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Polymers 2016, 8(11), 389; doi:10.3390/polym8110389

Influences of Alkyl and Aryl Substituents on Iminopyridine Fe(II)- and Co(II)-Catalyzed Isoprene Polymerization

1
School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, China
2
Key Laboratory of Soft Matter Chemistry, Chinese Academy of Sciences, Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei 230026, China
*
Author to whom correspondence should be addressed.
Academic Editor: Alexander Böker
Received: 28 September 2016 / Revised: 18 October 2016 / Accepted: 28 October 2016 / Published: 3 November 2016
(This article belongs to the Special Issue Young Talents in Polymer Science)
View Full-Text   |   Download PDF [1650 KB, uploaded 3 November 2016]   |  

Abstract

A series of alkyl- and aryl-substituted iminopyridine Fe(II) complexes 1a7a and Co(II) complexes 2b, 3b, 5b, and 6b were synthesized. The activator effect, influence of temperature, and, particularly, the alkyl and aryl substituents’ effect on catalytic activity, polymer molecular weight, and regio-/stereoselectivity were investigated when these complexes were applied in isoprene polymerization. All of the Fe(II) complexes afforded polyisoprene with high molecular weight and moderate cis-1,4 selectivity. In contrast, the Co(II) complexes produced polymers with low molecular weight and relatively high cis-1,4 selectivity. In the iminopyridine Fe(II) system, the alkyl and aryl substituents’ effect exhibits significant variation on the isoprene polymerization. In the iminopyridine Co(II) system, there is little influence observed on isoprene polymerization by alkyl and aryl substituents. View Full-Text
Keywords: iminopyridine; Iron(II); Cobalt(II); isoprene polymerization; selectivity iminopyridine; Iron(II); Cobalt(II); isoprene polymerization; selectivity
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Guo, L.; Jing, X.; Xiong, S.; Liu, W.; Liu, Y.; Liu, Z.; Chen, C. Influences of Alkyl and Aryl Substituents on Iminopyridine Fe(II)- and Co(II)-Catalyzed Isoprene Polymerization. Polymers 2016, 8, 389.

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