title: An amplified Ylidic "half-parent" iminosilane LSi═NH.
abstract: The reaction of LSiBr(NH2) (4) (L = CH[(C═CH2)CMe(NAr)2]; Ar = 2,6-iPr2C6H3) with lithium bis(trimethylsilyl)amide in the presence of pyridine or 4-dimethylaminopyridine (DMAP) resulted in the activation of the α C-H bond of pyridine or DMAP, affording the products LSi(dmap)NH2 (6) and LSi(pyridine)NH2 (7a), respectively. Remarkably, this metal-free aromatic C-H activation occurs at room temperature. The emerging aminosilanes were isolated and fully characterized. Isotope labeling experiments and detailed DFT calculations, elucidating the reaction mechanism, were performed and provide compelling evidence of the formation of the "half-parent" iminosilane 1, LSi═NH, which facilitates this transformation due to its amplified ylidic character by the chelate ligand L. Furthermore, the elusive iminosilane 1 could be trapped by benzophenone and trimethylsilylazide affording the corresponding products, 8 and 9, respectively, thereby confirming its formation as a key intermediate.
authors.affiliation: Metalorganics and Inorganic Materials, Department of Chemistry, Technische Universität Berlin , Straße des 17. Juni 135, Sekr. C2, 10623 Berlin, Germany.
authors.forename: Kerstin
authors.initials: K
authors.lastname: Hansen
authors.forename: Tibor
authors.initials: T
authors.lastname: Szilvási
authors.forename: Burgert
authors.initials: B
authors.lastname: Blom
authors.forename: Matthias
authors.initials: M
authors.lastname: Driess