Ultrarapid cerium(III)–NHC catalysts for high molar mass cyclic polylactide
Cyclic polyesters could improve the properties of degradable plastics, but routes to them that provide a product with faster rates, higher molar mass, and greater selectivity for cyclic vs linear polymer are needed. Here, homogeneous Ce(III)–N-heterocyclic carbene (NHC) catalysts show outstanding ac...
| Main Authors: | , , , , , |
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| Format: | Journal article |
| Language: | English |
| Published: |
American Chemical Society
2021
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| _version_ | 1826285809537384448 |
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| author | Kerr, RWF Ewing, PMDA Raman, SK Smith, AD Williams, C Arnold, PL |
| author_facet | Kerr, RWF Ewing, PMDA Raman, SK Smith, AD Williams, C Arnold, PL |
| author_sort | Kerr, RWF |
| collection | OXFORD |
| description | Cyclic polyesters could improve the properties of degradable plastics, but routes to them that provide a product with faster rates, higher molar mass, and greater selectivity for cyclic vs linear polymer are needed. Here, homogeneous Ce(III)–N-heterocyclic carbene (NHC) catalysts show outstanding activities (turn-over-frequency (TOF) > 864 000 h–1), excellent control, and selectivity for cyclic polylactide (PLA) topology (>95%), yielding high molar mass PLA (60 < Mn < 250 kg mol–1). They efficiently produce cyclic PLA from rac-lactide or l-lactide and aliphatic cyclic polyesters from ε-caprolactone or β-butyrolactone. The enhanced performances are only achievable from combining cooperative Lewis acidic cerium(III) and hemilabile N-heterocyclic carbene functionalities. |
| first_indexed | 2024-03-07T01:34:23Z |
| format | Journal article |
| id | oxford-uuid:94a676b7-24e4-40ad-a004-43483ac94327 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T01:34:23Z |
| publishDate | 2021 |
| publisher | American Chemical Society |
| record_format | dspace |
| spelling | oxford-uuid:94a676b7-24e4-40ad-a004-43483ac943272022-03-26T23:41:00ZUltrarapid cerium(III)–NHC catalysts for high molar mass cyclic polylactideJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:94a676b7-24e4-40ad-a004-43483ac94327EnglishSymplectic ElementsAmerican Chemical Society2021Kerr, RWFEwing, PMDARaman, SKSmith, ADWilliams, CArnold, PLCyclic polyesters could improve the properties of degradable plastics, but routes to them that provide a product with faster rates, higher molar mass, and greater selectivity for cyclic vs linear polymer are needed. Here, homogeneous Ce(III)–N-heterocyclic carbene (NHC) catalysts show outstanding activities (turn-over-frequency (TOF) > 864 000 h–1), excellent control, and selectivity for cyclic polylactide (PLA) topology (>95%), yielding high molar mass PLA (60 < Mn < 250 kg mol–1). They efficiently produce cyclic PLA from rac-lactide or l-lactide and aliphatic cyclic polyesters from ε-caprolactone or β-butyrolactone. The enhanced performances are only achievable from combining cooperative Lewis acidic cerium(III) and hemilabile N-heterocyclic carbene functionalities. |
| spellingShingle | Kerr, RWF Ewing, PMDA Raman, SK Smith, AD Williams, C Arnold, PL Ultrarapid cerium(III)–NHC catalysts for high molar mass cyclic polylactide |
| title | Ultrarapid cerium(III)–NHC catalysts for high molar mass cyclic polylactide |
| title_full | Ultrarapid cerium(III)–NHC catalysts for high molar mass cyclic polylactide |
| title_fullStr | Ultrarapid cerium(III)–NHC catalysts for high molar mass cyclic polylactide |
| title_full_unstemmed | Ultrarapid cerium(III)–NHC catalysts for high molar mass cyclic polylactide |
| title_short | Ultrarapid cerium(III)–NHC catalysts for high molar mass cyclic polylactide |
| title_sort | ultrarapid cerium iii nhc catalysts for high molar mass cyclic polylactide |
| work_keys_str_mv | AT kerrrwf ultrarapidceriumiiinhccatalystsforhighmolarmasscyclicpolylactide AT ewingpmda ultrarapidceriumiiinhccatalystsforhighmolarmasscyclicpolylactide AT ramansk ultrarapidceriumiiinhccatalystsforhighmolarmasscyclicpolylactide AT smithad ultrarapidceriumiiinhccatalystsforhighmolarmasscyclicpolylactide AT williamsc ultrarapidceriumiiinhccatalystsforhighmolarmasscyclicpolylactide AT arnoldpl ultrarapidceriumiiinhccatalystsforhighmolarmasscyclicpolylactide |