Nieder, DavidYıldız, Cem BurakJana, AnukulZimmer, MichaelHuch, VolkerScheschkewitz, David13.07.20192019-07-2913.07.20192019-07-2920161359-73451364-548Xhttps://doi.org/10.1039/c5cc09878ehttps://hdl.handle.net/20.500.12451/5770Tetrasiladigermatricyclohexanes in two isomeric forms (chair and doubly-bridged tetrahedron) are obtained by the reaction of MeLi with an alpha-chlorosilyl functionalized NHC-stabilized silagermenylidene. Si-29 NMR at low temperature proves the initial formation of a monomeric NHC-adduct of a disilenyl germylene followed by cyclisation to the isomeric heavy cyclopropene. Addition of an excess of NHC stabilizes the both intermediates and demonstrates the reversibility of rate-determining initial equilibria involving NHC dissociation. Finally, a mixture of two isomeric tricyclic Si4Ge2 species is obtained: at elevated temperature the chair isomer converts to the doubly edge-bridged tetrahedron.eninfo:eu-repo/semantics/openAccessArticle52132799280210.1039/c5cc09878e26771028Q1WOS:000369642800033N/A