检索结果-南通市图书馆

Chinese Chemical Letters 2024年第4期35卷 142-146页

作者： Lang Gao Cen Zhou Rui Wang Feng Lan Bohang An Xiaozhou Huang Xiao Zhang Fujian Key Laboratory of Polymer Science Fujian Provincial Key Laboratory of Advanced Materials Oriented Chemical EngineeringCollege of Chemistry and Materials ScienceFujian Normal UniversityFuzhou 350007China Fujian Engineering and Research Center of New Chinese Lacquer Materials College of Materials and Chemical EngineeringMinjiang UniversityFuzhou 350108China

Inverse vulcanized polymers(IVPs) that generated from elemental sulfur and smaller amounts of alkenes have found broad promising applications such as cathode materials for Li-S batteries, dynamic and repairable materials, optics applications, and metal sorption. However, their exploration in organic synthesis is still unprecedented. Here we first report the application of inverse vulcanized polymers in catalysis for organic transformations. A biomass-derived inverse vulcanized polymer(IVP-EAE) is found to be capable of catalyzing cross-coupling reactions in a transition-metal-free fashion under visible light.This method allows the direct C–H functionalization of pyrroles and N-arylacrylamides with(hetero)aryl halides, respectively, leading to the formation of two sets of structurally important scaffolds including pyrrole-containing biaryls and 3,3-disubstituted oxindoles with high selectivity. We anticipate this study will not only unveil the new potential of IVPs, but also offer a distinct type of catalysts for organic transformations.

关键词： Cross coupling Inverse vulcanized polymers metal free Photocatalyst Visible light

Oxidative lactonization of C(sp^(3))–H bond in methyl aromatic alcohols enabled by proton-coupled electron transfer

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2022年第8期65卷 1526-1531页

作者： Shanyi Chen Qihong Lai Chao Liu Hui Liu Mingqiang Huang Shunyou Cai Fujian Provincial Key Laboratory of Modern Analytical Science and Separation Technology School of ChemistryChemical Engineering and EnvironmentMinnan Normal UniversityZhangzhou 363000China Guangdong Provincial Key Laboratory of Chemical Genomics School of Chemical Biology and BiotechnologyShenzhen Graduate SchoolPeking UniversityShenzhen 518055China

Direct functionalization of inert C(sp^(3))–H bonds in pharmaceutically significant compounds is very important in modern synthetic organic chemistry.In this article,we disclose a practical and efficient method for the oxidative lactonization of benzylic C(sp^(3))–H bonds enabled by the synergistic interactions of organic dye-type rose bengal,n-Bu_(4)N∙Br,O_(2) and Na_(2)HPO_(4) under visible light irradiation.This reaction does not require transition metal catalysts or strong oxidants.A range of structurally diverse phthalides has been synthesized with excellent selectivity and high functional group compatibility.The late-stage application of this reaction to the preparation of structurally complex phthalides demonstrates its synthetic utility.

关键词： photoredox catalyst metal free singlet oxygen bromine radical dehydrogenated lactonization

Pyrenetetraone-based covalent organic framework as an effective electrocatalyst for oxygen reduction reaction

在线全文

学校读者我要写书评

暂无评论

Nano Research 2022年第5期15卷 3907-3912页

作者： Paloma Garcia-Arroyo Emiliano Martinez-Perinan Jorge J.Cabrera-Trujillo Elena Salagre Enrique G.Michel Jose I.Martinez Encarnacion Lorenzo Jose L.Segura Departamento de Quimica Organica I Facultad de CC.QuimicasUniversidad Complutense de Madrid28040 MadridSpain Departamento de Quimica Analitica y Analisis Instrumental Facultad de CienciasUniversidad Autónoma de Madrid28049 MadridSpain Departamento de Fisica de la Materia Condensada Universidad Autónoma de Madrid28049 MadridSpain Condensed Matter Physics Center(IFIMAC) Universidad Autónoma de Madrid28049 MadridSpain Departamento de Nanoestructuras SuperficiesRecubrimientos y Astrofisica MolecularInstituto de Ciencia de Materiales de Madrid(ICMMCSIC)28049 MadridSpain Instituto Madrileno de Estudios Avanzados en Nanociencia(IMDEA-Nanociencia) 28049 MadridSpain Institute for Advanced Research in Chemical Sciences(IAdChem) Universidad Autonoma de Madrid28049 MadridSpain

A novel porous and crystalline two-dimensional(2D)electrochemically active covalent organic framework(COF)based on ortho-quinone units has been prepared as an innovative approach towards the development of organic cathode materials with multiple redox sites as an efficient electrocatalyst for the oxygen reduction reaction(ORR).In contrast with most of the previously reported COFs as electrocatalysts for the ORR,the electrocatalytic application of this material towards ORR has been investigated without adding any metal or conductive supporting material and avoiding any additional carbonization step.Additionally,the electrochemical properties of the COF material have been compared with two analogue amorphous frameworks with similar chemical composition,which points out the important role of the enhanced crystallinity and porosity of the COF network in its superior performance as an electrocatalyst towards ORR.

关键词： electrocatalysis oxygen reduction reaction metal free pyrenetetraone covalent organic framework

Simple and Efficient Aromatic C−H Oxazolination

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

Precision Chemistry

Precision Chemistry 2023年第5期1卷 316-325页

作者： Qiu Shi Yu Huang Wenbo H.Liu School of Chemistry Sun Yat-sen UniversityGuangzhou 510006China

Aromatic oxazolines are versatile in organic synthesis as directing groups,ligands,and protected carboxylic acids.Developing efficient approaches to oxazoline from an aromatic C−H bond is more desirable compared to the established protocols from carboxylic acid and its equivalents.Herein,a simple and efficient aromatic C−H oxazolination with broad substrate scope is described.By employing this transformation as an enabling step,diversity-oriented synthesis of functionalized arenes and target-oriented synthesis of four drugs were accomplished.Mechanistic experiments suggest that this aromatic oxazolination is an electrophilic aromatic substitution.It is anticipated that this transformation will find applications in aromatic C−H functionalization with oxazoline either as a removable directing group or as a masked carboxylic acid.

关键词： aromatic C−H functionalization oxazolines metal free aromatic electrophilic substitution late-stage functionalization

Alcohols controlled selective radical cyclization of 1,6-dienes under mild conditions

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

Chinese Chemical Letters 2020年第12期31卷 3267-3270页

作者： Fu-Hua Qin Xun-jie Huang Yi Liu Hongze Liang Qiang Li Zhong Cao Wen-Ting Wei Wei-Min He State Key Laboratory Base of Novel Functionat Materials and Preparation Science School of Materil Science and Chemical EngineeringNingbo UniversityNingbo 315211China Institution of Functional Organic Molecules and Materiaks School of Chemistry and Chemical EngineeringLiaocheng UniversityLiaocheng 252059China Hunan Provincial Key Labortory of Materials Protectron for Electric Power and Transportation Changsha University of Science and TechnologyChangsha 410114China

An efficient procedure for the selective preparation of hydroxy-,carbonyl-and acetal-containing 2-pyrrolidinones has been developed through radical cyclization of 1,6-dienes initiated byα-C(sp3)-H functionalization of alcohols.This protocol could be conducted at catalyst-free conditions at relatively low temperature(80℃)by employing commercially available tert-butyl peroxybenzoate(TBPB)as the oxidant.

关键词： Green chemistry metal free Cyclization Alcohol Pyrrolidinone

Phosphate modified carbon nanotubes for oxidative dehydrogenation of n-butane

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2016年第3期25卷 349-353页

作者： Yajie Zhang Rui Huang Zhenbao Feng Hongyang Liu Chunfeng Shi Junfeng Rong Baoning Zong Dangsheng Su University of Science and Technology of China Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences Sinopec Research Institute of Petroleum Processing

Catalytic performance of phosphate-modified carbon nanotube（PoCNT） catalysts for oxidative dehydrogenation（ODH） of n-butane has been systematically investigated. The Po CNT catalysts are characterized by SEM, TEM, XPS and TG techniques. We set the products selectivity as a function of butane conversion over various phosphate loading, and it is found that the PoCNT catalyst with the 0.8% phosphate weight loading（0.8PoCNT） exhibits the best catalytic performance. When the phosphate loading is higher than 0.8 wt%, the difference of catalytic activity among the PoCNT catalysts is neglectable. Consequently, the ODH of n-butane over the 0.8PoCNT catalyst is particularly discussed via changing the reaction conditions including reaction temperatures, residence time and n-butane/O;ratios. The interacting mechanism of phosphate with the oxygen functional groups on the CNT surface is also proposed.

关键词： Carbon nanotube Phosphate modification Oxidative dehydrogenation n-Butane metal free

Synthesis of Oxindoles by metal-free Oxidative Arylalkylation of Activated Alkenes Involving a Tandem C(sp3)-H/C(sp2)-H Activation/Cyclization Process

在线全文

学校读者我要写书评

暂无评论

Synthesis of Oxindoles by Metal-free Oxidative Arylalkylatio...

Synthesis of C60-Fused Tetrahydrocarbazole/dibenzothiophene/benzothiophene and dibenzofuran Derivatives via metal free Oxidative Dehydrogenative Carboannulation

中国化学会全国第十一届有机合成化学学术研讨会

作者： Shucheng Wang Xuhu Huang Bowen Li Zemei Ge Xin Wang Runtao Li State key Laboratory of Nature and Biomimetic Drugs School of Pharmaceutical SciencesPeking University

In recent years,several groups reported the synthesis oxindoles via C(sp)-C(sp)bond formation reactions involving free-radical-initiated sp-hybridized C-H bond activation processes.But examples involving the arylalkylation of activated alkenes through metal-free oxidative reactions are scarce.Herein,we have developed a novel metal-free tandem oxidative cyclization reaction of activated alkenes mediated by xanthates.This method possesses remarkable advantages:good to excellent yields;self-regulating,safe,and highly scalable;electron-donating,electron-withdrawing and heteroatom-containing groups can be tolerated.

关键词： oxindoles metal free xanthate radical

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

Synthesis of C60-Fused Tetrahydrocarbazole/dibenzothiophene/...