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Synthesis and reactivity of monomeric magnesium and zinc silyl compounds ToMM–Si(SiHMe2)3 and ToMM–Si(SiMe3)3 are described (ToM = tris(4,4-dimethyl-2-oxazolinyl)phenylborate). The magnesium compounds react slowly with water and air, while the zinc compounds are inert. With CO2, ToMMg–Si(SiHMe2)3 provides ToMMgO2CSi(SiHMe2)3 through CO2 insertion, whereas ToMZn–Si(SiHMe2)3 affords ToMZnOCHO. [ABSTRACT FROM AUTHOR]

The reaction of C2H4 and β-SiH containing azasilazirconacycle Cp2Zr{κ2-N(SiHMe2)SiHMeCH2} (3), formed via a γ-abstraction reaction of Cp2Zr{N(SiHMe2)2}H (1), follows an unusual pathway in which a rare σ-bond metathesis reaction of ethylene generates a vinyl intermediate. That species undergoes a β-hydrogen abstraction under the reaction conditions to form a zirconium silanimine ethylene adduct en route to the metallacyclopentane product. [ABSTRACT FROM AUTHOR]

The new homoleptic rare earth compound [Y(C(SiHMe2)3)3] (2) is prepared in 82% yield by salt metathesis of YCl3 and 3 equivalents of [KC(SiHMe2)3] (1); two α-agostic Y· · ·(H-Si) interactions are observed for each C(SiHMe2)3 ligand in 2, giving six agostic interactions per yttrium(III) center. [ABSTRACT FROM AUTHOR]