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Novel Effective Racemoselective Method for the Synthesis of ansa-Zirconocenes and Its Use for the Preparation of C2-Symmetric Complexes Based on 2-Methyl-4-aryltetrahydro(s)indacene as Catalysts for Isotactic Propylene Polymerization and Ethylene–Propylene Copolymerization
journal contribution
posted on 2012-06-11, 00:00 authored by Ilya E. Nifant’ev, Pavel V. Ivchenko, Vladimir V. Bagrov, Andrei V. Churakov, Reynald ChevalierA general and effective method for the racemoselective
synthesis
of bis-indenyl-type ansa-zirconocenes was proposed
and successfully applied for the synthesis of several C2-symmetric ansa-zirconocenes based on
2-methyl-4-aryltetrahydro-s-indacene. This new racemoselective
method relies on ZrCl3NH-tert-Bu as a
key reagent. The formation of racemic products was confirmed by NMR
studies and single-crystal X-ray diffraction. The novel complexes
are potent catalysts for isotactic propylene polymerization and ethylene–propylene
copolymerization.
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Racemoselective MethodEthyleneisotactic propylene polymerizationZrCl 3NHcopolymerizationracemic productsmethylIsotactic Propylene PolymerizationNMR studiesCatalystracemoselective methodSynthesiPreparationComplexeMethylformationcatalystethyleneCopolymerizationAnovel complexesreagentdiffractionracemoselective synthesis
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