Methyl-Substituted Zirconocene−Bis(trimethylsilyl)acetylene Complexes (C5H5-nMen)2Zr(η2-Me3SiC⋮CSiMe3) (n = 2−5)

Methyl-Substituted Zirconocene−Bis(trimethylsilyl)acetylene Complexes (C5H5-nMen)2Zr(η2-Me3SiC⋮CSiMe3) (n = 2−5)
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甲基取代的二茂锆−双(三甲基硅基)乙炔配合物 (C5H5-nMen)2Zr(η2-Me3SiC⋮CSiMe3) (n = 2−5)

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发表时间:
1996
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通讯作者:
K. Mach
K. Mach
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作者:
J. Hiller;U. Thewalt;M. Polášek;Lidmila Petrusová;V. Varga;P. Sedmera;K. Mach

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(C5 H5-nMen)2 Zr [η2-C2(SiMe 3)2](n = 2−5; 1,3-dimethyl,1,2,3-trimethyl)(2C-F)配合物是通过在THF中,在双(三甲基硅基)乙炔(BTMSA)的存在下,用镁还原相应的二氯二茂锆制备的。它们在不存在THF的情况下都是稳定的。(C_5HMe_4)_2Zr [η_2-C_2(SiMe_3)_2](2 E)和(C_5Me_5)_2Zr [η_2-C_2(SiMe_3)_2](2F)以及类似的钛配合物的晶体结构是类质同象的。ν(C <$C)振动的红移和13 C δ(C <$C)的低场位移表明,2C−F中的BTMSA比类似的二茂钛配合物中的配位更强。非孤立的配合物(C5 H4 Me)2 Zr [η2-C2(SiMe 3)2](THF)(2B·THF)在失去THF后重排得到二聚体[(η5-C5 H4 Me)(η1-C(SiMe 3)CH(SiMe 3)Zr(μ-η1:η5-C5 H3 Me)]2(3B)。
The (C5H5-nMen)2Zr[η2-C2(SiMe3)2] (n = 2−5; 1,3-dimethyl, 1,2,3-trimethyl) (2C−F) complexes were prepared by the reduction of corresponding zirconocene dichlorides with magnesium in THF in the presence of bis(trimethylsilyl)acetylene (BTMSA). All of them are stable in the absence of THF. Crystal structures of (C5HMe4)2Zr[η2-C2(SiMe3)2] (2E) and (C5Me5)2Zr[η2-C2(SiMe3)2] (2F) and of the analogous titanium complexes are isomorphous. The red shift of the ν(C⋮C) vibration and the downfield shift of 13C δ(C⋮C) indicate that BTMSA in 2C−F is more strongly coordinated than in analogous titanocene complexes. The nonisolated complex (C5H4Me)2Zr[η2-C2(SiMe3)2](THF) (2B·THF) rearranges after the loss of THF to give the dimer [(η5-C5H4Me)(η1-C(SiMe3)CH(SiMe3)Zr(μ-η1:η5-C5H3Me)]2 (3B).