Structure of Ziegler-Natta catalysts for the polymerization of isoprene.

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概要

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• Structural investigation was carried out by means of <SUP>1</SUP>H-NMR, ESR, and chemical ionization mass spectrometry on the complexes formed by the reaction of alkylaluminum with titanium(IV) <I>t</I>-butoxide or vanadium(IV) <I>t</I>-butoxide as a catalyst for polymerization of isoprene. The <I>t</I>-butoxide was monomeric in benzene, and reduced to form a bivalent complex <I>via</I> trivalent ones on addition of the alkylaluminum to the solution followed by the formation of two kinds of binuclear aluminum complexes. In the trivalent state the complexes caused polymerization of isoprene to form five kinds of polymers, 1,4-polymerization of isoprene being likely caused by tris[di-μ-t-butoxo-dialkyltitanium(III)]aluminum, or the corresponding vanadium(III) complex. The final product of the reduction of vanadium(IV) <I>t</I>-butoxide was bis(di-μ-alkyl-dialkylaluminum)vanadium(II), which exhibits no catalytic activity.

• 公益社団法人 日本化学会の論文

著者

• Fujiwara Yuzuru

  Central Research Laboratories, Kuraray Co, Ltd.

• Uetsuki Masao

  Central Research Laboratories, Kuraray Co, Ltd.

関連論文

• A study of the structures of aluminum complexes with isopropoxy and methyl groups using pulsed NMR and chemical ionization mass spectrometry.
• Structure of Ziegler-Natta catalysts for the polymerization of isoprene.

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