Dimerization of Isoprene by Palladium-Diphosphine Complex Catalyst

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概要

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• Oligomerization of isoprene catalyzed by the PdBr<SUB>2</SUB>(Ph<SUB>2</SUB>PCH<SUB>2</SUB>CH<SUB>2</SUB>PPh<SUB>2</SUB>)<SUB>2</SUB>-PhONa catalyst was studied. The catalyst activity was greatly enhanced by the addition of phenol. Five linear dimers were identified. Distribution of the isomeric dimers was remarkably affected by the molar ratio of phenol to isoprene. The reaction in the presence of a small amount of phenol (phenol/isoprene=1/30) gave 2,7-dimethyl-1,<I>trans</I>-3,7-octatriene derived from a tail-to-tail dimerization almost selectively, while the addition of a large amount of phenol (phenol/isoprene=1/1.5) afforded head-to-head dimers (2-vinyl-5-methyl-1,6-heptadiene and 3,6-dimethyl-1,<I>cis</I>-3,7-octatriene) as main dimers (more than 40% of all the dimers). In a 1:3 ratio of phenol to isoprene the dimers consisted of mainly 2,6-dimethyl-1,<I>trans</I>-3,7-octatriene derived from a head-to-tail dimerization.

• 公益社団法人 日本化学会の論文

著者

• Hata Go

  Basic Research Laboratories Toray Inductries Inc.

• Takahashi Kuniyuki

  Basic Research Laboratories, Toray Industries, Inc.

• Miyake Akihisa

  Basic Research Laboratories, Toray Industries, Inc.

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• Dimerization of Malononitrile by Palladium and Platinum Complex Catalysts
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