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

Abstract

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