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Iron-catalyzed bromination of aryl azides by N-bromosuccinimide:Efficient method for the synthesis of brominated aryl azides

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Chinese Chemical Letters 2011年第3期22卷 310-313页

作者： Hui Jin Zhen Dong Huang Chun Xiang Kuang Xiao Kun Wang Department of Chemistry Tongji University Siping Road 1239 Shanghai 200092 China Zhejiang Citrus Research Institute Taizhou 318020 China

An efficient and mild protocol for bromination of aryl azides with N-bromosuccinimide（NBS） under FeCl_3 catalysis in 1,2- dichloroethane was *** is proved to be an efficient method for obtaining brominated aryl azides.

关键词： Iron-catalyzed Aryl azides N-Bromosuccinimide bromination

Polyvinylpolypyrrolidone-bromine complex:Mild and efficient polymeric reagent for bromination of activated aromatic compounds

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Chinese Chemical Letters 2011年第1期22卷 13-17页

作者： Masoud Mokhtary Moslem M.Lakouraj Department of Chemistry Islamic Azad University-Ayatollah Amoli BranchP.O.Box 678AmolIran Department of Organic-Polymer Chemistry Mazandaran UniversityBabolsar 47416Iran

Mild and efficient method for bromination of electron-rich aromatic compounds is described using polyvinylpolypyrrolidone- bromine complex （PVPP-Br2）. The reaction proceeded smoothly with phenols and N.N-alkylated a... 详细信息

关键词： Polyvinylpolypyrrolidone Phenols bromination Reagent

Selective α-bromination of β-Keto Esters in Reusable PEG-400 under Mild and Catalyst-free Conditions

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Chinese Journal of Chemistry 2006年第11期24卷 1662-1664页

作者：谢叶香唐石朱其明尹笃林李金恒 Key Laboratory of Chemical Biology & Traditional Chinese Medicine Research of Ministry of Education College of Chemistry and Chemical Engineering Hunan Normal University Changsha Hunan 410081 China

An efficient bromination protocol for the synthesis of α-bromo-β-keto esters has been developed. In PEG-400 （poly（ethylene glycol-400））, a variety of β-keto esters were treated with NBS （N-bromosuccinimide） at room temperature to selectively afford the corresponding α-monobromination products in excellent yields. It is noteworthy that the reaction was conducted under mild, environmentally benign and catalyst-free conditions.

关键词： bromination β-keto ester α-bromo-β-keto ester N-bromosuccinimide PEG-400

Isoquinolinium bromochromate:An efficient and stable reagent for bromination of hydroxylated aromatic compounds and oxidation of alcohols

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Chinese Chemical Letters 2009年第3期20卷 256-260页

作者： Sandeep V.Khansole Shivaji B.Patwari Archana Y.Vibhute Yeshwant B.Vibhute P.G.Department of Chemistry Yeshwant MahavidyalayaNanded 431605India

The new chromium （VI） oxidizing reagent isoquinolinium bromochromate （IQBC） was prepared and characterized. The IQBC has been found to be stable and an efficient solid reagent which can be easily prepared in good yield. It act as an efficient brominating reagent for hydroxylated aromatic compounds as well as good oxidizing reagent for the conversion of alcohols to carbonyl compounds in good to excellent yield. The synthesized isoquinolinium bromochromate is more ideal reagent, with number of specification including： higher yield, mild conditions and easy preparation. The results obtained with isoquinolinium bromochromate are satisfactory and suggest that the reagent has few advantages over the existing chromium （VI） reagents.

关键词： Isoquinolinium bromochromate bromination Hydroxylated aromatics Oxidation Alcohols

Green,mild and efficient bromination of aromatic compounds by HBr promoted by trans-3,5-dihydroperoxy-3,5-dimethyl-1,2-dioxolane in water as a solvent

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Chinese Chemical Letters 2012年第4期23卷 387-390页

作者： Kaveh Khosravi Samira Kazemi Department of Chemistry Faculty of ScienceUniversity of Arak Department of Chemistry Shahr-e-Rey branchIslamic Azad University

A combination of HBr and trans-3,5-dihydroperoxy-3,5-dimethyl-1,2-dioxolane as anew and powerful oxidant was found effective for facile brotnination of different aromatic compounds at room temperature in water as a green *** reaction conditions,high selectivity and yield,high reaction rate and non-toxicity are some of the major advantages of this synthetic protocol.

关键词： Trans-3 5-dihydroperoxy-3 5-dimethyl-1 2-dioxolane HBr bromination Anilines Phenoles

Regioselective bromination of 3, 4-Dimethoxytoluene with N-Bromosuccinimide

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Chinese Chemical Letters 2003年第4期14卷 371-374页

作者： Hong Min MA Zhan Zhu LIU Shi Zhi CHEN Institute of Materia Medica Peking Union Medical College&Chinese Academy of Medical SciencesBeijing 100050

The selective brominations of 3, 4-dimethoxytoluene with N-bromosuccinimide were reported. The nuclear and side-chain brominated products were obtained under different reaction conditions. The mechanism was also discu... 详细信息

关键词： bromination 3, 4-dimethoxy toluene N-bromosucinimide regioselective bromination.

Facile bromination of Aromatic Ethers with Quaternary Ammonium Bromide and Iodosylbenzene

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Chinese Chemical Letters 1998年第1期9卷 7-9页

作者： Jiang, YL Li, YC Yang, BG Gao, DB Tan, JY Yuan, YC Univ Adelaide Dept Chem Adelaide SA 5005 Australia Shanghai Res Inst Petrochem Technol Shanghai 201208 Peoples R China Dalian Univ Technol Sch Chem Engn Dalian 116012 Peoples R China

Aromatic ethers were conveniently brominated with quaternary ammonium bromide and iodosylbenzene in glacial acetic acid under mild conditions to give the corresponding monobromo-aromatic ethers in nearly quantitative ... 详细信息

关键词： bromination aromatic ether quaternary ammonium bromide iodosylbenzene

Catalyst-free Photochemical bromination of Unprotected Aromatic Amino Acid Derivatives by Using a Rotating Ultraviolet Photoreactor

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Chemical Research in Chinese Universities 2022年第2期38卷 505-509页

作者： ZHANG Tingting LUO Pan LAI Can LIU Zheyi JIN Yan WANG Fangjun CAS Key Laboratory of Separation Sciences for Analytical Chemistry Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023P.R.China University of Chinese Academy of Sciences Beijing 100049P.R.China

Aromatic amino acid halides are valuable amino acid derivatives and fundamental building blocks that are used to various coupling reaction^1-3!,such as Heck,Suzuki and Ullmann reaction[4-7],and also important precurso... 详细信息

关键词： Catalyst-free Photochemistry bromination 254 nm UV Unprotected aromatic amino acid derivative

Aromatic bromination with hydrogen production on organic‐inorganic hybrid perovskite‐based photocatalysts under visible light irradiation

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Chinese Journal of Catalysis 2022年第7期43卷 1805-1811页

作者： Yanfei Zhang Hong Wang Yan Liu Can Li State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina University of Chinese Academy of Sciences Beijing 100049China

Aromatic bromides are important chemicals in nature and chemical ***,their tra‐ditional synthesis routes suffer from low atomic economy and pollutant ***,we show that organic-inorganic hybrid perovskite methylammonium lead bromide(MAPbBr_(3))nanocrystals stabilized in aqueous HBr solution can achieve simultaneous aromatic bromination and hydrogen evolution using HBr as the bromine source under visible light *** hybridizing MAPbBr_(3) with Pt/Ta_(2)O_(5) and poly(3,4‐ethylenedioxythiophene)polystyrene sulfonate as electron‐and hole‐transporting motifs,aromatic bromides were achieved from aromatic compounds with high yield(up to 99%)and selectivity(up to 99%)with the addition of N,N‐dimethylformamide or its *** mechanistic studies revealed that the bromination proceeds via an electrophilic attack pathway and that HOBr may be the key intermediate in the bromination reaction.

关键词： Photocatalysis bromination Hydrogen Organic‐inorganic hybrid perovskite material Methylammonium lead bromide