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Synthesis of Cyclic Polyolefin: Ring-Opening Metathesis Polymerization by Binuclear Vanadium Complexes

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Chinese Journal of Chemistry 2021年第5期39卷 1181-1187页

作者： Xiaohua Hou Xiaojian Chen Xiang Gao Lei Xu Hui Zou Li Zhou Zong-Quan Wu Department of Polymer Science and Engineering School of Chemistry and Chemical Engineeringand Anhui Key Laboratory of Advanced Catalytic Materials and Reaction EngineeringHefei University of Technology193 Tunxi RoadHefeiAnhui 230009China

Ring-opening metathesis polymerization(ROMP)of norbornene by binuclear vanadium alkylidene in-situ formed from dialkyl complexes was *** activities were observed by the binuclear system than mononuclear *** the cyclic polymers were obtained and *** is proposed that cyclic binuclear vanadium alkylidene was afforded due to the intramolecular chain-transfer *** size of polymer ring could be adjusted by the vanadium catalyst structure and polymerization *** results were also observed in the ROMP of cyclopentene.

关键词： Metathesis Polymerization Homogeneous catalysis carbenes Vanadium

Bio-inspired tetracarbene compounds as a new family of energy saving catalysts

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Journal of Energy Chemistry 2023年第4期79卷 559-561页

作者： Bo Zhang Fritz E.Kühn CAS Key Laboratory of Science and Technology on Applied Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina' University of Chinese Academy of Science Beijing 100049China Molecular Catalysis Catalysis Research Center and Department of ChemistrySchool of Natural SciencesTechnical University of MunichLichtenbergstr 485748 Garching bei MünchenGermany

Efficient use of energy is a pressing *** of chemical processes is currently an important target for energy *** chemical processes are independent of pathways with respect to the final energy output or consumption,the application of catalysts can reduce involved activation energies considerably and therefore save large amounts of energy.

关键词： Catalysis Iron carbenes Multidentate ligands

Palladium（o）-Catalyzed Si-Si Bond Insertion by the Terminal Nitrogen of Diazo Compoundst

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Chinese Journal of Chemistry 2018年第10期36卷 945-949页

作者： Zhenxing Liu Tianren Fu Jingfeng Huo Sheng Feng Jianbo Wang Beijing National Laboratory of Molecular Sciences (BNLMS) and Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education College of Chemistry Peking University Beijing 100871China

The palladium（o）-catalyzed nitrogen insertion into cyclic Si-Si bonds has been realized by using N-tosylhydrazones/diazo compounds as the nitrogen source. The palladium（Ⅱ） nitrene formation and subsequent migrato... 详细信息

关键词： insertion diazo compounds Si-Si bond palladium catalysts palladium(Ⅱ) nitrene carbenes

Highly Enantioselective Trapping of Carboxylic Oxonium Ylides with Imines for Direct Assembly of Enantioenriched γ-Butenolides

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CCS Chemistry 2020年第4期2卷 432-439页

作者： Dan Zhang Xin Wang Mengchu Zhang Zhenghui Kang Guolan Xiao Xinfang Xu Wenhao Hu Guangdong Key Laboratory of Chiral Molecule and Drug Discovery School of Pharmaceutical SciencesSun Yat-Sen UniversityGuangzhou 510006

Enantioenrichedγ-butenolides are valuable structural cores in many pharmaceuticals and natural products,but their direct and catalytically asymmetric assembly remains ***,we report an efficient,atom-economic synthetic strategy for enantioenrichedγ-butenolides via a unique enantioselective reaction of cyclopropene carboxylic acids with imines under the synergistic catalysis of Rh2(esp)2/chiral Brønsted acid *** reaction involved trapping of carboxylic oxonium ylides,generated from cyclopropene carboxylic acids,which presented as the first asymmetric trapping reactive intermediate in the process.

关键词： cyclopropenes vinyl carbenes ylides asymmetric catalysis γ-butenolides

Copper-Catalyzed Ring-Opening/Borylation of Cyclopropenes

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CCS Chemistry 2022年第4期4卷 1232-1237页

作者： Ming-Yao Huang Yu-Tao Zhao Hao Chai Cheng-Da Zhang Shou-Fei Zhu The State Key Laboratory and Institute of Elemento-Organic Chemistry College of ChemistryNankai UniversityTianjin 300071

Since organoboron compounds readily undergo a diverse array of transformations and are widely used in various fields,the development of C-B-bondforming reactions have attracted considerable ***,we report a new method for forming C-B bonds by means of Cu-catalyzed ring-opening/borylation reactions of *** method provides efficient access to a new type of stable allylborane-Lewis base adduct,which is a versatile *** configuration of the products can be well controlled with this method,and some of the configurations we obtained are inaccessible by other catalytic methods for generating *** studies indicated that the reactions proceed via insertion of an alkenyl Cu carbene—generated in situ by cyclopropene ring opening—into the B-H bond;the ring-opening step determines both the rate and stereochemistry.

关键词： cyclopropenes carbenes B-H bond insertion copper catalysis allylboranes

Palladium/Imadazolium Salt Mediated Cyclisations for the Synthesis of Heterocyclic Compounds

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International Journal of Organic Chemistry 2015年第4期5卷 223-231页

作者： William Kofie Stephen Caddick Centre for Drug Design and Development Department of Pharmaceutical Chemistry Faculty of Pharmacy and Pharmaceutical Sciences Kwame Nkrumah University of Science and Technology Kumasi Ghana Centre for Biomolecular Design and Drug Development The Chemistry Laboratory CPES University of Sussex Brighton UK Department of Chemistry University College London London UK

The use of intramolecular reactions involving palladium/imidazolium salts to synthesize hetero-cyclic compounds is described. Reactivity of phenyl, ethyl and methyl substituents leading to isolation of various isomeri... 详细信息

关键词： N-Heterocyclic carbenes Heterocyclic Systems Imidazolium Salt Intramolecular Cyclicsations Phosphine Ligands