Oligomerization of Isoprene by Vanadium Catalysts
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概要
- 論文の詳細を見る
Oligomerization of isoprene by the catalyst system consisting of VO(OEt)<SUB>3</SUB> and organoaluminum compounds was studied. Isoprene was oligomerized to a mixture of dimers, trimers and higher oligomers by VO(OEt)<SUB>3</SUB>–Et<SUB>2</SUB>AlCl catalyst system. 2,6-Dimethyl-1,<I>trans</I>-3,6-octatriene was the main dimer of isoprene in this reaction. The addition of tetrahydrofuran, dioxane, triphenylphosphine, bis-diphenylphosphinoethane, triethylamine or tetramethylethylenediamine to this catalyst system raised the reaction rate and the selectivity for the dimer at lower donor/VO(OEt)<SUB>3</SUB> molar ratios but suppressed the reaction at higher molar ratios. By VO(OEt)<SUB>3</SUB>–Et<SUB>3</SUB>Al catalyst system, isoprene was converted to a liquid polymer and by VO(OEt)<SUB>3</SUB>–EtAlCl<SUB>2</SUB> catalyst system, it was cyclopolymerized to an insoluble polymer. Structures of two new oligomers of isoprene were also reported.
- 公益社団法人 日本化学会の論文
著者
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Uchida Yasuzo
Department of Industrial Chemistry, Faculty of Engineering, The University of Tokyo
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Furuhata Ken-ichi
Department of Industrial Chemistry, Faculty of Engineering, The University of Tokyo
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Ishiwatari Hisayasu
Department of Industrial Chemistry, Faculty of Engineering, The University of Tokyo
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