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• W4283810130 abstract "Free N-heterocyclic carbenes (NHCs) are generally prepared by treatment of imidazolium precursors with strong alkali reagents, which usually produces inactive NHC dimers. This treatment would destroy porous supports and thus make supported NHC catalysts difficult to recovery and reuse. Herein, we report the first stable CO2 -masked N-heterocyclic carbenes (NHCs) grafted on a porous crystalline covalent organic framework (COF). The stable NHC-CO2 moieties in the COF-NHC-CO2 could be transformed in situ into isolated NHCs by heating, which exhibit superior catalytic performances in hydrosilylation and N-formylation reactions with CO2 . The NHC sites can reversibly form NHC-CO2 and thus can be easily recycled and reused while maintaining excellent catalytic activity. Density functional theory calculations revealed that NHC sites can be fully exposed after removal of CO2 -masks and rapidly react with silanes, which endows COF-NHC with high catalytic activity." @default.
• W4283810130 created "2022-07-06" @default.
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• W4283810130 date "2022-07-21" @default.
• W4283810130 modified "2023-10-18" @default.
• W4283810130 title "A CO₂‐Masked Carbene Functionalized Covalent Organic Framework for Highly Efficient Carbon Dioxide Conversion" @default.
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• W4283810130 doi "https://doi.org/10.1002/anie.202207478" @default.
• W4283810130 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/35789079" @default.
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