The role of phosphine and 1,2-diimine complexes of nickel in the oxidation states 0, +1, and +2 in the catalyzed di-, oligo-, and polymerization of ethylene

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• 作者：F. K. Shmidt ; Yu. Yu. Titova ; L. B. Belykh
• 关键词：nickel catalysts ; hydridonickel(II) complexes ; phosphine complexes ; 1 ; 2 ; diimine complexes ; ESR of Ni(I) ; di ; oligoand polymerization of ethylene ; mechanism
• 刊名：Kinetics and Catalysis
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：57
• 期：1
• 页码：61-71
• 全文大小：430 KB
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• 作者单位：F. K. Shmidt (1)
  Yu. Yu. Titova (1)
  L. B. Belykh (1)
  
  1. Irkutsk State University, Irkutsk, 664003, Russia
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Catalysis
  Physical Chemistry
  Russian Library of Science
  
• 出版者：MAIK Nauka/Interperiodica distributed exclusively by Springer Science+Business Media LLC.
• ISSN：1608-3210

文摘

The turnover frequency and number have been determined for eighteen catalytic systems based on triphenylphosphine and 1,4-diazo-1,3-butadiene complexes of nickel in the formal oxidation states 0, +1, and +2 in the oligoand polymerization of lower alkenes. The main catalytic characteristics are almost independent of the oxidation state of nickel in the precursor and depend on the nature and concentration of the cocatalyst (Lewis acid). The catalytic systems have been studied by ESR. The ESR spectral parameters are presented for nickel(I) 1,4-diazo-1,3-butadiene complexes and radical anions resulting from the reactions of the cocatalyst with nickel α-diimine complexes. Reactions describing the formation, functioning, decomposition, and regeneration of the catalytically active nickel hydride complexes are proposed.