Chemistry is an experimental science, and the best way to enjoy it and learn about it is performing experiments.Introducing a new discovery about 95-13-6, Name is Indene, molecular formula is , belongs to catalyst-ligand compound. In a document, author is Zheng, Handou, Name: Indene.
Combining hydrogen bonding interactions with steric and electronic modifications for thermally robust alpha-diimine palladium catalysts toward ethylene (co)polymerization
Development of thermally robust palladium-based catalysts for (co)polymerization of ethylene and polar monomers with high activities is a continuing challenge. Combining hydrogen bonding interactions with steric and electronic modifications, dibenzobarrelene-based alpha-diimine palladium complexes with different substituents (X = OMe, H, Cl, Br, and I) have been synthesized and characterized. The steric effect of the palladium complexes was elucidated by their buried volumes, and the electronic effect of the substituents was clarified by the Hammett constants (sigma) of the substituents and H-1 NMR analysis of the Pd-bound methyl. The hydrogen bonding interactions (H center dot center dot center dot Cl and H center dot center dot center dot OMe) were confirmed by single crystal structures of chloro- and methoxy-substituted neutral and cationic palladium complexes. Contributed by the steric and electronic effects as well as the hydrogen bonding, the chloro-substituted palladium catalyst was thermally robust at temperatures as high as 100 degrees C for ethylene polymerization, while the methoxy-substituted palladium catalyst showed excellent tolerance toward high temperature and polar groups and was able to copolymerize ethylene and methyl acrylate (MA) at 80 degrees C to produce the copolymer with high MA incorporation up to 9.5 mol%.
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Reference:
Metal catalyst and ligand design,
,Ligand Template Strategies for Catalyst Encapsulation – NCBI