Titanium and Zirconium Complexes for Polymerization of Propylene and Cyclic Esters

Autor:	Moris S. Eisen, Moshe Kapon, Florina Gornshtein, and Mark Botoshansky
Rok vydání:	2006
Předmět:	chemistry.chemical_classification Zirconium Organic Chemistry chemistry.chemical_element Polymer Metathesis Catalysis Inorganic Chemistry chemistry Polymerization Intramolecular force Polymer chemistry Organic chemistry Physical and Theoretical Chemistry Enantiomer Titanium
Zdroj:	Organometallics. 26:497-507
ISSN:	1520-6041 0276-7333
DOI:	10.1021/om060723c
Popis:	The new group IV complexes ((CH3)3CCOCHCONEt2)2Ti(OMe)2 (3), ((CH3)3CCOCHCONMe2)2Ti(OMe)2 (4), (CH3COCHCONMe2)2Ti(OC(CH3)3)2 (5), and ((CH3)3CCOCHCONEt2)2ZrCl2 (6) were synthesized and characterized. The titanium dialkoxide complexes 3−5 were produced during the attempts to synthesize the corresponding titanium diamido complexes via an intramolecular metathesis. A mechanism for the intramolecular metathesis is presented. Complexes 3 and 4 exhibit dynamic behavior in solution as a function of temperature. This dynamic behavior is due to a disconnection and recoordination of the β-ketoamidate chelating ligands through the weaker Ti−O bond, resulting in the formation of different octahedral stereoisomers in solution. Complexes 3−6, activated with MAO, were found to be active in the polymerization of propylene, producing elastomeric polypropylene. The elastomeric properties of the polymers obtained using complex 3 as catalyst are due to a dynamic interconversion between two C2-symmetric enantiomeric structure...
Databáze:	OpenAIRE
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