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Self-assisted stereospecific polymerization of unmasked polar 4-methylthio-1-butene

  • Yunjie Chai
  • Chunji Wu
  • Dongtao LiuEmail author
  • Mingtao RunEmail author
  • Dongmei Cui
Articles
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Abstract

Stereospecific polymerization of polar olefins has always been an attractive but challenging project because the Lewis basic polar groups of monomers are usually poisonous to the Lewis acidic metal centers of the catalysts. In this contribution, thiophene-fused cyclopentadienyl scandium complexes 13 were successfully synthesized. Combined with alkylaluminium and organoborate, these complexes showed extremely low activity and no selectivity for 1-hexene polymerization. Surprisingly, highly stereo-selective coordination polymerization of unprotected polar 4-methylthio-1-butene has been achieved in high activity for the first time under the same polymerization conditions. High-molecular-weight (Mn=110×103) and perfectly syn-diotactic (rrrr>99%) poly(4-methylthio-1-butene) (P(MTB)) was afforded. Thus the methylthio-group-assisted mechanism that the unmasked methylthio group promoted the polymerization through σ-π chelation to the active scandium center together with the vinyl group was proposed. Moreover, the methylsulfonyl functionalized syndiotactic poly(1-butene) was also easily prepared by the oxidation of P(MTB). These results provided a new route for the synthesis of functionalized stereo-regular polyolefins.

Keywords

self-assisted polymerization stereoselectivity polar α-olefin rare-earth metal catalyst functionalized poly(1-butene) 

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Notes

Acknowledgements

This work was supported by the National Natural Science Foundation of China (21674108, 21634007, 21774118), and the Science and Technology Development Project of Jilin Province (20190201067JC).

Supplementary material

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Self-Assisted Stereospecific Polymerization of Unmasked Polar 4-Methylthio-1-Butene
11426_2018_9438_MOESM2_ESM.pdf (169 kb)
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Copyright information

© Science China Press and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.College of Chemistry and Environmental ScienceHebei UniversityBaodingChina
  2. 2.State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchunChina

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