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- W64874654 abstract "Abstract 1. Studies by 1 H NMR on equilibria between contact ion pairs such as Cp 2 ZrCH 3 δ + …H 3 C-B(C 6 F 5 ) 3 δ - and binuclear alkyl zirconocene cations of the type (Cp 2 ZrCH 3 ) 2 (μ-CH 3 ) + lead to the conclusion that these binuclear species must generally be considered as participants in all homogeneous Ziegler-Natta systems. 2. Different polypropene chain lengths, which are obtained from cis- and trans-1D - propene with the catalyst en(thind) 2 ZrCl 2 /MAO, show that exchange of α-H with α-D atoms affect the rate of chain growth by a large kinetic isotope effect; this supports the notion that an α-agostic interaction facilitates the olefin insertion step. 3. A strong increase in polymer chain lengths, which is caused by the presence of α-methyl groups in ansa-zirconocene catalysts, is shown, by the effects of propene pressure on M W , to be due to the suppression of the otherwise predominant direct β-H-transfer to a coordinated olefin molecule by these α-substituents." @default.
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- W64874654 date "1994-01-01" @default.
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- W64874654 title "18. Reaction Mechanisms in Metallocene-Catalyzed Olefin Polymerization" @default.
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- W64874654 doi "https://doi.org/10.1016/s0167-2991(08)63034-7" @default.
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