From alternating to selective distributions in chromium-catalysed ethylene oligomerisation with asymmetric BIMA ligands

Nobbs James D.; Tomov Atanas K.; Young Craig T.White Andrew J. P.Britovsek George J. P.

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From alternating to selective distributions in chromium-catalysed ethylene oligomerisation with asymmetric BIMA ligands

机译：从交流到选择性分布chromium-catalysed乙烯oligomerisation与不对称位配体

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The oligomerisation of ethylene with chromium-based catalysts containing asymmetric BIMA (bis(benzimidazole) methylamine) ligands produces linear alpha olefins (LAOs) that follow an alternating distribution. The catalytic activity and the degree of alternation is affected by the different ligands; in particular variations at the backbone of the ligand affect the nature of the distribution. For certain catalysts a deviation from regular alternating behaviour is observed, whereby increased amounts of 1-hexene and 1-octene (up to 29 mol%) are obtained compared to the amount expected from the distribution analysis based on C-10-C-34 LAOs. This behaviour towards more selective oligomerisation to 1-hexene and 1-octene can be explained by varying probabilities of single and double ethylene insertion. The deviations will depend on the size of the metallacycle and are most pronounced early on during the metallacycle growth.

机译：的oligomerisation乙烯含铬催化剂不对称位(bis(苯并咪唑)甲胺)配体产生线性α烯烃(老挝)一个交替分布。活动和交替的程度受不同的配体;变化在配体影响的骨干分布的性质。催化剂偏离常规交替观察到的行为,大量增加天津石化和1-octene(29摩尔%)获得比预期的数量基于C-10-C-34老挝分布分析。这种行为更有选择性oligomerisation天津石化和1-octene可以不同概率的单一和解释双乙烯插入。的大小取决于metallacycle和在早期在metallacycle最为显著增长。

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《Catalysis science & technology》 |2018年第5期|1314-1321|共8页
作者
Nobbs James D.; Tomov Atanas K.; Young Craig T.White Andrew J. P.Britovsek George J. P.;
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作者单位

Imperial Coll London, Dept Chem, Exhibit Rd, London SW7 2AZ, England;

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正文语种英语
中图分类汉语教学;
关键词
1-hexene; ethylene; LaosMETALLACYCLEOligomerisation1-octeneAlternate;

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From alternating to selective distributions in chromium-catalysed ethylene oligomerisation with asymmetric BIMA ligands

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