Publication: Formation of cyclodimeric (sp(2)-C(1))-bridged Cp/-oxido ("CpC(1)O"M(IV)X(2)) group 4 metal Ziegler-Natta catalyst systems--how important is the "constrained geometry" effect?
Formation of cyclodimeric (sp(2)-C(1))-bridged Cp/-oxido ("CpC(1)O"M(IV)X(2)) group 4 metal Ziegler-Natta catalyst systems--how important is the "constrained geometry" effect?
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Kunz, K., Erker, G., Kehr, G., Fröhlich, R., Jacobsen, H., Berke, H., & Blacque, O. (2002). Formation of cyclodimeric (sp(2)-C(1))-bridged Cp/-oxido (“CpC(1)O”M(IV)X(2)) group 4 metal Ziegler-Natta catalyst systems--how important is the “constrained geometry” effect? Journal of the American Chemical Society, 124, 3316–3326. https://doi.org/10.1021/ja010943b
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Deprotonation of sodium acetylcyclopentadienide (11) was achieved by treatment with LDA in THF to generate the dianion equivalent Cp-C(=CH(2))-O(12). Transmetalation with Cl(2)Ti(NMe(2))(2) gave ([Cp-C(=CH(2))-O]Ti(NMe(2))(2))(2) (17); treatment of 12 with Cl(2)Zr(NEt(2))(2)(THF)(2) furnished (([Cp-C(=CH(2))-O]Zr(NEt(2))(2))(2) (18). Cryoscopy in benzene revealed a dimeric structure of 18 in solution. Complex 18 was characterized further by an X-ray crystal structure analysis and by DFT calculations. The two zirconium centers of
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- Kunz, K
- Erker, G
- Kehr, G
- Fröhlich, R
- Jacobsen, H
- Berke, Heinz
- Blacque, Olivier
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Kunz, K., Erker, G., Kehr, G., Fröhlich, R., Jacobsen, H., Berke, H., & Blacque, O. (2002). Formation of cyclodimeric (sp(2)-C(1))-bridged Cp/-oxido (“CpC(1)O”M(IV)X(2)) group 4 metal Ziegler-Natta catalyst systems--how important is the “constrained geometry” effect? Journal of the American Chemical Society, 124, 3316–3326. https://doi.org/10.1021/ja010943b