Ultrarapid Cerium(III)–NHC Catalysts for High Molar Mass Cyclic Polylactide
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https://figshare.com/articles/dataset/Ultrarapid_Cerium_III_NHC_Catalysts_for_High_Molar_Mass_Cyclic_Polylactide/13584983
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资源简介：
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.
创建时间：
2021-01-15
