Scandium-Catalyzed Self-Assisted Polar Co-monomer Enchainment in Ethylene Polymerization

Jiazhen Chen, Yanshan Gao, Binghao Wang, Tracy L. Lohr, Tobin J Marks

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

Direct coordinative copolymerization of ethylene with functionalized co-monomers is a long-sought-after approach to introducing polyolefin functionality. However, functional-group Lewis basicity typically depresses catalytic activity and co-monomer incorporation. Finding alternatives to intensively studied group 4 d0 and late-transition-metal catalysts is crucial to addressing this long-standing challenge. Shown herein is that mono- and binuclear organoscandium complexes with a borate cocatalyst are active for ethylene + amino olefin [AO; H2C=CH(CH2)nNR2] copolymerizations in the absence of a Lewis-acidic masking reagent. Both activity (up to 4.2×102 kg mol−1⋅h−1> atm−1>) and AO incorporation (up to 12 % at 0.2 m [AO]) are appreciable. Linker-length-dependent (n) AO incorporation and mechanistic probes support an unusual functional-group-assisted enchainment mechanism. Furthermore, the binuclear catalysts exhibit enhanced AO tolerance and enhanced long chain AO incorporation.

Original languageEnglish
Pages (from-to)15964-15968
Number of pages5
JournalAngewandte Chemie - International Edition
Volume56
Issue number50
DOIs
Publication statusPublished - Dec 11 2017

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Keywords

  • Lewis acids
  • olefins
  • polymerization
  • reaction mechanisms
  • scandium

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

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