr. Kok Hwa Lim and Dr. Cheuk-Wai So An Extensive n, π, σ-Electron Delocalized Si4 Ring Angewandte Chemie International Edition 52

Version of Record online: 2 OCT 2013 | DOI: 10.1002/anie.201305567

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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.

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