The formal [4+1] cycloaddition of the chalcogens S, Se, and Te to the tetrasilabuta‐1,3‐diene 1 furnishes the molecules 2–4, the first five‐membered rings with endocyclic Si−Si double bonds. The new compounds are thermally stable and chemically inert. However, 4 is light‐sensitive and decomposes in daylight with deposition of tellurium. R=2,4,6‐iPr3C6H2.
Durch formale [4+1]‐Addition der Chalkogene S, Se und Te an das Tetrasilabuta‐1,3‐dien 1 entstehen die Verbindungen 2–4 als erste Fünfringe mit endocyclischen Si‐Si‐Doppelbindungen. Alle Verbindungen sind thermisch stabil und chemisch inert; lediglich 4 zersetzt sich an Licht unter Tellurabscheidung. R=2,4,6‐iPr3C6H2.
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