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Distinct methylalumoxane(MAO)-derived Me–MAO<sup>−</sup> anions in contact with a zirconocenium cation—a <sup>13</sup>C-NMR study

Distinct methylalumoxane(MAO)-derived Me–MAO anions in contact with a zirconocenium cation—a 13C-NMR study

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Prüfsumme: MD5:c690018f96bdab5495f94bd2d9c204f4

BABUSHKIN, Dmitrii E., Corinna NAUNDORF, Hans-Herbert BRINTZINGER, 2006. Distinct methylalumoxane(MAO)-derived Me–MAO anions in contact with a zirconocenium cation—a 13C-NMR study. In: Dalton Transactions(38), pp. 4539-4544. ISSN 1477-9226. eISSN 1477-9234

@article{Babushkin2006-10-14Disti-23673, title={Distinct methylalumoxane(MAO)-derived Me–MAO anions in contact with a zirconocenium cation—a 13C-NMR study}, year={2006}, doi={10.1039/B611028M}, number={38}, issn={1477-9226}, journal={Dalton Transactions}, pages={4539--4544}, author={Babushkin, Dmitrii E. and Naundorf, Corinna and Brintzinger, Hans-Herbert} }

2013-07-24T19:04:08Z 2006-10-14 Zirconocenium cations of the type [(MeC<sub>5</sub>H<sub>4</sub>)<sub>2</sub>ZrMe]<sup>+</sup>, formed by excess methylalumoxane (MAO) from (MeC<sub>5</sub>H<sub>4</sub>)<sub>2</sub>ZrCl<sub>2</sub> or (MeC<sub>5</sub>H<sub>4</sub>)<sub>2</sub>ZrMe<sub>2</sub> with <sup>13</sup>C-labelled ring ligands, are found to form ion pairs with two types of anions, Me–MAO<sub>A</sub><sup>−</sup> and Me–MAO<sub>B</sub><sup>−</sup>, which differ in their coordinative strengths: More strongly coherent ion pairs [(MeC<sub>5</sub>H<sub>4</sub>)<sub>2</sub>ZrMe<sup>+</sup>***Me–MAO<sub>B</sub><sup>−</sup>] are converted to more easily separable ion pairs [(MeC<sub>5</sub>H<sub>4</sub>)<sub>2</sub>ZrMe<sup>+</sup>***Me–MAO<sub>A</sub><sup>−</sup>] by a sufficient excess of MAO. These react with Al<sub>2</sub>Me<sub>6</sub> to form outer-sphere ion pairs containing the cationic AlMe<sub>3</sub> adduct [(MeC<sub>5</sub>H<sub>4</sub>)<sub>2</sub>Zr(µ-Me)<sub>2</sub>AlMe<sub>2</sub>]<sup>+</sup>; formation of the more easily separable ion pairs might be required also for polymerisation catalysis. Naundorf, Corinna Brintzinger, Hans-Herbert Brintzinger, Hans-Herbert eng Distinct methylalumoxane(MAO)-derived Me–MAO<sup>−</sup> anions in contact with a zirconocenium cation—a <sup>13</sup>C-NMR study Babushkin, Dmitrii E. Naundorf, Corinna deposit-license 2013-07-24T19:04:08Z Babushkin, Dmitrii E. Dalton Transactions ; (2006), 38. - S. 4539-4544

Dateiabrufe seit 01.10.2014 (Informationen über die Zugriffsstatistik)

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