期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 9, 期 5, 页码 2367-2377出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.0c08771
关键词
heterogeneous photocatalysis; K-modified carbon nitride; decarboxylation; dimerization; continuous flow
资金
- National Natural Science Foundation of China [21801030, 21672210]
- Basic and Frontier Research Project of Chongqing [cstc2018jcyjAX0413]
- Venture & Innovation Support Program for Chongqing Overseas Returnees [cx2018060]
By modifying the structure of carbon nitride, a heterogeneous photocatalytic system for both decarboxylative addition and reductive dimerization has been developed with remarkable catalytic activity. The system offers advantages such as lower catalyst loading, enhanced optical absorption, improved electron-hole separation, good recyclability, broad substrate scope, and easy scale-up in continuous flow for valued target synthesis.
Heterogeneous photocatalysis has emerged as a green and sustainable technique in organic synthesis. Developing highly effective heterogeneous photocatalysts that outperformed classical ruthenium-/iridium-based homogeneous ones for the visible-light mediated organic transformations is actively pursued by chemists but remains challenging. Herein, a modified carbon nitride-based heterogeneous photocatalytic system for both decarboxylative addition and reductive dimerization of para-quinone methides has been developed. The potassium-intercalated carbon nitride (CN-K) facile prepared by the direct KCl-induced structure remodeling of bulk g-C3N4 exhibited remarkable catalytic activity. The catalyst loading can be decreased to 0.025-0.25 mg/mL, which is significantly lower than that in homogeneous photocatalysis. Studies on the structure characterizations and photoelectric properties of CN-K and g-C3N4 imply that the enhanced activity of CN-K was attributed to its K-intercalated poly(heptazine)-based structure and existed as small lamellar nanocrystallites, thus leading to enhanced optical absorption, improved electron-hole separation, and easy dispersion in polar solvents. The heterogeneous nature and mild reaction conditions of this protocol allow for good catalyst recyclability, broad substrate scope, scale-up in a continuous flow, and applications to the valued target synthesis.
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