From polyethylene waxes to HDPE using an α,α'-bis(arylimino)-2,3:5,6-bis(pentamethylene)pyridyl-chromium(iii) chloride pre-catalyst in ethylene polymerisation

Dalton Transactions : an International Journal of Inorganic Chemistry
Chuanbing HuangWen-Hua Sun

Abstract

Five examples of α,α'-bis(arylimino)-2,3:5,6-bis(pentamethylene)pyridyl-chromium(iii) chlorides (aryl = 2,6-Me2Ph Cr1, 2,6-Et2Ph Cr2, 2,6-i-Pr2Ph Cr3, 2,4,6-Me3Ph Cr4, 2,6-Et2-4-MePh Cr5) have been synthesized by the one-pot template reaction of α,α'-dioxo-2,3:5,6-bis(pentamethylene)pyridine, CrCl3·6H2O and the corresponding aniline. The molecular structures of Cr1 and Cr4 reveal distorted octahedral geometries with the N,N,N-ligand adopting a mer-configuration. On activation with an aluminium alkyl co-catalyst, Cr1-Cr5 exhibited high catalytic activities in ethylene polymerization and showed outstanding thermal stability operating effectively at 80 °C with activities up to 1.49 × 107g of PE (mol of Cr)-1h-1. Significantly, the nature of the co-catalyst employed had a dramatic effect on the molecular weight of the polymeric material obtained. For example, using diethylaluminium chloride (Et2AlCl) in combination with Cr4 gave high density/high molecular weight polyethylene with broad molecular weight distributions (30.9-39.3). By contrast, using modified methylaluminoxane (MMAO), strictly linear polyethylene waxes of lower molecular weight and narrow molecular weight distribution (1.6-2.0) were obtained with vinyl end-groups.

References

Dec 26, 2001·Chemical Reviews·S D IttelM Brookhart
Jan 9, 2003·Chemical Reviews·Vernon C Gibson, Stefan K Spitzmesser
May 2, 2003·Journal of the American Chemical Society·David S McGuinnessUlli Englert
Nov 13, 2004·Journal of the American Chemical Society·Annette BollmannSven Kuhlmann
May 10, 2007·Chemical Reviews·Vernon C GibsonGregory A Solan
Aug 8, 2007·Dalton Transactions : an International Journal of Inorganic Chemistry·Zhiqiang WengT S Andy Hor
Aug 6, 2009·Dalton Transactions : an International Journal of Inorganic Chemistry·Min ZhangWen-Hua Sun
Jan 10, 2012·Angewandte Chemie·Yacoob ShaikhRobbert Duchateau
Dec 25, 2012·Dalton Transactions : an International Journal of Inorganic Chemistry·Wenjuan ZhangCarl Redshaw
Apr 29, 2015·Dalton Transactions : an International Journal of Inorganic Chemistry·Yusheng ZhouJun Zhang
May 23, 2015·Dalton Transactions : an International Journal of Inorganic Chemistry·Jong Yeob JeonBun Yeoul Lee
Feb 15, 1999·Angewandte Chemie·George J P BritovsekDuncan F Wass

❮ Previous
Next ❯

Citations

Sep 6, 2018·Dalton Transactions : an International Journal of Inorganic Chemistry·Quande ZhengZhibo Li
Sep 7, 2018·Dalton Transactions : an International Journal of Inorganic Chemistry·Chuanbing HuangWen-Hua Sun
Jan 24, 2019·Dalton Transactions : an International Journal of Inorganic Chemistry·Zheng WangWen-Hua Sun
Nov 21, 2019·Dalton Transactions : an International Journal of Inorganic Chemistry·Randi ZhangWen-Hua Sun
Dec 4, 2019·Dalton Transactions : an International Journal of Inorganic Chemistry·Jingjing GuoWen-Hua Sun
May 20, 2020·Dalton Transactions : an International Journal of Inorganic Chemistry·Qiuyue ZhangWen-Hua Sun
May 16, 2019·Dalton Transactions : an International Journal of Inorganic Chemistry·Randi ZhangWen-Hua Sun
Dec 3, 2020·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Badral GansukhWen-Hua Sun

❮ Previous
Next ❯

Related Concepts

Trending Feeds

COVID-19

Coronaviruses encompass a large family of viruses that cause the common cold as well as more serious diseases, such as the ongoing outbreak of coronavirus disease 2019 (COVID-19; formally known as 2019-nCoV). Coronaviruses can spread from animals to humans; symptoms include fever, cough, shortness of breath, and breathing difficulties; in more severe cases, infection can lead to death. This feed covers recent research on COVID-19.

Blastomycosis

Blastomycosis fungal infections spread through inhaling Blastomyces dermatitidis spores. Discover the latest research on blastomycosis fungal infections here.

Nuclear Pore Complex in ALS/FTD

Alterations in nucleocytoplasmic transport, controlled by the nuclear pore complex, may be involved in the pathomechanism underlying multiple neurodegenerative diseases including Amyotrophic Lateral Sclerosis and Frontotemporal Dementia. Here is the latest research on the nuclear pore complex in ALS and FTD.

Applications of Molecular Barcoding

The concept of molecular barcoding is that each original DNA or RNA molecule is attached to a unique sequence barcode. Sequence reads having different barcodes represent different original molecules, while sequence reads having the same barcode are results of PCR duplication from one original molecule. Discover the latest research on molecular barcoding here.

Chronic Fatigue Syndrome

Chronic fatigue syndrome is a disease characterized by unexplained disabling fatigue; the pathology of which is incompletely understood. Discover the latest research on chronic fatigue syndrome here.

Evolution of Pluripotency

Pluripotency refers to the ability of a cell to develop into three primary germ cell layers of the embryo. This feed focuses on the mechanisms that underlie the evolution of pluripotency. Here is the latest research.

Position Effect Variegation

Position Effect Variagation occurs when a gene is inactivated due to its positioning near heterochromatic regions within a chromosome. Discover the latest research on Position Effect Variagation here.

STING Receptor Agonists

Stimulator of IFN genes (STING) are a group of transmembrane proteins that are involved in the induction of type I interferon that is important in the innate immune response. The stimulation of STING has been an active area of research in the treatment of cancer and infectious diseases. Here is the latest research on STING receptor agonists.

Microbicide

Microbicides are products that can be applied to vaginal or rectal mucosal surfaces with the goal of preventing, or at least significantly reducing, the transmission of sexually transmitted infections. Here is the latest research on microbicides.