Redox Switchable Copolymerization of Cyclic Esters and Epoxides by a Zirconium Complex
Abstract
A zirconium precatalyst, (salfan)Zr(O t Bu) 2 (salfan = 1,1′-di(2- tert -butyl-6- N -methylmethylenephenoxy)ferrocene), shows activity for the redox-controlled block copolymerization of l -lactide and cyclohexene oxide. The role of the oxidant is examined, and several diblock (AB and BA) and triblock copolymers (ABA and BAB) were synthesized and characterized.
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Similar copolymerization of LA and epoxides were obtained using a redox-switchable zirconium complex.
“Similar copolymerization of LA and epoxides were obtained using a redox-switchable zirconium complex.321”
From Catalysis as an Enabling Science for Sustainable Polymers (2018) · cites this paper as [321]
These ionic catalysts are prepared by simple deprotonation of the neutral ureas or thioureas.
“These ionic catalysts are prepared by simple deprotonation of the neutral ureas or thioureas.”
From Catalysis as an Enabling Science for Sustainable Polymers (2018) · cites this paper as [321]
A class of (thio)urea anions catalysts were disclosed that exhibit both high activity and selectivity for the ROP of a variety of cyclic esters and carbonates.
“Recently a class of (thio)urea anions catalysts were disclosed that exhibit both high activity and selectivity for the ROP of a variety of cyclic esters and carbonates (Scheme 12).321,336”
From Catalysis as an Enabling Science for Sustainable Polymers (2018) · cites this paper as [321]
DFT calculations suggested a bifunctional mechanism analogous to that of TBD, where the (thio)imidiates behave as a proton shuttle to pick up the proton from the initiator/chain end, to stabilize the tetrahedral intermediate via double H-bonds, and to deliver the proton back to the chain end after ring-opening.
“DFT calculations suggested a bifunctional mechanism analogous to that of TBD, 321 where the (thio)imidiates behave as a proton shuttle to pick up the proton from the initiator/chain end, to stabilize the tetrahedral intermediate via double H-bonds, and to deliver the proton back to the chain end after ring-opening.”
From Catalysis as an Enabling Science for Sustainable Polymers (2018) · cites this paper as [321]
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- Authors
- Quan, S. M., Wang, X., Zhang, R., & Diaconescu, P. L.
- Affiliations
- University of California, Los Angeles (US)
- Corresponding author
- Diaconescu, Paula L.
- Venue
- Macromolecules
- Publisher
- American Chemical Society (ACS)
- Published
- 2016-09-09
- Volume
- 49
- Issue
- 18
- Pages
- 6768-6778
- ISSN
- 0024-9297 (ISSN-L)
- 1520-5835
- OpenAlex
- W2510292018
- Cited by
- 93
- References
- 59
- Citations by year
- 2026: 5 · 2025: 6 · 2024: 5 · 2023: 9 · 2022: 5 · 2021: 11 · 2020: 7 · 2019: 15 · 2018: 10 · 2017: 18 · 2016: 2
- FWCI
- 6.14
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Macromolecules (publishedVersion)
- eScholarship (California Digital Library) (submittedVersion)
- Funders
- National Science Foundation (1362999)
- John Simon Guggenheim Memorial Foundation
- Topics
- Physical Sciences › Materials Science › Biomaterials › biodegradable polymer synthesis and properties
- Physical Sciences › Chemistry › Organic Chemistry › Advanced Polymer Synthesis and Characterization
- Physical Sciences › Chemical Engineering › Process Chemistry and Technology › Carbon dioxide utilization in catalysis
- Keywords
- zirconium complexes, block copolymerization, cyclic esters, epoxides, L-lactide, cyclohexene oxide, ferrocene ligands, diblock copolymers, triblock copolymers
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