Chelate control in the nickel-complex catalysed homogeneous oligomerization of ethylene

Q4 Chemical Engineering

分子催化 Pub Date : 1994-08-12 DOI:10.1016/0304-5102(94)00050-6

Wilhelm Keim, Rolf P. Schulz

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引用次数: 81

Abstract

The impact of various k²-P⌢O chelate ligands on nickel catalysed ethylene oligomerization has been investigated. The ligands 4-8 and 14, 15 were reacted with bis(π-methallyl)nickel yielding seven new complexes, 9-13 and 16, 17 in which the k²-P⌢O chelate ring size was altered and in which methyl substituents were introduced into the k²-P⌢O chelate. These complexes served as precursor complexes leading to active ethylene oligomerization catalysts. Increasing the chelate ring size from a five-membered to a six or seven-membered ring diminishes catalytic activity dramatically. However, by introducing double bonds or an aromatic ring into the six-membered nickelaheterocycle yielded very active ethylene oligomerization systems. Introducing methyl groups into Ph₂PCH(CH₃)COOH (14) and Ph₂PC(CH₃)₂COOH (15) also leads to a significant increase in activity.

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镍络合物催化乙烯均匀寡聚反应的螯合控制

研究了不同的k2-P O螯合配体对镍催化乙烯低聚反应的影响。配体4-8和14,15与双(π-甲基)镍反应，得到了7个新的配合物9-13和16,17，改变了k2-P O螯合物的环大小，并在k2-P O螯合物中引入了甲基取代基。这些配合物作为前驱配合物，导致活性乙烯低聚催化剂。将螯合环的大小从五元增加到六元或七元，会显著降低催化活性。然而，通过在六元镍杂环中引入双键或芳香环，产生了非常活跃的乙烯低聚体系。在Ph2PCH(CH3)COOH(14)和Ph2PC(CH3)2COOH(15)中引入甲基也能显著提高活性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

分子催化 Chemical Engineering-Catalysis

CiteScore

1.50

自引率

0.00%

发文量

2959

期刊介绍： Journal of Molecular Catalysis (China) is a bimonthly journal, founded in 1987. It is a bimonthly journal, founded in 1987, sponsored by Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, under the supervision of Chinese Academy of Sciences, and published by Science Publishing House, which is a scholarly journal openly circulated both at home and abroad. The journal mainly reports the latest progress and research results on molecular catalysis. It contains academic papers, research briefs, research reports and progress reviews. The content focuses on coordination catalysis, enzyme catalysis, light-ribbed catalysis, stereochemistry in catalysis, catalytic reaction mechanism and kinetics, the study of catalyst surface states and the application of quantum chemistry in catalysis. We also provide contributions on the activation, deactivation and regeneration of homogeneous catalysts, solidified homogeneous catalysts and solidified enzyme catalysts in industrial catalytic processes, as well as on the optimisation and characterisation of catalysts for new catalytic processes. The main target readers are scientists and postgraduates working in catalysis in research institutes, industrial and mining enterprises, as well as teachers and students of chemistry and chemical engineering departments in colleges and universities. Contributions from related professionals are welcome.