RT info:eu-repo/semantics/article
T1 Diastereoselective insertion of isocyanide into the alkyl metal bond of methylbenz[e]indenyl ansa-zirconocene complexes
A1 Sebastián Navas, Alfredo
A1 Royo Gracia, Pascual
A1 Gómez Sal, Pilar
A1 Ramírez de Arellano, Carmen
K1 Metallocenes
K1 Zirconium
K1 Insertion
K1 Isocyanides
K1 Polymerization
K1 Ciencia
K1 Química inorgánica
K1 Science
K1 Chemistry, inorganic
AB Alkylation of ansa-zirconocene [Zr{(η5-C5H5)SiMe2(MBI)}Cl2] (MBI = η5-2-Me−C13H7) with MgRCl gave the dimethyl complex [Zr{(η5-C5H5)SiMe2(MBI)}Me2], but unresolvable mixtures containing mono-alkylated compounds were obtained when bulkier alkyls were used. However pure dialkyl complexes [Zr{(η5-C5H5)SiMe2(MBI)}R2] (R = CH2Ph, CH2SiMe3) were easily obtained using K(CH2Ph) and Li(CH2SiMe3) as alkylating agents. Diastereoselective insertion into the MBI-unprotected Zr−R bond was observed when all of these dialkyl complexes were treated with 2,6-xylyl isocyanide to give the iminoacyl compounds [Zr{(η5-C5H5)SiMe2(MBI)}R{CR[η2-N-(2,6-xylyl)]}] (R = Me, CH2Ph, CH2SiMe3). All of the new complexes were characterized by NMR spectroscopy and the X-ray molecular structures of the dibenzyl and the imino-benzyl compounds were determined. The catalytic activity for ethene polymerization and ethene/1-hexene copolymerization of the dichloro zirconocenes [Zr{(η5-C5H5)EMe2(MBI)}Cl2] (E = C, Si), activated with methylalumoxane (MAO), was measured.
PB John Wiley & Sons
SN 1099-0682
YR 2004
FD 2004
LK http://hdl.handle.net/10017/4180
UL http://hdl.handle.net/10017/4180
LA eng
NO Repsol-YPF
DS MINDS@UW
RD 19-abr-2024