Zwitterionic Nickel(II) Catalyst for CO–Ethylene Alternating Copolymerization
作者:Xiaofei Jia、Mengru Zhang、Fan Pan、Ilknur Babahan、Kuiling Ding、Li Jia、Laura A. Crandall、Christopher J. Ziegler
DOI:10.1021/acs.organomet.5b00676
日期:2015.10.26
A zwitterionic nickel(II) catalyst has been discovered to display an initial catalytic activity comparable to that of cationic palladium catalysts for alternating copolymerization of carbon monoxide and ethylene. This demonstrates the absence of a severe dormant state in the present zwitterionic system, in contrast to the cationic nickel(II) catalysts. However, the highly active catalyst is short-lived. Stoichiometric decomposition of the catalyst under carbon monoxide suggests that the insufficient stability of the tetraphenylborate motif in the ligand framework with respect to electrophilic attack is likely a culprit for catalyst deactivation.
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