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Activation of metallocene hydride intermediates by methylaluminoxane in alkene dimerization and oligomerizationстатья
Дата последнего поиска статьи во внешних источниках: 15 февраля 2024 г.
- Авторы: Parfenova Lyudmila V., Kovyazin Pavel V., Bikmeeva Almira Kh, Palatov Eldar R., Ivchenko Pavel V., Nifant’ev Ilya E.
- Журнал: Reaction Kinetics, Mechanisms and Catalysis
- Том: 137
- Номер: 1
- Год издания: 2023
- Издательство: Akademiai Kiado
- Местоположение издательства: Hungary
- Первая страница: 269
- Последняя страница: 286
- DOI: 10.1007/s11144-023-02540-7
- Аннотация: In order to elucidate the dependence of the structure and reactivity of the bimetallic hydride intermediates formed in the systems metallocene—organoaluminum compound—activator on the nature of the transition metal atom and ligand environment, we used NMR spectroscopy to study reactions of a series of L2MCl2 complexes (M = Hf, Zr; L2 = Cp2, (CpMe)2, ansa-(Me2C)2Cp2, ansa-Me2CInd2) with HAlBui2 and MMAO-12 activator. As a result, M, Al-bimetallic intermediates containing [L2MH3] and [(L2M)2H3] type moieties were detected for both hafnium and zirconium complexes with cyclopentadienyl ligands. The [L2ZrH3] type structure predominates in the system based on the ansa-bis-indenyl zirconium complex. The detected complexes provide associates with MMAO-12 [L2MH3]·MAO and [(L2M)2H3]·MAO. The MAO-associated intermediates of the [(L2M)2H3] type are precursors of the catalytically active sites for alkene dimerization. In the system based on ansa-bis-indenyl zirconium complex, the intermediate of the [L2MH3] type affords a set of hydride structures, presumably cationic, which lead to alkene oligomerization.
- Добавил в систему: Ивченко Павел Васильевич