title: Facile Access to Stable Silylium Ions Stabilized by N-Heterocyclic Imines.
abstract: Novel silylium ions with N-heterocyclic imines were successfully synthesized. The reaction of trimethylsilyl imidazolin-2-imine Me₃SiNIPr (NIPr = bis(2,6-diisopropylphenyl)-imidazolin-2-imino) with B(C₆F₅)₃ leads to dimeric imino-substituted silylium ions through a methyl group abstraction on the silicon atom. Meanwhile, the intermolecular imino-coordinated silylium ion is formed by using the less sterically crowded imine Me₃SiNItBu (NItBu = bis(tert-butyl)-imidazolin-2-imino). Furthermore, the treatment of dimethylchlorosilane Me₂(Cl)SiNIPr with AgOTf affords the contact ion pair Me₂(OTf)SiNIPr by substitution of the chloride. A novel complex with the formula [Me₂(DMAP)SiNIPr][OTf] was prepared by coordination with 4-dimethylamino-pyridine (DMAP). In the solid state, the DMAP adduct [Me₂(DMAP)SiNIPr][OTf] contains a distinct [Me₂(DMAP)SiNIPr]⁺ moiety.
authors: Institut für Chemie, Technische Universität Berlin, Straße des 17. Juni 135, Sekr. C2, 10623 Berlin, Germany. tatsumi.ochiai@mailbox.tu-berlin.de.
authors: Tatsumi
authors: T
authors: Ochiai
authors: Department of Inorganic and Analytical Chemistry, Budapest University of Technology and Economics, Szent Gellért tér 4, 1111 Budapest, Hungary. szilvasitibor@ch.bme.hu.
authors: Tibor
authors: T
authors: Szilvási
authors: Institut für Chemie, Technische Universität Berlin, Straße des 17. Juni 135, Sekr. C2, 10623 Berlin, Germany. s.inoue@tum.de.|Department of Chemistry, Catalysis Research Center and Institute of Silicon Chemistry, Technische Universität München, Lichtenbergstraße 4, 85748 Garching, Germany. s.inoue@tum.de.
authors: Shigeyoshi
authors: S
authors: Inoue
mesh_terms: D006571:Heterocyclic Compounds / Q000737:chemistry*; D007097:Imines / Q000737:chemistry*; D017646:Organosilicon Compounds / Q000737:chemistry*
chemical_list: D006571:Heterocyclic Compounds; D007097:Imines; D017646:Organosilicon Compounds
keywords: borate; cation; imine; silicon; silylium