title: From a stable silanone complex to isolable, donor-supported silicoxonium halides [LSi(dmap)=O-SiMe3](+)X-.
abstract: The first donor-stabilized silylated silicoxonium species [LSi=O-SiMe(3)](+) (L=(RN)C(=CH(2))CH=CMe(NR), R=2,6-iPr(2)C(6)H(3)) have been synthesized from the reaction of the dmap-supported (dmap=p-dimethylaminopyridine) silanone complex [LSi(dmap)=O] (1) with trimethylsilyl halides. Although the reaction with Me(3)SiCl leads directly to the Si=O addition product [LSi(Cl)OSiMe(3)] (2), the ionic silicoxonium bromide [L(dmap)Si=O-SiMe(3)](+)Br(-) (3) can be obtained as a primary product of the reaction with Me(3)SiBr, which affords [LSi(Br)OSiMe(3)] (4) with release of the dmap ligand at room temperature in THF. In the case of Me(3)SiI, the reaction furnishes the silicoxonium iodide [L(dmap)Si=O-SiMe(3)](+)I(-) (5) as the most stable species. Compounds 2-5 were isolated and fully characterized through multinuclear NMR spectroscopy, mass spectrometry, elemental analyses, and single-crystal X-ray diffraction analyses.
authors.affiliation: Technische Universität Berlin, Institute of Chemistry, Metalorganic and Inorganic Materials, Sekr. C2, Strasse des 17. Juni 135, 10623 Berlin, Germany.
authors.forename: Yun
authors.initials: Y
authors.lastname: Xiong
authors.forename: Shenglai
authors.initials: S
authors.lastname: Yao
authors.forename: Elisabeth
authors.initials: E
authors.lastname: Irran
authors.forename: Matthias
authors.initials: M
authors.lastname: Driess