Chemistry is traditionally divided into organic and inorganic chemistry. The former is the study of compounds containing at least one carbon-hydrogen bonds. 366-18-7, Name is 2,2′-Bipyridine, molecular formula is C10H8N2, belongs to catalyst-ligand compound, is a common compound. In a patnet, author is Zhao, Yihua, once mentioned the new application about 366-18-7, Application In Synthesis of 2,2′-Bipyridine.
Reversion of the chain walking ability of alpha-diimine nickel and palladium catalysts with bulky diarylmethyl substituents
In general, alpha-diimine palladium species are more likely to undergo chain walking than the corresponding nickel species, resulting in more branched and topological polyethylene. Moreover, the ligand steric effects have a significant influence on the chain walking in alpha-diimine system. In this contribution, a series of acenaphthene-based alpha-diimine ligands bearing bulky diarylmethyl moieties with various electronic effects and the corresponding Ni(II) and Pd(II) complexes were synthesized and characterized. These Ni(II) complexes exhibit high activities in ethylene polymerization even at 80 degrees C, generating ultrahigh-molecular-weight polyethylenes with low branching density and high melting temperature. The corresponding palladium complexes display moderate activity, leading to semicrystalline polyethylene with low branching density and high melting temperature. Polar functionalized semicrystalline polyethylene with high melting temperature can also be obtained via copolymerization of ethylene with polar monomers using these palladium complexes. Moreover, the remote nonconjugated electronic substituents exert a great influence on the ethylene (co)polymerization. Most importantly, the chain walking ability of metal species can be controlled by changing the ligand steric environment, and the diarylmethyl substituents can even reverse the chain walking trend of palladium and nickel species. (C) 2020 Elsevier B.V. All rights reserved.
We¡¯ll also look at important developments in the pharmaceutical industry because understanding organic chemistry is important in understanding health, medicine, 366-18-7. The above is the message from the blog manager. Application In Synthesis of 2,2′-Bipyridine.
Reference:
Metal catalyst and ligand design,
,Ligand Template Strategies for Catalyst Encapsulation – NCBI