title: Dimerization of a marginally stable disilenyl germylene to tricyclic systems: evidence for reversible NHC-coordination.
abstract: Tetrasiladigermatricyclohexanes in two isomeric forms (chair and doubly-bridged tetrahedron) are obtained by the reaction of MeLi with an α-chlorosilyl functionalized NHC-stabilized silagermenylidene. (29)Si 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.
authors.affiliation: Krupp-Chair of General and Inorganic Chemistry, Saarland University, 66125 Saarbrücken, Germany. scheschkewitz@mx.uni-saarland.de.
authors.forename: David
authors.initials: D
authors.lastname: Nieder
authors.affiliation: Department of Chemistry, Faculty of Science and Letters, Aksaray University, 68100 Aksaray, Turkey.
authors.forename: Cem B
authors.initials: CB
authors.lastname: Yildiz
authors.affiliation: Krupp-Chair of General and Inorganic Chemistry, Saarland University, 66125 Saarbrücken, Germany. scheschkewitz@mx.uni-saarland.de.
authors.forename: Anukul
authors.initials: A
authors.lastname: Jana
authors.affiliation: Krupp-Chair of General and Inorganic Chemistry, Saarland University, 66125 Saarbrücken, Germany. scheschkewitz@mx.uni-saarland.de.
authors.forename: Michael
authors.initials: M
authors.lastname: Zimmer
authors.affiliation: Krupp-Chair of General and Inorganic Chemistry, Saarland University, 66125 Saarbrücken, Germany. scheschkewitz@mx.uni-saarland.de.
authors.forename: Volker
authors.initials: V
authors.lastname: Huch
authors.affiliation: Krupp-Chair of General and Inorganic Chemistry, Saarland University, 66125 Saarbrücken, Germany. scheschkewitz@mx.uni-saarland.de.
authors.forename: David
authors.initials: D
authors.lastname: Scheschkewitz