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学者姓名：杨新拓
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Abstract ：
The enantioselective separation of racemate, particularly those containing C(sp3 )-H bonds knowns for their high bond dissociation energies and significant polarity, presents a significant challenge in pharmaceutical synthesis. Recent advances have witnessed the fusion of photocatalysis with hydrogen atom transfer (HAT) methodologies, marking a notable trend in synthesis of chiral molecules. This technique uses the excitation of a catalyst to activate substrates, enabling the selective isomerization of chiral centers containing C(sp3 ) configurations. This process distinctively facilitates the direct activation of the C(sp3 )-H bond in targeted reagents. This review systematically discusses the photocatalytic isomerization of various chiral molecule featuring C(sp3 )-H centers, capable of undergoing deracemization through two primary HAT mechanisms: direct and indirect pathways. From the perspective of synthetic organic chemistry, this field has progressed towards the development of isomerization strategies for molecules that incorporate an activating group at the alpha-position adjacent to the C(sp3 ) chiral center. Moreover, it covers methodologies applicable to molecules characterized by specific C-C and C-S bond configurations. The integration of photocatalysis with HAT technology thus provides valuable strategies for the synthesis of enantiopure compounds with enhanced selectivity and efficiency. (c) 2025 Published by Elsevier B.V. on behalf of Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences.
Keyword ：
Deracemization Deracemization Hydrogen atom transfer Hydrogen atom transfer Photocatalysis Photocatalysis
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| GB/T 7714 | Liu, Yuan , Yin, Zhu , Yang, Xintuo et al. Advances in photocatalytic deracemization of sp3-hybridized chiral centers via hydrogen atom transfer [J]. | CHINESE CHEMICAL LETTERS , 2025 , 36 (5) . |
| MLA | Liu, Yuan et al. "Advances in photocatalytic deracemization of sp3-hybridized chiral centers via hydrogen atom transfer" . | CHINESE CHEMICAL LETTERS 36 . 5 (2025) . |
| APA | Liu, Yuan , Yin, Zhu , Yang, Xintuo , Cheng, Jiajia . Advances in photocatalytic deracemization of sp3-hybridized chiral centers via hydrogen atom transfer . | CHINESE CHEMICAL LETTERS , 2025 , 36 (5) . |
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Abstract ：
The integration of heterogeneous photocatalysts with nickel catalysis is garnering considerable interest for their capacity to enable distinct metal-photoredox processes for organic synthesis. However, the challenge about robustness and recyclability of the photocatalyst persists. Herein, a crystalline carbon nitride (MCN-B) photocatalyst with intentionally introduced defects and a dedicated designed active site has been presented. Results reveal by incorporating the deprotonated cyano-group (N--CN) sites, this host material could provide stable binding sites for Ni (II) ions through the Hard-Soft Acid-Base (HSAB) effect, thereby facilitating charge transmission between semiconductor and metal centers. Consequently, the integrated carbon nitride nickel (Ni/MCNB) heterogeneous photocatalyst demonstrates high effectiveness in diverse photocatalytic C-N coupling reactions (21 examples, up to 93% yield) under conditions free from organic ligands and additives, which shows competent performance to the homogeneous catalysts. Moreover, the Ni/MCN-B catalyst demonstrates remarkable recyclability, maintaining its photoredox efficiency after 10 cycles with minimal loss of activity and a diminished metal leaching rate, which signifies a substantial advancement in the field of photocatalytic system design.
Keyword ：
Carbon nitride Carbon nitride Cross-coupling Cross-coupling Crystalline polymer Crystalline polymer Photocatalysis Photocatalysis
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| GB/T 7714 | Zhang, Huali , Chen, Xiaoxiao , Cheng, Jiajia et al. Heterogeneous metallaphotocatalytic Cross-Coupling reactions by a carbon Nitride-Nickel catalyst [J]. | JOURNAL OF CATALYSIS , 2024 , 433 . |
| MLA | Zhang, Huali et al. "Heterogeneous metallaphotocatalytic Cross-Coupling reactions by a carbon Nitride-Nickel catalyst" . | JOURNAL OF CATALYSIS 433 (2024) . |
| APA | Zhang, Huali , Chen, Xiaoxiao , Cheng, Jiajia , Yang, Xintuo , Lin, Wei , Hou, Yidong et al. Heterogeneous metallaphotocatalytic Cross-Coupling reactions by a carbon Nitride-Nickel catalyst . | JOURNAL OF CATALYSIS , 2024 , 433 . |
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Hydrogen peroxide (H2O2) plays a crucial role in various applications, such as green oxidation processes and the production of high-quality fuels. Currently, H2O2 is primarily manufactured using the indirect anthraquinone method, known for its significant energy consumption and the generation of intensive by-products. Extensive research has been conducted on the photocatalytic production of H(2)O(2)via oxygen reduction reaction (ORR), with polymeric carbon nitride (PCN) emerging as a promising catalyst for this conversion. This review article is organized around two approaches. The first part main consists of the chemical optimization of the PCN structure, while the second focuses on the physical integration of PCN with other functional materials. The objective is to clarify the correlation between the physicochemical properties of PCN photocatalysts and their effectiveness in H2O2 production. Through a thorough review and analysis of the findings, this article seeks to stimulate new insights and achievements, not only in the domain of H2O2 production via ORR but also in other redox reactions.
Keyword ：
H2O2 H2O2 Hybrid structure Hybrid structure Oxygen reduction reaction Oxygen reduction reaction Photocatalysis Photocatalysis Polymeric carbon nitride Polymeric carbon nitride
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| GB/T 7714 | Zheng, Dandan , Wu, Yahan , Yang, Xintuo et al. Developing Polymeric Carbon Nitrides for Photocatalytic H2O2 Production [J]. | CHEMSUSCHEM , 2024 , 17 (20) . |
| MLA | Zheng, Dandan et al. "Developing Polymeric Carbon Nitrides for Photocatalytic H2O2 Production" . | CHEMSUSCHEM 17 . 20 (2024) . |
| APA | Zheng, Dandan , Wu, Yahan , Yang, Xintuo , Wang, Sibo , Fang, Yuanxing . Developing Polymeric Carbon Nitrides for Photocatalytic H2O2 Production . | CHEMSUSCHEM , 2024 , 17 (20) . |
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