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The supramolecular redox functions of metallomacromolecules

Journal of Leather Science and Engineering 2020年第1期2卷 129-145页

作者： Didier Astruc ISM UMR CNRS 5255Univ.Bordeaux351 Cours de la Liberation33405 Talence CedexFrance

Metallomacromolecules are frequently encountered in redox proteins including metal-tanned hide collagen and play crucial roles involving supramolecular properties in biological electron-transfer *** are also currently found in non-natural families,such as:metallopolymers,metallodendrimers and metallodendronic *** mini-review discusses the supramolecular redox functions of such nanomaterials developed in our research ***-transfer processes are first examined in mono-,bis-and hexa-nuclear ferrocenes and other electron-reservoir organoiron systems showing the influence of supramolecular and reorganization aspects on their *** applications of electron-transfer processes using these same organoiron redox systems in metallomacromolecules and their supramolecular functions are discussed including redox recognition/sensing,catalysis templates,electrocatalysis,redox catalysis,molecular machines,electrochromes,drug delivery device and nanobatteries.

关键词： Ferrocene electron reservoir Polymer Dendrimer redox catalyst redox sensor Molecular machine Supramolecular template Electrochrome Drug delivery device Battery

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Sustainable and practical semi-heterogeneous photosynthesis of 5-amino-1,2,4-thiadiazoles over WS_(2)/TEMPO

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Chinese Chemical Letters 2024年第8期35卷 250-253页

作者： Jia-Cheng Hou Hong-Tao Ji Yu-Han Lu Jia-Sheng Wang Yao-Dan Xu Yan-Yan Zeng Wei-Min He School of Chemistry and Chemical Engineering University of South ChinaHengyang 421001China

An eco-friendly and practical method for the clean preparation of 5-amino-1,2,4-thiadiazoles was *** WS_(2)as the semiconductor photocatalyst,both TEMPO and O_(2)(in air)as the redox catalysts,a variety of thiadiazoles were semi-heterogeneously formed in high to quantitative yields and could be easily collected by CPME extraction and ***,the catalytic system can be reusable for at least 5 reaction runs.

关键词： Green chemistry Thiadiazoles Heterogeneous catalyst redox catalyst Extraction

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Visible light promoted difunctionalization reactions of alkynes

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Chinese Journal of Catalysis 2019年第7期40卷 1003-1019页

作者： Xiang Ren Zhan Lu Department of Chemistry Zhejiang UniversityHangzhou 310058ZhejiangChina

Visible light promoted difunctionalization of alkynes is reviewed. The difunctionalization reaction is achieved by different reagents. Radicals such as carbon(sp3), carbon(sp2), and other heteroatom(P, S, N, Se, O, and halide) radicals initiated by visible light can undergo radical addition to a carbon-carbon triple bond. Upon further transformation, the desired difunctionalized products are obtained. Some organometallic complexes can be activated by visible light;the difunctionalization of alkynes is catalyzed by these species. Other reagents like 1,3-dipole precursors could also react with alkynes to give difunctionalization products;here, the 1,3-dipole derivatives are obtained by visible light photocatalysis. So far, the strategy has been succeeded in the formation of C–C bonds and C–X bonds. Several valuable chemical skeletons have been constructed under mild conditions. However, high regio-and stereoselectivities in some direct difunctionalization methodologies are yet to be achieved.

关键词： Visible light photocatalysis Difunctionalization Cyclization Alkyne redox catalyst

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Recent advances in organic electrosynthesis employing transition metal complexes as electrocatalysts

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Science Bulletin 2021年第23期66卷 2412-2429页

作者： Cong Ma Ping Fang Zhao-Ran Liu Shi-Shuo Xu Kun Xu Xu Cheng Aiwen Lei Hai-Chao Xu Chengchu Zeng Tian-Sheng Mei State Key Laboratory of Organometallic Chemistry Shanghai Institute of Organic ChemistryUniversity of Chinese Academy of SciencesChinese Academy of SciencesShanghai 200032China Faculty of Environment and Life Beijing University of TechnologyBeijing 100124China Jiangsu Key Laboratory of Advanced Organic Materials School of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023China College of Chemistry and Molecular Sciences Institute for Advanced StudiesWuhan UniversityWuhan 430072China College of Chemistry and Chemical Engineering Xiamen UniversityXiamen 361005China

Organic electrosynthesis has been widely used as an environmentally conscious alternative to conventional methods for redox reactions because it utilizes electric current as a traceless redox agent instead of chemical redox agents. Indirect electrolysis employing a redox catalyst has received tremendous attention, since it provides various advantages compared to direct electrolysis. With indirect electrolysis, overpotential of electron transfer can be avoided, which is inherently milder, thus wide functional group tolerance can be achieved. Additionally, chemoselectivity, regioselectivity, and stereoselectivity can be tuned by the redox catalysts used in indirect electrolysis. Furthermore, electrode passivation can be avoided by preventing the formation of polymer films on the electrode surface. Common redox catalysts include N-oxyl radicals, hypervalent iodine species, halides, amines, benzoquinones(such as DDQ and tetrachlorobenzoquinone), and transition metals. In recent years, great progress has been made in the field of indirect organic electrosynthesis using transition metals as redox catalysts for reaction classes including C–H functionalization, radical cyclization, and cross-coupling of aryl halides-each owing to the diverse reactivity and accessible oxidation states of transition metals. Although various reviews of organic electrosynthesis are available, there is a lack of articles that focus on recent research progress in the area of indirect electrolysis using transition metals, which is the impetus for this review.

关键词： Organic electrosynthesis Indirect electrolysis redox catalyst Transition metal Electrocatalyst

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