70416-71-6Relevant academic research and scientific papers
Bridge unites yinyin wu the zirconium, Louis composition and preparation method and application in the oligomerization of propylene
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Paragraph 0056-0060, (2018/06/19)
The invention discloses an ethylene-bridged indenyl-fluorenyl zirconium (hafnium) compound as well as a preparation method and application thereof in oligomerization of propylene. The ethylene-bridged indenyl-fluorenyl zirconium (hafnium) compound can be obtained by virtue of firstly reacting an ethylene-bridged indenyl-fluorenyl ligand compound with an alkyl alkali metal in an organic medium and then adding ZrCl4 or HfCl4. The ethylene-bridged indenyl-fluorenyl zirconium (hafnium) compound disclosed by the invention is an efficient catalyst and has high catalytic activity when used for catalyzing oligomerization of propylene under relatively mild conditions and thus the propylene oligomer containing allyl end groups can be highly selectively obtained in the presence of an untreated alkyl aluminoxane co-catalyst; and meanwhile, the control of the molecular weight of the oligomer can be achieved by virtue of controlling polymerization conditions and the ethylene-bridged indenyl-fluorenyl zirconium (hafnium) compound has very high industrial application values and has the structure represented by the formula as shown in the specification.
