Yıldız, Cem BurakLeszczyñska, Kinga I.González-Gallardo, SandraZimmer, MichaelAzizoğlu, AkınBiskup, TillKay, ChristopherHüch, VolkerRzepa, Henry S.Scheschkewitz, David2020-09-092020-09-0920201433-7851https:/dx.doi.org/10.1002/anie.202006283https://hdl.handle.net/20.500.12451/7668Yıldız, Cem Burak ( Aksaray, Yazar )Main group analogues of cyclobutane-1,3-diyls are fascinating due to their unique reactivity and electronic properties. So far only heteronuclear examples have been isolated. Here we report the isolation and characterization of all-silicon 1,3-cyclobutanediyls as stable closed-shell singlet species from the reversible reactions of cyclotrisilene c-Si3Tip4 (Tip=2,4,6-triisopropylphenyl) with the N-heterocyclic silylenes c-[(CR2CH2)(NtBu)2]Si: (R=H or methyl) with saturated backbones. At elevated temperatures, tetrasilacyclobutenes are obtained from these equilibrium mixtures. The corresponding reaction with the unsaturated N-heterocyclic silylene c-(CH)2(NtBu)2Si: proceeds directly to the corresponding tetrasilacyclobutene without detection of the assumed 1,3-cyclobutanediyl intermediate.eninfo:eu-repo/semantics/openAccessDiradicaloidsLow-valent SpeciesSiliconSmall RingSynthesisArticle5935150871509210.1002/anie.20200628332407571Q1WOS:000559916900046Q1