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Linear paired electrolysis of furfural to furoic acid at both anode and cathode in a multiple redox mediated system

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Green Energy & Environment 2024年第1期9卷 104-113页

作者： Xinxin Li Linchuan Cong haibo Lin Fangbing Liu Xiangxue Fu hai-chao xu Nan Lin State Key Laboratory of Inorganic Synthesis and Preparative Chemistry Jilin UniversityChangchun 130012JilinChina State Key Laboratory of Physical Chemistry of Solid Surfaces College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005FujianChina

Implementing a new energy-saving electrochemical synthesis system with high commercial value is a strategy of the sustainable development for upgrading the bulk chemicals preparation technology in the ***,we report a multiple redox-mediated linear paired electrolysis system,combining the hydrogen peroxide mediated cathode process with the I2 mediated anode process,and realize the conversion of furfural to furoic acid in both side of the dividedﬂow cell *** reasonably controlling the cathode potential,the undesired water splitting reaction and furfural reduction side reactions are *** the galvanostatic electrolysis,the two-mediated electrode processes have good compatibility,which reduce the energy consumption by about 22%while improving the electronic efﬁciency by about 125%.This system provides a green electrochemical synthesis route with commercial prospects.

关键词： Multiple redox mediated system Linear paired electrolysis Furfural Furoic acid

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电催化活性亚甲基化合物的环丙烷化反应

电化学（中英文） 2024年第4期30卷 1-5页

作者：揭亮华徐海超* 固体表面物理化学国家重点实验室福建省化学生物学重点实验室厦门大学化学与化丁学院福建厦门361005

由于三元环结构在中间体、天然产品和药物的合成中发挥着重要作用,这使得开发新的策略以获得环丙烷已变得越来越重要。在此,我们提出了一种通过活性亚甲基化合物和芳基烯烃的分子间脱氢环化合成环丙烷的电催化方法。该电化学过程不需要... 详细信息

由于三元环结构在中间体、天然产品和药物的合成中发挥着重要作用,这使得开发新的策略以获得环丙烷已变得越来越重要。在此,我们提出了一种通过活性亚甲基化合物和芳基烯烃的分子间脱氢环化合成环丙烷的电催化方法。该电化学过程不需要化学氧化剂,允许从廉价和简单易得的原料中快速获得各种官能团化的环丙烷。

关键词：电化学有机电合成催化剂环丙烷烯烃

Synthesis of 1,3-benzothiazines by intramolecular dehydrogenative C–S cross-coupling in a flow electrolysis cell

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Science China Chemistry 2019年第11期62卷 1501-1503页

作者： Chong Huang hai-chao xu State Key Laboratory of Physical Chemistry of Solid Surfaces Innovative Collaboration Center of Chemistry for Energy MaterialsKey Laboratory of Chemical Biology of Fujian Province College of Chemistry and Chemical Engineering Xiamen University

Dehydrogenative cyclization of thioamides is an attractive approach for the synthesis of *** herein is an electrochemical dehydrogenative cyclization reaction of N-benzyl thioamides in a flow electrolysis *** continuous-flow electrosynthesis has addressed the limitations associated with previously reported methods for the cyclization of alkylthioamides and provide a transition metal-and oxidizing reagent-free access to various functionalized 1,3-benzothiazines in good yields.

关键词： C-H functionalization electrochemistry flow chemistry heterocycles

Electrochem ically Enabled Intram olecular Am inooxygenation of Alkynes v ia Am idyl Radical Cyclization

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Chinese Journal of Chemistry 2020年第4期38卷 394-398页

作者： Zhong-Wei Hou hai-chao xu State Key Laboratory of Physical Chemistry of Solid Surfaces iChEMKey Laboratory of Chemical Biology of Fujian Provinceand College of Chemistry and Chemical EngineeringXiamen UniversityXiamenFujian 361005Chino

Summary of main observation and conclusion An electrochemical synthesis of oxazol-2-ones and imidazol-2-ones has been developed via 5-exo-dig cyclization of propargylic carbamates-and ureas-derived amidyl *** electrosynthesis relies on the dual function of 2,2,66-tetramethylpiperidin-1-y oxyl(TEMPO)as a redox mediator for amidyl radical formation and an oxygen atom *** reactions are conducted under mild conditions using a simple setup and provide convenient access to functionalized oxazol-2-ones and imidazol-2-ones from readily available materials.

关键词： materials. donor readily

*** Synthesis of （Aza）indolines via Dehydrogenative [3＋2] Annulatnon： Application to Total Synthesis of （±）-Hinckdentme At

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Chinese Journal of Chemistry 2018年第10期36卷 909-915页

作者： Zhong-Wei Hou Hong Yan Jin-Shuai Song hai-chao xu State Key Laboratory of Physical Chemistry of Solid Surfaces Key Laboratory of Chemical Biology of Fujian Province iChEM and College of Chemistry and Chemical Engineering Xiamen University Xiamen Fujian 361005 China Fujian Institute of Research on Structure of Matter Chinese Academy of Sciences Fuzhou Fujian 350002 China

An electrochemical synthesis of functionalized （aza）indolines through dehydrogenative [3＋2] annulation of arylamines with tethered alkenes has been developed. Previous reported syntheses through similar inter- and intramolecular annulation reactions required noble-metal catalysts and are mostly limited to terminal alkenes or 1,3-dienes. The electrosynthesis employs the easily available and inexpensive ferrocene as the molecular catalyst and is compatible with di-, tri- and even tetrasubstituted alkenes to construct indolines as well as the more challenging azaindolines. Employing the newly developed electrosynthesis as a key step, the total synthesis of marine alkaloid （＋）-hinckdentine A has been achieved in 12 steps （longest linear sequence） from commercially available materials.

关键词： electrochemistry indoline radical annulation hinckdentine A

Synthesis of Acridinium Photocatalysts via Site-Selective C–H Alkylation

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CCS Chemistry 2021年第12期3卷 317-325页

作者： Hong Yan Jinshuai Song Shaobin Zhu hai-chao xu Key Laboratory of Chemical Biology of Fujian Province State Key Laboratory of Physical Chemistry of Solid SurfacesCollege of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005 College of Chemistry and Molecular Engineering Zhengzhou UniversityZhengzhou 450001 NanoFCM Inc. Xiamen Pioneering Park for Overseas Chinese ScholarsXiamen 361006

Acridinium dyes have been broadly used as photocatalysts,but it remains synthetically challenging to fine-tune their catalytic performance by functionalization of their structural *** photocatalysts are usually prepar... 详细信息

关键词： acridinium photocatalysts electrocatalysis photocatalysis C–H alkylation flow chemistry

Recent Applications of Homogeneous Catalysis in Electrochemical Organic Synthesis

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CCS Chemistry 2022年第4期4卷 1120-1152页

作者： xu Cheng Aiwen Lei Tian-Sheng Mei hai-chao xu Kun xu Chengchu Zeng School of Chemistry and Chemical Engineering Nanjing UniversityNanjing 210023 College of Chemistry and Molecular Sciences Institute for Advanced Studies(IAS)Wuhan UniversityWuhan 430072 State Key Laboratory of Organometallic Chemistry Center for Excellence in Molecular SynthesisShanghai Institute of Organic ChemistryUniversity of Chinese Academy of SciencesChinese Academy of SciencesShanghai 200032 State Key Laboratory of Physical Chemistry of Solid Surfaces College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005 Faculty of Environment and Life Beijing University of TechnologyBeijing 100124

Although the combination of electrochemistry and homogeneous catalysis has proven to be a powerful strategy for achieving a diverse array of novel transformations,some challenges such as controlling the diffusion of catalyst-related species and the instability of catalysts at electrodes remain to be ***,we review recent advances in electrochemical homogeneous catalysis,focusing on electrochemical noble-transition-metal catalysis,photoelectrochemical catalysis,and electrochemical enantioselective *** topics discussed include:(1)how the noblemetal catalystworks in the presence of cathodic hydrogen evolution,(2)how the photocatalyst gets enhanced redox property,and(3)how the enantioselectivity is regulated in a catalytic electrochemical reaction.

关键词： electrochemistry homogeneous catalysis transition-metal catalysis electrophotocatalysis enantioselective catalysis

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

Preface for the Special Issue on“Safety and Intelligent Maintenance of Offshore Structures”

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China Ocean Engineering 2024年第2期38卷 181-182页

作者： xu Wan-hai State Key Laboratory of Hydraulic Engineering Intelligent Construction and Operation Tianjin UniversityTianjin 300072China

The ocean serves as a vital carrier for human resource development and economic growth and contains rich mineral resources such as oil,natural gas,polymetallic nodules,cobalt-rich ferromanganese crusts,polymetallic sulfides,and rare earth ***,the ocean has wealthy reserves of wind,wave,tidal,and solar energy,making it an essential strategic space for sustainable future ***,offshore structures are complex.

关键词： ocean offshore tidal