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The reaction between the lithium 3-sila-beta-diketiminate (1) and the appropriate MOBut yielded the crystalline sodium (2) or potassium (3) 3-sila-beta-diketiminate in high yield; X-ray crystal data and NMR spectra show new coordination modes for the [N(R)C(Ar)Si(R)C(Ar)N(R)]- ligand (R = SiMe3, Ar = C6H3Me(2)-2,6).

The crystalline compounds [Mg(Br)(L)(thf)].0.5Et2O [L = {N(R)C(C6H3Me2-2,6)}2SiR, R = SiMe3] (1), [Mg(L){N=C=C(C(Me)=CH)2CH2}(D)2] [D = NCC6H3Me2-2,6 (2), thf (3)] and [{Mg(L)}2{mu-OSO(CF3)O-[mu}2] (4) were prepared from (a) Si(Br)(R){C(C6H3Me2-2,6)=NR}2 and Mg for (1), (b) [Mg(SiR3)2(thf)2] and 2,6-Me2C6H3CN (5 mol for (2), 3 mol for (3)), and (c) (2) + Me3SiOS(O)2CF3 for (4); a coproduct from (c) is believed to have been the trimethylsilyl ketenimide Me3SiN=C=C{C(Me)=CH}2CH2 (5).