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Issue 12, 2000
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Structural characterization of M(s-cis4-C4H6)(Me4C5SiMe2NR) (M = Ti or Zr, R = CMe3 or CHCMe(1-C10H7)

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Abstract

Treatment of M(Me4C5SiMe2NR)Cl2 [M = Zr, R = CMe3 or CHMe(1-C10H7): M = Ti, R = CMe3] with “butadienemagnesium” gave the respective M(s-cis4-C4H6)(Me4C5SiMe2NR) complexes in good yield. In solution, the parent zirconium system Zr(s-cis4-C4H6)(Me4C5SiMe2NCMe3) forms a 85∶15 equilibrium mixture of the supine (A) and prone (B) isomers, whereas the isomer which has the s-cis-butadiene ligand oriented with its open side toward the amido group (prone) is favored in the Ti(s-cis4-C4H6)(Me4C5SiMe2NCMe3) case (AB = 5∶95). Complex Zr[s-cis4-C4H6){Me4C4SiMe2NCHMe(1-C10H7)] was obtained as a single isomer (supine orientation A favored). The favored isomers were in each case characterized by single crystal X-ray structure analyses. The zirconium complexes contain a central metallacyclic σ2,π-type (s-cis4-butadiene) metal framework, whereas the titanium structure is more like that expected for a conventional π-butadiene metal complex.

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Publication details

The article was received on 20 Jan 2000, accepted on 14 Apr 2000 and first published on 26 May 2000


Article type: Paper
DOI: 10.1039/B000570N
Citation: J. Chem. Soc., Dalton Trans., 2000,0, 1881-1886
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    Structural characterization of M(s-cis4-C4H6)(Me4C5SiMe2NR) (M = Ti or Zr, R = CMe3 or CHCMe(1-C10H7)

    M. Dahlmann, J. Schottek, R. Fröhlich, D. Kunz, M. Nissinen, G. Erker, G. Fink and R. Kleinschmidt, J. Chem. Soc., Dalton Trans., 2000, 0, 1881
    DOI: 10.1039/B000570N

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