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首页> 外文期刊>Catalysis science & technology >Selective dimerisation of 1-hexene mediated by aluminium alkyl chloride-activated tungsten imido complexes
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Selective dimerisation of 1-hexene mediated by aluminium alkyl chloride-activated tungsten imido complexes

机译：选择性的天津由二聚作用烷基铝chloride-activated钨酰亚胺的复合物

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The selective dimerisation of 1-hexene to dodecenes was accomplished using catalysts generated from a tungsten mono-[WCl4(NR)(thf)] or bis-[WCl2(NR)(2)(dme)] imido complex following activation with EtAlCl2. These catalytic systems achieve 1-hexene dimerisation with productivities of up to 3760 mol C-6 per mol W and selectivities towards the dimer fraction of 88-99 wt%. Tungsten pro-catalysts bearing imido ligands with electron donating groups give high productivity and good selectivity towards the desired methyl-branched dimers. Contrastingly, complexes with electron withdrawing imido motifs are inactive for oligomerisation, instead mediating 1-hexene isomerisation. The efficacy of different aluminium-containing activators is described, with EtAlCl2 giving the best catalytic performance at a low W : Al ratio of 8-20. Addition of catalyst modifiers (e.g. Oct(4)NCl and Et3N) is found to significantly improve the catalytic performance of the alkyl aluminium-activated olefin oligomerisation systems.
机译：天津石化的选择性二聚作用十二碳烯使用催化剂来完成产生一个钨mono - [WCl4 (NR)(四氢呋喃)]bis - [WCl2 (NR)(2)(测距装置)酰亚胺的复杂与EtAlCl2激活。与生产力实现天津石化二聚作用其他3760摩尔每摩尔W和选择性向的二聚体分数88 - 99 wt %。与电子pro-catalysts轴承酰亚胺的配体捐赠团体给高生产率和良好对所需的methyl-branched选择性二聚体。撤回酰亚胺的主题活动oligomerisation,而不是协调天津石化异构化。铝催化剂,与EtAlCl2给予最好的催化性能低W:艾尔8-20的比例。添加催化剂的修饰符(例如10月(4)NCl发现和Et3N)明显提高催化烷基的性能aluminium-activated烯烃oligomerisation系统。

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