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- Title
Scandium-Catalyzed Self-Assisted Polar Co-monomer Enchainment in Ethylene Polymerization.
- Authors
Chen, Jiazhen; Gao, Yanshan; Wang, Binghao; Lohr, Tracy L.; Marks, Tobin J.
- 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.
- Subjects
SCANDIUM; MONOMERS; CATALYSTS; ORGANIC compounds; ALKENES; CHEMICALS; POLYMERIZATION
- Publication
Angewandte Chemie, 2017, Vol 129, Issue 50, p16180
- ISSN
0044-8249
- Publication type
Article
- DOI
10.1002/ange.201708797