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rac-Me 2 Si(2-Me-4-t-Bu-C 5 H 2) 2 ZrMe + : an alkyl zirconocenium cation stabilized by steric shielding against interaction with ancillary ligands

rac-Me 2 Si(2-Me-4-t-Bu-C 5 H 2) 2 ZrMe + : an alkyl zirconocenium cation stabilized by steric shielding against interaction with ancillary ligands

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SCHRÖDER, Lars, Hans-Herbert BRINTZINGER, Dmitrii E. BABUSHKIN, David FISCHER, Rolf MÜLHAUPT, 2005. rac-Me 2 Si(2-Me-4-t-Bu-C 5 H 2) 2 ZrMe + : an alkyl zirconocenium cation stabilized by steric shielding against interaction with ancillary ligands. In: Organometallics. 24(5), pp. 867-871. ISSN 0276-7333. eISSN 1520-6041. Available under: doi: 10.1021/om049139z

@article{Schroder2005racMe-23720, title={rac-Me 2 Si(2-Me-4-t-Bu-C 5 H 2) 2 ZrMe + : an alkyl zirconocenium cation stabilized by steric shielding against interaction with ancillary ligands}, year={2005}, doi={10.1021/om049139z}, number={5}, volume={24}, issn={0276-7333}, journal={Organometallics}, pages={867--871}, author={Schröder, Lars and Brintzinger, Hans-Herbert and Babushkin, Dmitrii E. and Fischer, David and Mülhaupt, Rolf} }

Babushkin, Dmitrii E. Fischer, David Babushkin, Dmitrii E. Mülhaupt, Rolf terms-of-use Fischer, David eng 2005 rac-Me 2 Si(2-Me-4-t-Bu-C 5 H 2) 2 ZrMe + : an alkyl zirconocenium cation stabilized by steric shielding against interaction with ancillary ligands Schröder, Lars 2013-06-24T16:27:32Z Mülhaupt, Rolf 2013-06-24T16:27:32Z The sterically shielded cation rac-Me<sub>2</sub>Si(2-Me-4-t-Bu-C<sub>5</sub>H<sub>2</sub>)<sub>2</sub>ZrMe<sup>+</sup>, generated by reaction of rac-Me<sub>2</sub>Si(2-Me-4-t-Bu-C<sub>5</sub>H<sub>2</sub>)<sub>2</sub>ZrMe<sub>2</sub> with methylalumoxane (MAO) or with dimethylanilinium or trityl perfluorotetraphenylborate, differs from other, more open zirconocene methyl cations in that it does not form the symmetric AlMe<sub>3</sub> adduct rac-Me<sub>2</sub>Si(2-Me-4-t-Bu-C<sub>5</sub>H<sub>2</sub>)<sub>2</sub>Zr(μ-Me)<sub>2</sub>AlMe<sub>2</sub><sup>+</sup>. Instead, the unsymmetric ternary adduct rac-Me<sub>2</sub>Si(2-Me-4-t-Bu-C<sub>5</sub>H<sub>2</sub>)<sub>2</sub>ZrMe(μ-Me)AlMe<sub>3</sub>−NMe<sub>2</sub>Ph<sup>+</sup> is formed in the presence of dimethylaniline and trimethylaluminum. UV/vis and <sup>1</sup>H NMR characteristics of hydrocarbon solutions containing rac-Me<sub>2</sub>Si(2-Me-4-t-Bu-C<sub>5</sub>H<sub>2</sub>)<sub>2</sub>ZrMe<sup>+</sup>***B(C<sub>6</sub>F<sub>5</sub>)4- or rac-Me<sub>2</sub>Si(2-Me-4-t-Bu-C<sub>5</sub>H<sub>2</sub>)<sub>2</sub>ZrMe<sup>+</sup>***MAOMe<sup>-</sup> indicate that cation−anion association in these ion pairs is unusually weak. Brintzinger, Hans-Herbert Schröder, Lars Organometallics ; 24 (2005), 5. - S. 867-871 Brintzinger, Hans-Herbert

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