Photoinduced Single Electron Reduction of the 4‐O‐5 Linkage in Lignin Models for C‐P Coupling Catalyzed by Bifunctional N‐Heterocyclic Carbenes

Autor:	Qiang Liu, Ying‐Zheng Ren, Bei‐Bei Zhang, Wen‐Xin Tang, Zhi‐Xiang Wang, Lin He, Xiang‐Yu Chen
Jazyk:	angličtina
Rok vydání:	2024
Předmět:	bifunctional N‐heterocyclic carbenes C─O bond activation lignin one electron reduction trivalent phosphines Science
Zdroj:	Advanced Science, Vol 11, Iss 38, Pp n/a-n/a (2024)
Druh dokumentu:	article
ISSN:	2198-3844
DOI:	10.1002/advs.202406095
Popis:	Abstract Catalytic activation of Caryl‐O bonds is considered as a powerful strategy for the production of aromatics from lignin. However, due to the high reduction potentials of diaryl ether 4‐O‐5 linkage models, their single electron reduction remains a daunting challenge. This study presents the blue light‐induced bifunctional N‐heterocyclic carbene (NHC)‐catalyzed one‐electron reduction of diaryl ether 4‐O‐5 linkage models for the synthesis of trivalent phosphines. The H‐bond between the newly devised bifunctional NHC and diaryl ethers is responsible for the success of the single electron transfer. Furthermore, this approach demonstrates selective one‐electron reduction of unsymmetric diaryl ethers, oligomeric phenylene oxide, and lignin model.
Databáze:	Directory of Open Access Journals
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