Dialkyl and Methyl-Alkyl Zirconocenes: Synthesis and Characterization of Zirconocene-Alkyls That Model the Polymeryl Chain in Alkene Polymerizations
Författare
Summary, in English
Zirconocene precatalysts with sterically bulky alkyl groups were designed as model systems for the propagating species in zirconocene-catalyzed alkene polymerization. Specialty alkyllithium reagents Li(CH2CEt3) and Li(CH2CMe2CH2Ph) were prepared and utilized in the synthesis of dialkyl and methyl-alkyl zirconocenes of the form CpCp*ZrR2, Cp2Zr(CH3)(R), and CpCp*Zr(CH3)(R) (Cp = (5-C5H5); Cp* = (5-C5Me5); R = CH2CMe3, CH2SiMe3, CH2CEt3, CH2CMe2CH2Ph). These new zirconocene alkyls were isolated and fully characterized by NMR spectroscopy and in some cases by X-ray diffraction. The molecular structures determined display the bent-sandwich coordination mode common for zirconocenes. The steric influence of the alkyl group on the observed structural parameters is reflected in slightly expanded C-Zr-C or C-Zr-Cl angles in the equatorial plane and long zirconium-alkyl bond distances.
Avdelning/ar
Publiceringsår
2007
Språk
Engelska
Sidor
3018-3030
Publikation/Tidskrift/Serie
Organometallics
Volym
26
Issue
12
Dokumenttyp
Artikel i tidskrift
Förlag
The American Chemical Society (ACS)
Ämne
- Organic Chemistry
Status
Published
ISBN/ISSN/Övrigt
- ISSN: 1520-6041