Position Makes the Difference: Electronic Effects
in Nickel-Catalyzed Ethylene Polymerizations and Copolymerizations
Posted on 2018-11-08 - 22:44
A series of phosphine-sulfonate
ligands and the corresponding nickel
complexes are prepared and characterized. These ligands are specifically
designed to bear systematically varied electron-donating and -withdrawing
substituents (H, OMe, NMe2, CF3, and Me). More
importantly, these substituents are installed at different positions
on the ligand framework, namely, the para-position of the phenylphosphino
group (position X), and para to the arylsulfonate group of the main
ligand (position Y). These nickel complexes are highly active single-component
catalysts for the polymerization of ethylene. An electron-donating
substituent at position X or an electron-withdrawing substituent at
position Y is beneficial to the properties of these nickel catalysts.
Specifically, the catalyst bearing the NMe2 substituent
at position X exhibits high stability and high activity (3.3 ×
106 g mol–1 h–1), and
catalyzes the formation of polyethylene of high molecular weight (Mn 405 000) and high melting point (Tm 138.5 °C). This catalyst also mediates
the efficient copolymerizations of ethylene with methyl 10-undecenoate,
6-chloro-1-hexene, and trimethoxyvinylsilane.
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Liang, Tao; Chen, Changle (2018). Position Makes the Difference: Electronic Effects
in Nickel-Catalyzed Ethylene Polymerizations and Copolymerizations. ACS Publications. Collection. https://doi.org/10.1021/acs.inorgchem.8b02687
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