Coordination of a SiO subunit to metals: complexes of donor-stabilized silanone featuring a terminal SiO→M coordination (M = Zn, Al)

Abstract

The striking reactivity of donor-stabilised silanone LSi(DMAP)O (1) [L = N(Ar)C(CH₂)CHC(Me)N(Ar), Ar = 2,6-iPr₂C₆H₃, DMAP = p-dimethylaminopyridine] toward Lewis acidic metal substrates Zn(OAc)₂, ZnMe₂, and AlMe₃ is reported. Two unprecedented addition products onto the SiO double bond, [LSi(OAc)(μ-O)Zn(OAc)(DMAP)₂] (2) and [LSi(OAc)(μ-O)]₂Zn(DMAP) (3), and two terminal complexes LSi(DMAP)O→ZnMe₂ (4) and LSi(DMAP)O→AlMe₃ (5) were obtained. Compounds 4 and 5 are unique, representing the first isolable and structurally characterised terminal SiO→Zn and SiO→Al complexes. All new compounds were fully characterised by ¹H, ¹³C, and ²⁹Si NMR spectroscopy, EI-MS, elemental analysis and single-crystal X-ray diffraction analyses.