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- W1995883278 abstract "Additive effects of diisobutylaluminum hydride (DiBAL-H) was studied in copolymerization of propylene and 1,3-butadiene with a series of C2-symmetric ansa-bis(indenyl)zirconocene derivatives, i.e., rac-dimethylsilylbis(2-methyl-4-phenylindenyl)zirconium dichloride (4Ph), dichloride, rac-dimethylsilylbis(2-methyl-benzoindenyl)zirconium dichloride (Bz), rac-dimethylsilylbis(2-methyl-indenyl) zirconium dichloride (2Me), rac-dimethylsilylbis(1-indenyl)zirconium dichloride (1-Ind), rac-ethylenebis(1-indenyl)zirconium dichloride (Et-Ind), activated by modified methylaluminoxane (MMAO). Without DiBAL-H, the activity of the copolymerization decreased in the following order, 2Me > 1-Ind > Et-Ind > 4Ph ≈ Bz, whereas butadiene content decreased in the following order, 4Ph > Bz ≥ Et-Ind ≥ 1-Ind > 2Me ≈ 0.1 mol%. The addition of DiBAL-H affected the activity but hardly changed the butadiene content. The copolymer obtained without DiBAL-H contained the butadiene units of 1,2-insertion (1,2-BD) and 1,4-insertion (1,4-BD). The addition of DiBAL-H decreased the amount of 1,4-BD and produced hydrogenated 1,4-BD in the 4Ph and Bz systems accompanied by the increase of the copolymerization activity. The additive effect of other alkylaluminums was investigated in the Bz system, and DEAL-H was found to show the similar effects with DiBAL-H. The 13C NMR analysis of the polymer terminated with deutrated methanol indicated the hydroalumination of 1,4-BD in the Bz system. Hydroxyl groups can be also introduced by oxidative cleavages of the Al–C bonds." @default.
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- W1995883278 date "2010-06-01" @default.
- W1995883278 modified "2023-10-17" @default.
- W1995883278 title "Additive effects of alkylaluminium compounds on propylene-1,3-butadiene copolymerization using isospecific zirconocene catalysts" @default.
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- W1995883278 doi "https://doi.org/10.1016/j.jorganchem.2010.04.003" @default.
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