Synthetic Explorations Towards Sterically Crowded 1,2,3‐Substituted Bis(indenyl)zirconium( IV ) Dichlorides

Autor:	Tanja Seraidaris, Ole Swang, Richard H. Heyn, Carl-Henrik Görbitz, Richard Blom, Andreas Möller
Rok vydání:	2005
Předmět:	chemistry.chemical_classification Steric effects Zirconium Trimethylsilyl Ligand Stereochemistry chemistry.chemical_element Medicinal chemistry Inorganic Chemistry chemistry.chemical_compound Monomer chemistry Indene Selectivity Alkyl
Zdroj:	European Journal of Inorganic Chemistry. 2005:1759-1769
ISSN:	1099-0682 1434-1948
DOI:	10.1002/ejic.200400972
Popis:	The systematic synthesis of 1,3-dialkyl-substituted 2-silylindenes and their suitability as zirconocene ligands is discussed. Unexpected reactivities rendered a number of substitution patterns unfeasible, especially for alkyl groups other than methyl in 2-(trimethylsilyl)indene derivatives, and essentially for all derivatives of 2-(dimethylsilyl)indene. The syntheses of rac/meso-bis[1-methyl-2-(trimethylsilyl)indenyl]zirconium(IV) dichloride (12) and bis[1,3-dimethyl-2-(trimethylsilyl)indenyl]zirconium(IV) dichloride (13b) are described. The solid-state structure of the latter displays strong deformations within the ligand framework and an unusually large Cpcentroid-Zr–Cpcentroid angle. Both, 12/MAO and 13b/MAO, displayed ethene and ethene-co-1-hexene polymerization activity. Curiously, 13b/MAO shows an extraordinary monomer selectivity, which can be rationalized by means of DFT calculations on the active site. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)
Databáze:	OpenAIRE
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