检索结果-南通市图书馆

Carbon dioxide fixation into Cyclic carbonates at room temperature catalyzed by heteroscorpionate aluminum complexes

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Green Chemical Engineering 2022年第3期3卷 280-287页

作者： Felipe de la Cruz-Martinez Jose A.Castro-Osma Agustin Lara-Sanchez Universidad de Castilla-La Mancha Departamento de Quimica InorganicaOrganica y Bioquimica-Centro de Innovacion en Quimica Avanzada(ORFEO-CINQA)Facultad de Ciencias y Tecnologias QuimicasCiudad Real13071Spain Instituto de Investigaciones Quimicas(IIQ) Departamento de Quimica Inorganica and Centro de Innovacion en Quimica Avanzada(ORFEO-CINQA)Consejo Superior de Investigaciones Cientificas(CSIC)and University of SevillaSevilla41092Spain Universidad de Castilla-La Mancha Departamento de Quimica InorganicaOrganica y Bioquimica-Centro de Innovacion en Quimica Avanzada(ORFEO-CINQA)Facultad de FarmaciaAlbacete02071Spain

Novel mono-and bimetallic scorpionate aluminum compounds have been designed and characterized by spec-troscopic methods.These organometallics complexes,in combination with tetrabutylammonium bromide as cocatalyst,displayed good catalytic activity for the cycloaddition of styrene oxide and CO_(2) under ambient con-ditions.Among the compounds tested,monometallic complex 3 featuring diethylamino groups showed the highest catalytic activity.This catalytic system catalyzed the formation of cyclic carbonate products from their corresponding epoxides at room temperature and 1 bar of CO_(2) pressure in the absence of a solvent in good yields and excellent selectivities.

关键词： CO_(2) Epoxides Cyclic carbonates Aluminum complexes

Ti and Zr amino-tris(phenolate) catalysts for the synthesis of Cyclic carbonates from CO_(2) and epoxides

在线全文

学校读者我要写书评

暂无评论

Green Chemical Engineering 2022年第2期3卷 171-179页

作者： Aeilke J.Kamphuis Minhhuy Tran Francesco Picchioni Paolo P.Pescarmona Chemical Engineering Group Engineering and Technology Institute Groningen(ENTEG)Faculty of Science and EngineeringUniversity of GroningenNijenborgh 49747AGGroningenthe Netherlands

Herein,we report the application of four amino-tris(phenolate)-based metal complexes incorporating Ti(IV)or Zr(IV)centres(2a-3b)as homogeneous catalysts for the conversion of CO_(2)and epoxides into Cyclic carbonates.The four complexes were synthesised,characterised and then evaluated in combination with tetrabutylammo-nium iodide,bromide or chloride as binary catalytic systems for the reaction of CO_(2)with 1,2-epoxyhexane as epoxide substrate at 12 bar CO_(2)pressure and 90?C for 2 h.The catalytic systems comprising the two Ti(IV)complexes(2a and 2b)showed similar performance.One notable exception was the catalytic system consisting of titanium complex 2b,bearing an axial Cl-ligand,and tetrabutylammonium chloride,which displayed higher catalytic activity compared to other titanium-based systems.Even higher activity was achieved with Zr(IV)complex 3a,bearing an axial isopropoxide ligand,which reached turnover numbers(TON metal)up to 1920 for the reaction of CO_(2)with 1,2-epoxyhexane at 12 bar CO_(2)pressure and 90?C for 2 h.This performance is comparable with that of state-of-the-art catalysts for this reaction.The catalytic system consisting of complex 3a and tetra-butylammonium bromide was explored further by investigating its applicability with a broad substrate scope,achieving quantitative conversion of several epoxides with CO_(2)into cyclic carbonate products at 90?C and 12 bar CO_(2)pressure for 18 h.The selectivity towards the cyclic carbonate products was?98%for all studied terminal epoxides and?80%for all examined cyclohexene-type epoxides.

关键词： CO_(2)fixation Cyclic carbonates Homogeneous catalysis Ti amino-tris(phenolate)complexes Zr amino-tris(phenolate)complexes

Recent advances in the coupling of CO2 and epoxides into Cyclic carbonates under halogen-free condition

在线全文

学校读者我要写书评

暂无评论

Green Chemical Engineering 2020年第2期1卷 82-93页

作者： Feng Zhang Yanyan Wang Xiaochun Zhang Xiangping Zhang Huizhen Liu Buxing Han Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Colloid and Interface and ThermodynamicsCAS Research/Education Center for Excellence in Molecular SciencesInstitute of ChemistryChinese Academy of SciencesBeijing100190PR China School of Chemistry and Chemical Engineering University of Chinese Academy of SciencesBeijing100049PR China State Key Laboratory of Multiphase Complex System Beijing Key Laboratory of Ionic Liquids Clean ProcessInstitute of Process EngineeringChinese Academy of SciencesBeijing100190China

The chemical transformation of CO2 and epoxides into Cyclic carbonates has been receiving much attention and is one of the successful examples for CO2 utilization as carbon resource.Many catalysts containing halide anions have been explored and exhibit excellent catalytic activity.However,halogen salt is generally toxic and corrosive to reactors.From a green chemistry perspective,it is more attractive to develop a halogen-free catalyst with excellent performance.Herein,a review of recent research progress of halogen-free catalysts in the cycloaddition of CO2 and epoxide is presented.According to previous experimental and theoretical works,two possible strategies for achieving the halogen-free process were summarized.The relationship between catalytic activity and catalyst structure,the mechanism of CO2 activation should be both studied deeply combined with experimental results and DFT calculation,which can guide the design of new catalysts and realize halogen-free process under mild reaction conditions.

关键词： Cyclic carbonates Halogen-free catalysts Lewis acid-base Lewis acid-nucleophile Synergistic effect

Synthesis of Cyclic carbonates from Alkenyl and Alkynyl Substrates

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2017年第5期35卷 541-550页

作者： Bo Zou Changwen Hu Key Laboratory of Cluster Science Ministry of Education of ChinaSchool of Chemistry and Chemical Engineering Beo'ing Institute of Technology Beo'ing 100081 China

As an extensively used chemical product,cyclic carbonate was generally synthesized by transesterification,or the cycloaddition of epoxides,diols with CO2.To reduce the production costs and expand the raw materials,alkenyl and alkynyl substrates have caused much attention in the synthesis of Cyclic carbonates,such as olefins,allyl alcohols and propargylic alcohols.Based on the alkenyl substrate,the synthetic process involves a continuous reaction of oxidative carboxylation,with epoxide or halohydrin as an intermediate usually.Therefore,peroxides and nucleophiles （halogens or organic bases） are often necessary in the conversion.Using propargylic alcohols to produce a-alkylidene Cyclic carbonates,noble metal catalysts play crucial roles in alkynyl activation,and organic bases are considered to assist the intramolecular and intermolecular proton transfer and combine CO2 molecular.As the carboxyl sources in products,inorganic carbonates and organic carboxylic acids also have some applications instead of CO2.In this review,we summarized the synthetic routes of Cyclic carbonates from alkenyl and alkynyl substrates in the aspect of catalyst,mechanism and the development tendency.

关键词： Cyclic carbonates CO2 conversion olefins propargylic alcohols

Synthesis of Cyclic carbonates from epoxides or olefins and CO_2 catalyzed by metal-organic frameworks and quaternary ammonium salts

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2013年第1期22卷 130-135页

作者： Olga V. Zalomaeva Nataliya V. Maksimchuk Andrey M. Chibiryaev Konstantin A. Kovalenko Vladimir P. Fedin Bair S. Balzhinimaev Boreskov Institute of Catalysis pr. Akademika Lavrentieva 5 Vorozhtsov Novosibirsk Institute of Organic Chemistry pr Akademika Lavrentieva 9 Nikolaev Institute of Inorganic Chemistry pr. Akademika Lavrentieva 3

Catalytic properties of the metal-organic framework Cr-MIL-101 in solvent-free cycloaddition of CO2 to epoxides to produce cyclic carbon- ates using tetrabutylammonium bromide as co-catalyst have been explored under mild reaction conditions （8 bar CO2, 25 ~C）. Styrene and propylene carbonates were formed with high yields （95% and 82%, respectively）. Catalytic performance of Cr-MIL-101 was compared with other MOFs： Fe-MIL-101, Zn-MOF-5 and HKUST-1, The catalytic properties of different quaternary ammonium bromides, Cr-MIL-101 as well as PW12/Cr-MIL-101 composite material have been assessed in oxidative carboxylation of styrene in the presence of both tert-butyl hydroperoxide and H202 as oxidants at 8-100bar CO2 and 25-80 ~C with selectivity to styrene carbonate up to 44% at 57% substrate conversion.

关键词： carbon dioxide Cyclic carbonates cycloaddition heterogeneous catalysis metal-organic framework oxidative carboxylation quaternary am-monium salts

Conversion of CO2 into Cyclic carbonates under Ambient Conditions Catalyzed by Lanthanide Complexes Bearing a Pentadentate Poly(phenolate) Ligand

在线全文

学校读者我要写书评

暂无评论

Conversion of CO2 into Cyclic Carbonates under Ambient Condi...

Chemo-, Regio-, Stereo-and Enantioselective Transformations of Cyclic carbonates and Beyond

中国化学会·第一届全国二氧化碳资源化利用学术会议

作者： Xiu Xin Haiwen Shan Yaorong Wang Dan Yuan Yingming Yao Key Laboratory of Organic Synthesis of Jiangsu Province College of Chemistry Chemical Engineering and Materials ScienceDushu Lake Campus Soochow University

Carbon dioxide is an ideal C1 resource, because it is abundant, renewable and non-toxic. However, it is thermodynamically stable, which greatly limits its application. Development of suitable catalysts to activate CO is important and challenging task, which has attracted great interest. In our work, a series of homonuclear rare-earth(RE) metal complexes(Y, La, Nd, and Sm) stabilized by N-methylethylenediamine-bridged tris(phenolate) ligands were prepared and structurally characterized, which showed good activity in catalyzing cyclic carbonate synthesis from epoxides and CO. Terminal substrates were transformed into Cyclic carbonates in good yields(49%-99%) at r.t. and 1 atm CO pressure, while disubstituted epoxides were transformed into Cyclic carbonates in preferable yields(92%-99%) at 60-120 oC and 1 atm CO pressure.

关键词： rare earth complex carbon dioxide Cyclic carbonates

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Chemo-, Regio-, Stereo-and Enantioselective Transformations ...

Histidine-catalyzed synthesis of Cyclic carbonates in supercritical carbon dioxide

中国化学会·第一届全国二氧化碳资源化利用学术会议

作者： Wusheng Guo Frontier Institute of Science and Technology (FIST) Xi’an Jiaotong University

Recycling of carbon dioxide into value-added organic molecules and materials has received widespread attention among the chemical communities. Among the most studied transformations that take advantage of the cheap, accessible and renewable nature of CO as a carbon feedstock is its cycloaddition reaction with oxiranes affording cyclic carbonate products. This cycloaddition reaction has a long history, and the development of new, more sustainable synthetic approaches and applications has been an ongoing endeavor.[1] Whereas conventionally these heterocyclic scaffolds found use as non-protic solvents, precursors to polycarbonates, electrolytes and as intermediates towards chemicals such as ethylene glycol. Recently, Cyclic carbonates and related heterocycles find increasing synthetic utility using predominantly transition metal catalysis.[2] In particular, vinyl-substituted Cyclic carbonates have been at the forefront of these developments with decarboxylative approaches being prevalent. The talk will present the recent development of our research on this topic(Scheme 1).[3]

关键词： Cyclic carbonates Decarboxylation Regioselectivity Stereoselectivity Enantioselectivity

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Science China Chemistry 2010年第7期53卷 1566-1570页

作者： QI ChaoRong JIANG HuanFeng School of Chemistry and Chemical Engineering South China University of TechnologyGuangzhou 510640China

The coupling reaction of carbon dioxide with epoxides was investigated using naturally occurring α-amino acids as the catalyst in supercritical carbon dioxide and it was found that L-histidine is the most active catalyst.In the presence of 0.8 mol% of L-histidine at 130°C under 8 MPa of CO_(2),the reaction of carbon dioxide with epoxides proceeded smoothly,affording corresponding Cyclic carbonates in good to excellent yields.

关键词： supercritical carbon dioxide amino acids epoxides Cyclic carbonates

Synthesis of Cyclic carbonates and dimethyl carbonate using CO_(2) as a building block catalyzed by MOF-5/KI and MOF-5/KI/K_(2)CO_(3)

在线全文

学校读者我要写书评

暂无评论

中国化学前沿:英文版 2011年第1期6卷 21-30页

作者： Jinliang SONG Binbin ZHANG Tao JIANG Guanying YANG Buxing HAN Beijing National Laboratory for Molecular Sciences Institute of ChemistryChinese Academy of SciencesBeijing 100190China

The synthesis of Cyclic carbonates or dimethyl carbonate(DMC)using CO_(2) as a building block is a very interesting topic.In this work,we found that the metalorganic framework-5(MOF-5)/KI was an active and a selective catalytic system for the synthesis of Cyclic carbonates from CO_(2) and epoxides,and MOF-5/KI/K_(2)CO_(3) was efficient for the preparation of DMC from CO_(2),propylene,and methanol by a sequential route.The impacts of temperature,pressure,and reaction time length on the reactions were investigated,and the mechanism of the reactions is proposed on the basis of the experimental results.

关键词： carbon dioxide Cyclic carbonates dimethyl carbonate(DMC) metal-organic framework-5(MOF-5) sequential route propylene oxide