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homocoupling of Aryl Iodides Catalyzed by Cyclopalladated Complexes of Tertiary Arylamines

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Chinese Journal of Chemistry 2004年第5期22卷 419-421页

作者：李强聂娟杨帆郑瑞邹刚汤杰 Department of Chemistry East China Normal University Shanghai 200062 China

homocoupling of aryl iodides catalyzed by cyclopalladated complexes of tertiary arylamines gives symmetric biaryls with good yields in DMA or ionic liquid [Bmim]BF4. This catalytic alternative of the Ullmann reaction ... 详细信息

关键词： cyclopalladated complex tertiary arylamine homocoupling aryl iodide ionic liquid

Synthesis of [2,2’]Bifuranyl-5,5’-dicarboxylic Acid Esters Wd Reductive homocoupling of 5-Bromofuran-2-carboxylates Using Alcohols as Reductants

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Chinese Journal of Chemistry 2021年第1期39卷 62-68页

作者： Yi Xie Bin Yu Jiajun Luo Biaolin Yin Huanfeng Jiang Key Laboratory of Functional Molecular Engineering of Guangdong Province School of Chemistry and Chemical EngineeringSouth China University of TechnologyGuangzhouGuangdong 510640China

Herein,we describe an environmentally benign and cost.efective protocol for the synthesis of valuable bifuranyl dicarboylates,starting with a-bromination of readily accessible furan-2-carboylates by LiBr and K_(2)S_(2)O_(8).Furthermore,the bromination intermediate product 5-bromofuran-2-carboxylates were then conducted in a palladium-catalyzed reductive homocoupling reactions in the pres-ence of alcohols to afford bifuranyl dicarboxylates.One of the final products in this protocol,[2,2']bifuran-5,5'-dicarboxylic acid es-ters,are essential monomers of poly(ethylene bifuranoate),which can be served as an green and versatile alternative polymer for traditional poly(ethylene terephthalate)that is currently common in technical plastics.

关键词： Bifuranyl dicarboxylates homocoupling Bromination Green reductant

Palladium-catalyzed oxidative homocoupling of 2-arylquinazolinones

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Chinese Chemical Letters 2020年第12期31卷 3263-3266页

作者： Yadong Feng Zhengping Wu Ting Chen Qi Fu Qihua You Jinhai Shen Xiuling Cui College of Einviranment and Public Health Xiamen Huaxia UniversityXiamen 361024China Research Center of Molecular Medicime Mdinistry of EducationKey Laboratory of Fujian Molecular MedicineKey laboratory of Precision Medicine and Molecular Dinghosis of Fujian UniversitiesKey Laboratory of Xiamen Marine and Cene DrugsSchool of Bionedical SciencsHuaqiao University Xiamen 361021China

Pd-catalyzed oxidative homocoupling of 2-arylquinazolinones was successfully developed for the direct construction of biaryls via C—H bond activation.New well-defined structure that possessed two quinazolinone units was obtained with high efficiency and atomic economy.The protocols offer an efficient approach to the synthetically useful and functionalized biaryls in good yields using quinazolinone as a directing group.

关键词： 2-Arylquinazolinones homocoupling Palladium-catalyzed C—H bond activation

Cerium Salt Promoted homocoupling Reaction of Dialkylanilines in Water

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Chemical Research in Chinese Universities 2008年第2期24卷 226-230页

作者： YANG Xiang-hua LU Wen-chao LIAO Qian XI Chan-juan Key Laboratory for Bioorganic Phosphorus Chemistry ＆ Chemical Biology Ministry of Education Department of Chemistry Tsinghua University Beijing 100084 P. R. China

Highly regioselective homocoupling of N,N-dialkylanilines can be achieved in water with cerium reagents, in which various N,N,N′,N′-tetraalkylbenzidines are obtained from N,N-dialkylanilines either by direct oxidati... 详细信息

关键词： homocoupling Regioselectivity Cerium salts N,N-Dialkylaniline N,N,N′,N′-Tetraalkylbenzidine

Phenazine-based supramolecular photosensitizing assemblies:A“smart”selectivity control on catalytic activity of Pd(Ⅱ)nanoparticles

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聚集体(英文)

聚集体(英文) 2023年第1期4卷 173-183页

作者： Aditya Singh Manoj Kumar Vandana Bhalla Department of Chemistry UGC Sponsored-Centre of Advance Studies-ⅡGuru Nanak Dev UniversityAmritsarPunjabIndia

Photosensitizing supramolecular assemblies based on a phenazine derivative(PPA)have been developed,which show a strong affinity toward Pd2+ions to generate supramolecular ensemble PPA@Pd nanoparticles(NPs).The PPA@Pd NPs catalyse the Suzuki cross-coupled reaction under mild conditions(aerial conditions,mixed aqueous media,and visible light radiations).Although PPA@Pd NPs exhibit a strong affinity for arylboronic acid and could catalyse homocoupling of arylboronic acid,the preference of PPA assemblies for aryl halide directed the course of reactions toward the formation of cross-coupled products.The electron-rich PPA assemblies not only facilitate the oxidative addition step through photoinduced electron transfer to Pd^(2+)ions but also bring the reactants closer to the catalytic sites by selective interactions with aryl halides in the presence of arylboronic acid under visible light irradiation.The efficiency of PPA@Pd NPs to catalyse the Suzuki crosscoupled reaction has been demonstrated for the synthesis of unsymmetrically substituted terphenyl derivatives.

关键词： ensemble homocoupling phenazine photosensitizing supramolecular assemblies Suzuki cross-coupled

Ligand-free Copper-catalyzed Synthesis of Symmetrical Diynes from 1,1-Dibromo-1 -alkenes

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Chinese Journal of Chemistry 2011年第3期29卷 592-594页

作者： Jin, Hui Kuang, Chunxiang Department of Chemistry Tongji University Shanghai 200092 China

Symmetrical diynes were synthesized by ligand-free copper-catalyzed homocoupling reaction of 1,1-dibromo-1- alkenes using a DBU/DMSO system at room temperature in good to excellent yields.

关键词： symmetrical diynes copper-catalyzed 1,1-dibromo-l-alkenes ligand-free homocoupling

Mechanistic elucidation of the role of metal oxidation states in nickel mediated electrocatalytic coupling of benzyl halides

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Green Synthesis and Catalysis

Green Synthesis and Catalysis 2020年第2期1卷 143-149页

作者： Pradip K.Das Priyanka Chakraborty Sandeep Suryabhan Gholap Theo P.Gonçalves Changguang Yao Huaifeng Li Zhiping Lai Abdul-Hamid Emwas Kuo-Wei Huang Division of Physical Sciences and Engineering King Abdullah University of Science and TechnologyThuwal 23955-6900Saudi Arabia KAUST Catalysis Center King Abdullah University of Science and TechnologyThuwal 23955-6900Saudi Arabia Advanced Membrane and Porous Materials Center King Abdullah University of Science and TechnologyThuwal 23955-6900Saudi Arabia KAUST Core labs King Abdullah University of Science and TechnologyThuwal 23955-6900Saudi Arabia

We present the mechanistic understanding of an electrochemically-driven nickel-catalyzed coupling reaction.Computational analysis reveals that the spin density is mostly residing on the nickel(Ni)center when Ni^(II) is reduced to NiI.Ni-mediated halogen atom abstraction through outer-sphere electron-transfer pathway to yield coupling products under mild conditions is demonstrated.Importantly,we have elucidated the role of Ni^(I) and Ni^(0) for successive coupling of benzyl bromide and benzyl chloride derivatives,respectively,to corresponding bibenzyl products.The Ni-catalyst bearing a PN^(3) P-ligand is an effective catalyst,producing a strong ligand effect on the reactivity and selectivity for the homocoupling reactions.

关键词： PN^(3) P pincer Nickel Mechanism Electrocatalysis homocoupling