Selective dimerization of ethylene catalyzed by halogenotris(triphenylphosphine)cobalt(I) complex-Lewis acid.
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概要
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Dimerization of ethylene is highly selectively catalyzed by CoX(PPh<SUB>3</SUB>)<SUB>3</SUB> (X=Cl, Br, and I) in the presence of Lewis acid in halobenzene under mild conditions. The catalytic activity is significantly affected by the solvent, bromobenzene being the most effective. The role of BF<SUB>3</SUB>·OEt<SUB>2</SUB> seems to be formation of a one-to-one complex of Co(I) and BF<SUB>3</SUB>, since the rate of ethylene dimerization attains a plateau on addition of equimolar amount of BF<SUB>3</SUB>·OEt<SUB>2</SUB>. The isomerization of 1-pentene is enhanced by addition of molecular hydrogen or ethylene to the catalyst system. The isotopic scrambling between C<SUB>2</SUB>H<SUB>4</SUB> and C<SUB>2</SUB>D<SUB>4</SUB> takes place faster than dimerization. The results are in line with hydridocobalt intermediate formed by the oxidative addition of ethylene to Co(I) complex.
- 公益社団法人 日本化学会の論文
著者
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Ozaki Atsumu
Research Laboratories of Resources Utilization, Tokyo Institute of Technology
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Mizoroki Tsutomu
Research Laboratory of Resources Utilization, Tokyo Institute of Technology
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Kawakami Kiyoshi
Research Laboratory of Resources Utilization, Tokyo Institute of Technology
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