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ansa-metallocene derivatives : XVII. Racemic and meso diastereomers of group IV metallocene derivatives with symmetrically substituted, dimethylsilanediyl-bridged ligand frameworks. Crystal structure of R,S-Me2Si(3-t-Bu-5-MeC5H2)2ZrCl2

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1989

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Wiesenfeldt, Helga
Reinmuth, Annette
Barsties, Elke
Evertz, Kaspar

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Journal of Organometallic Chemistry. 1989, 369(3), pp. 359-370. ISSN 0022-328X. eISSN 1872-8561. Available under: doi: 10.1016/0022-328X(89)85186-1

Zusammenfassung

The formation of racemic and meso diastereomers of the disubstituted ansa-zirconocenes (CH3)2Si(1-C5H3-3-R)2ZrCl2 (R = t-butyl, trimethylsilyl, α,α-dimethylbenzyl and 1-phenylcyclohexyl) from dimethylsilanediyl-bridged, symmetrically substituted bis-cyclopentadienyl dianion derivatives and ZrCl4·2THF has been studied under a variety of conditions. Rac/meso ratios close to 1 were obtained in all cases. Similar product ratios were observed for analogous titanium and hafnium complexes with R = trimethylsilyl. A significant increase in the rac/meso product ratio was observed when an additional substituent was present next to the dimethylsilyl bridge as in (CH3)2Si(1-C5H2-3-R-5-CH3)2ZrCl2 (R = CH(CH3)2, C(CH3)3). It is suggested that intermediates with one η1-bound ring ligand control the stereochemical course of the ansa-metallocene formation. The crystal structure of R,S-(CH3)2Si(1-C5H2-3-C(CH3)3-5-CH3)2ZrCl2 is reported.

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540 Chemie

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ISO 690WIESENFELDT, Helga, Annette REINMUTH, Elke BARSTIES, Kaspar EVERTZ, Hans-Herbert BRINTZINGER, 1989. ansa-metallocene derivatives : XVII. Racemic and meso diastereomers of group IV metallocene derivatives with symmetrically substituted, dimethylsilanediyl-bridged ligand frameworks. Crystal structure of R,S-Me2Si(3-t-Bu-5-MeC5H2)2ZrCl2. In: Journal of Organometallic Chemistry. 1989, 369(3), pp. 359-370. ISSN 0022-328X. eISSN 1872-8561. Available under: doi: 10.1016/0022-328X(89)85186-1
BibTex
@article{Wiesenfeldt1989ansam-23958,
  year={1989},
  doi={10.1016/0022-328X(89)85186-1},
  title={ansa-metallocene derivatives : XVII. Racemic and meso diastereomers of group IV metallocene derivatives with symmetrically substituted, dimethylsilanediyl-bridged ligand frameworks. Crystal structure of R,S-Me<sub>2</sub>Si(3-t-Bu-5-MeC<sub>5</sub>H<sub>2</sub>)<sub>2</sub>ZrCl<sub>2</sub>},
  number={3},
  volume={369},
  issn={0022-328X},
  journal={Journal of Organometallic Chemistry},
  pages={359--370},
  author={Wiesenfeldt, Helga and Reinmuth, Annette and Barsties, Elke and Evertz, Kaspar and Brintzinger, Hans-Herbert}
}
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