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Deng S, Liu Z, Liu B, Jin Y. Unravelling the Role of Al‐alkyl Cocatalyst for the VO
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Ethylene Polymerization Catalyst: Diethylaluminum Chloride Vs. Triethylaluminum. ChemCatChem 2021. [DOI: 10.1002/cctc.202001929] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Shiheng Deng
- Key Laboratory for Biobased Materials and Energy of Ministry of Education College of Materials and Energy South China Agricultural University Guangzhou 510630 P.R. China
- Guangdong Laboratory for Lingnan Modern Agriculture Guangzhou 510630 P.R. China
| | - Zhen Liu
- State Key Laboratory of Chemical Engineering School of Chemical Engineering East China University of Science and Technology Shanghai 200237 P.R. China
| | - Boping Liu
- Key Laboratory for Biobased Materials and Energy of Ministry of Education College of Materials and Energy South China Agricultural University Guangzhou 510630 P.R. China
- Guangdong Laboratory for Lingnan Modern Agriculture Guangzhou 510630 P.R. China
| | - Yulong Jin
- Key Laboratory for Biobased Materials and Energy of Ministry of Education College of Materials and Energy South China Agricultural University Guangzhou 510630 P.R. China
- Guangdong Laboratory for Lingnan Modern Agriculture Guangzhou 510630 P.R. China
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Chain Transfer to Solvent and Monomer in Early Transition Metal Catalyzed Olefin Polymerization: Mechanisms and Implications for Catalysis. Catalysts 2021. [DOI: 10.3390/catal11020215] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
Even after several decades of intense research, mechanistic studies of olefin polymerization by early transition metal catalysts continue to reveal unexpected elementary reaction steps. In this mini-review, the recent discovery of two unprecedented chain termination processes is summarized: chain transfer to solvent (CTS) and chain transfer to monomer (CTM), leading to benzyl/tolyl and allyl type chain ends, respectively. Although similar transfer reactions are well-known in radical polymerization, only very recently they have been observed also in olefin insertion polymerization catalysis. In the latter context, these processes were first identified in Ti-catalyzed propene and ethene polymerization; more recently, CTS was also reported in Sc-catalyzed styrene polymerization. In the Ti case, these processes represent a unique combination of insertion polymerization, organic radical chemistry and reactivity of a M(IV)/M(III) redox couple. In the Sc case, CTS occurs via a σ-bond metathesis reactivity, and it is associated with a significant boost of catalytic activity and/or with tuning of polystyrene molecular weight and tacticity. The mechanistic studies that led to the understanding of these chain transfer reactions are summarized, highlighting their relevance in olefin polymerization catalysis and beyond.
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Flisak Z, Spaleniak GP, Bremmek M. Impact of Organoaluminum Compounds on Phenoxyimine Ligands in Coordinative Olefin Polymerization. A Theoretical Study. Organometallics 2013. [DOI: 10.1021/om4003347] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Zygmunt Flisak
- Faculty of Chemistry, University of Opole, Oleska 48, 45-052
Opole, Poland
| | | | - Maria Bremmek
- Faculty of Chemistry, University of Opole, Oleska 48, 45-052
Opole, Poland
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