Vinyl polymerizations of norbornene catalyzed by nickel complexes with acetoacetamide ligands |
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| Authors: | Qian Feng Dajun Chen Danyang Feng Libin Jiao Zhigang Peng Lixia Pei |
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| Affiliation: | 1. College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu, China;2. Institute of Oil Production Technology, Shengli Oilfield, Dongying, China;3. Institute of Drilling Technology, Shengli Oilfield, Dongying, China;4. School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, China |
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| Abstract: | On the basis of a remote effect, a series of acetoacetamide ligands and corresponding nickel complexes N‐(R‐phenyl) acetoacetamide Ni(CH2Ph) (PMe3) (R = H, 1 ; R = 2‐methyl, 2 ; R = 2,6‐dimethyl, 3 ; R = 2,6‐diisopropyl, 4 ; R = 4‐NO2, 5 ) were synthesized and characterized. The solid structure of complex 3 was confirmed by X‐ray single‐crystal analysis to be of cis form. 1H and 31P NMR spectroscopy confirmed that cis and trans isomers of nickel complexes were present in solution. Norbornene polymerizations with acetoacetamide nickel complexes activated with modified methylaluminoxane (MMAO) were investigated in detail. Remote steric and electronic effects of acetoacetamide ligand on catalytic activity and molecular weight of polynorbornenes (PNBs) were observed. Characterizations of the obtained PNBs show that the obtained polymer products are non‐crystalline vinylic‐addition polynorbornenes. Copyright © 2013 John Wiley & Sons, Ltd. |
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| Keywords: | norbornene acetoacetamide nickel catalyst vinyl polymerization |
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