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    Equilibrium Formation of Stable All-Silicon Versions of 1,3-Cyclobutanediyl
    (Wiley-VCH Verlag, 2020) Yıldız, Cem Burak; Leszczyñska, Kinga I.; González-Gallardo, Sandra; Zimmer, Michael; Azizoğlu, Akın; Biskup, Till; Kay, Christopher; Hüch, Volker; Rzepa, Henry S.; Scheschkewitz, David
    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.