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• W2053305138 abstract "Thermal treatment of Nb(η5-C5H4SiMe3)2(H)3 (1) with the appropriate organogermanium hydrides (HGeR3) and HSnPh3 gives the corresponding niobocene germyl hydrides Nb(η5-C5H4SiMe3)2(H)2(GeR3), GeR3GePh3 (2), GePh2H (3), GeEt3 (4), Ge(C6H13)3 (5), GeiAm3 (iAm = CH2CH2CH(CH3)2) (6), Ge(C6H13)2Cl (7), GeiAm2Cl (8), Ge(C6H13)2H (9), GeiAm2H (10), and Nb(η5-C5H4SiMe3)2(H)2(SnPh3) (11) in good yields. Spectroscopic data indicate the presence of only one of the two possible structural isomers in which the germyl or stannyl group is in the equatorial plane with a symmetrical structure. Reactivity studies on the series Nb(η5-C5H4SiMe3)2(H)2(ER3), E = Si (12), Ge (2), Sn (11), were carried out. 12 reacts with H2 to give 1, but 2 and 11 were unreactive toward this reagent. Furthermore, a similar behavior was observed with CO and CN(2,6-Me2C6H3). Thus, 12 reacts with these reagents to give rise, after elimination of HSiPh3, to Nb(η5-C5H4SiMe3)2(H)(CO) and Nb(η5-C5H4SiMe3)2(H)(CN(2,6-Me2C6H3)), respectively, while 2 and 11 do not react. Reactions of 12 with HGePh3 and HSnPh3 and of 2 with HSnPh3 gave σ-bond metathesis products, but no reactions were observed between 2 and HSiPh3 or between 11 and HSiPh3 or 11 and HGePh3. The kinetics of these processes have been studied by 1H NMR spectroscopy and indicated the following reactivity trends Nb−SiPh3 > Nb−GePh3 > Nb−SnPh3 for the different processes considered. The X-ray molecular structures of 2 and 11 were established by diffraction studies. The two isostructural complexes show a bent-sandwich coordination with the two hydrides flanking either side of the Nb−Ge and Nb−Sn bonds (2.710(1), 2.830(1) Å in 2 and 11, respectively)." @default.
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• W2053305138 date "1998-03-15" @default.
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• W2053305138 title "Synthesis and Characterization of the First Niobocene Germyl Complexes and Reactivity of Triphenylsilyl-, Triphenylgermyl-, and Triphenylstannylniobocene Derivatives. X-ray Molecular Structures of d⁰ Nb(η⁵-C₅H₄SiMe₃)₂(H)₂(EPh₃) (E = Ge, Sn)" @default.
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• W2053305138 doi "https://doi.org/10.1021/om971001b" @default.
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