Facile Access to the Functionalized N-Donor Stabilized Silylenes PhC(NtBu)2SiX (X = PPh2, NPh2, NCy2, NiPr2, NMe2, N(SiMe3)2, OtBu)
journal contributionposted on 25.06.2012, 00:00 authored by Ramachandran Azhakar, Rajendra S. Ghadwal, Herbert W. Roesky, Hilke Wolf, Dietmar Stalke
Reactions of silylenes with organic substrates generally lead to silicon(IV) compounds. Ligand substitution at the silicon(II) atom of silylene, without changing the formal +2 oxidation state, is very rare. We report herein a straightforward route to functionalized silylenes LSiX (L = PhC(NtBu)2 and X = PPh2 (1), NPh2 (2), NCy2(3), NiPr2 (4), NMe2 (5), N(SiMe3)2 (6), OtBu (7)). Silylenes 1–7 have been prepared in quantitative yield by a modified ligand exchange reaction of PhC(NtBu)2SiCl (LSiCl) with the corresponding lithium or potassium salts. Compounds 1–7 were characterized by spectroscopic and spectrometric techniques. Single-crystal X-ray structures of 1, 3, and 4 were determined.