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Tuning of interactions between cathode and lithium polysulfide in Li-S battery by rational halogenation

Journal of Energy Chemistry 2020年第10期29卷 147-152页

作者： Samson O.Olanrele Zan Lian Chaowei Si Shuo Chen Bo Li Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016LiaoningChina School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016LiaoningChina Key Laboratory of Functional Inorganic Material Chemistry(Ministry of Education of China) School of Chemistry and Materials ScienceHeilongjiang UniversityHarbin 150080HeilongjiangChina Chemical Sciences Department Mountain Top UniversityOgun StateNigeria

Li-S batteries have aroused intense interests as one of the most promising high-energy-density storage ***,the complex undesired shuttle effect induced by dissolution and diffusion of lithium polysulfide intermediates remains the major setback of this *** modification of carbon cathode through heteroatom-doping is widely accepted as an effective method to inhibit the shuttle effect in Li-S battery ***,using first principle calculations,we systematically examined the interaction between halogenated graphene and lithium polysulfide *** is found that the halogen dopants(F,Cl,Br,I)significantly modify the local electronic structure of adsorption site and further induce a polarization to trap the ***,a concave curve is observed from F to I for lithium polysulfide adsorption rather than a linear *** exceptions demonstrated from iodine dopant is carefully analyzed and attributed to its unique charge ***,boron as second dopant further strengthens the interaction between halogenated graphene and polysulfide *** on halogenation strategy,lithium polysulfide/cathode interactions are tuned in a wide range,which can also be of great importance to accelerate redox reaction in Li-S ***,an effective method by halogenation is verified to regulate the adsorption of lithium polysulfide and also enhance the reaction kinetics of the Li-S battery system.

关键词： Li-S battery halogenation Shuttle effect Co-doping

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Cyclization and halogenation of substituted o-allylphenols with diacetoxyiodobenzene in the presence of iodine or bromine

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Chinese Chemical Letters 2008年第6期19卷 661-664页

作者： Qi Zhong Zhou Chun Lin He Zhen Chu Chen Department of Chemistry Zhejiang University Hangzhou 310027 China

Substituted 2-halomethyl-2,3-dihydrobenzofurans were synthesized in one pot and in mild yield from substituted o-allylphenols with diacetoxyiodobenzene in the presence of 12 or Br2 in dry CH2Cl2 under reflux.

关键词： 2-Halomethyl-2,3-dihydrobcnzofuran Diacetoxyiodobenzene Cyclization halogenation

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Synergy of Anodic Oxidation and Cathodic Reduction Leads to Electrochemical C—H halogenation

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Chinese Journal of Chemistry 2019年第6期37卷 611-615页

作者： Zhilin Zhou Yong Yuan Yangmin Cao Jin Qiao Anjin Yao Jing Zhao Wanqing Zuo Wenjie Chen Aiwen Lei National Research Center for Carbohydrate Synthesis Jiangxi Normal UniversityNanchangJiangxi 330022China College of Chemistry and Molecular Sciences Institute for Advanced Studies (IAS)Wuhan UniversityWuhanHubei 430072China

We herein uncovered an electrochemical C—H halogenation protocol that synergistically combines anodic oxidation and cathodic reduction for C—X bond formation. The reaction was demonstrated under exogenous-oxidant-free conditions. Moreover, this is the first example of activating CBr4, CHBr3, and CCl3Br under electrochemical conditions.

关键词： anodic oxidation cathodic reduction electrochemistry C-H halogenation synthetic methods

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Synthesis,halogenation and structural characterization of (Z)-1-[2-(triphenylstannyl)vinyl]-l-cyclododecanol

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Chinese Journal of Chemistry 1998年第4期16卷 367-376页

作者：黄葵傅芳信潘华德 Department of Chemistry Northeast Normal UniversityChangchunJilin 130024China

Synthesis and characterization of (Z)-1-[2-(triphenylstannyl)vinylj-l-cyclododecanol,c-(CH2)11C(OH)CH=CHSnPh3,are reported,together with its halogenation by I2,Br2 and IC1 to yield derivatives of the types c-(CH2)11C(OH)CH=CHSnPh3_nXn (n=1,2; X=I,Br,Cl,respectively).The molecular structures of two compounds have been determined by X-ray diffraction *** tin atom exhibits a distorted tetrahedral geometry in the crystal of (Z)-1-[2-(triphenylstannyl)vinyl]-1-cyclododecanol,but a trigonal bipyramidal geometry in the monoiodo-derivative (Z)-1-[2-(diphenyliodo-stannyl)vinyl]-l-cyclododecanol and other derivatives,in which significant intramolecular coordinative interaction HO→Sn is *** the formation of a five-membered tin containing ring is significant for their antitumour activities.

关键词： Organotin halogenation crystal structures

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Environmentally Benign Electrophilic halogenation of Naphthalenes by H<sub>2</sub>O<sub>2</sub>—Alkali Metal Halides in An Aqueous Cationic Micellar Media

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International Journal of Organic Chemistry 2012年第3期2卷 254-261页

作者： Kancharla Rajendar Reddy Sariah Sana Kusampally Uppalaiah Kamatala Chinna Rajanna Puppala Veerasomaiah Department of Chemistry Osmania University Hyderabad-500 007 A. P (India)

An efficient and greener protocol for the synthesis of 1-halo-naphthols by the action of hydrogen peroxide and alkali metal halides in aqueous micellar media is been described in the present work. This is an environmentally clean and safe procedure, which involved insitu generation of the active halogen in presence of alkali halides. Cationic surfactants such as cetyltrimethylammoniumbromide (CTAB) and cetyltrimethylammoniumchloride (CTAC) were found to facilitate efficiency of halogenation in aqueous media.

关键词： Green Chemistry halogenation Synthesis 1-halo-naphthols Alkali Metal Halides 2-Naphthols Aqueous Micellar Media CTAB (Cetyl Trimethyl Ammonium Bromide) CTAC (Cetyl Trimethyl Ammonium Chloride)

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Model for a UV Laser Based Local Polymer Surface halogenation Process Using a Gaseous Precursor

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Modeling and Numerical Simulation of Material Science 2014年第1期4卷 14-19页

作者： Simon Kibben BIAS—Bremer Institut für Angewandte Strahltechnik GmbH Bremen Germany

An analytical model describing the physical relations of a UV-based process for halogenation of polymeric surfaces is presented. The process allows, depending on the parameters, a local halogenation with sharp edges at the interfaces to areas where no halogenation is desired. This is achieved via a nonreactive halogen-containing gaseous precursor and a UV source providing photons which dissociate the precursor photolytically. Thus, only where the UV photons affect the precursor, halogens are generated and the polymer is being halogenated.

关键词： Local Surface halogenation Polymer Modification UV-Laser-Based Surface Modification

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TEMPO-Regulated Regio-and Stereoselective Cross-Dihalogenation with Dual Electrophilic X^(+) Reagents

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Chinese Journal of Chemistry 2021年第11期39卷 3004-3010页

作者： Yi Kong Tongxiang Cao Shifa Zhu Key Laboratory of Functional Molecular Engineering of Guangdong Province School of Chemistry and Chemical EngineeringSouth China University of TechnologyGuangzhouGuangdong510640 China

A TEMPO catalyzed cross-dihalogenation reaction was established via redox-regulation of the otherwise complex system of dual electrophilic X+***,the ICl,BrCl,I_(2) and Br_(2) were generated in-situ,which enabled high regio-or stereoselective access to a myriad of iodochlorination,bromochlorination and homo-dihalogenation products with a wide spectrum of *** its mild conditions and operational simplicity,this method could enable wide applications in organic synthesis,which was exemplified by divergent synthesis of two *** mechanistic investigations via radical clock reaction,pinacol ring expansion and Hammett experiments were conducted,which confirmed the intermediacy of halonium *** addition,a dynamic catalytic model based on the versatile catalytic role of TEMPO was proposed to explain the selective outcomes.

关键词： halogenation Organocatalysis Electrophilic addition Redox-regulation Alkynes

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An approach to synthesis of(Z)-2-chloro-1,3-diarylpropen-1-ones by Vilsmeier reagent(bis-(trichloromethyl)carbonate/DMF)

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Chinese Chemical Letters 2011年第12期22卷 1395-1398页

作者： Yi Yi Weng Jian Jun Li Wei Ke Su Key Laboratory of Pharmaceutical Engineering of Ministry of Education College of Pharmaceutical Sciences Zhejiang University of Technology Hangzhou 310014 China

A series of（Z）-2-chloro-1,3-diarylpropen-1-ones were unexpectedly synthesized in moderate yields by treatment of easily available 2,3-epoxy-1,3-diarylpropan-1-ones with Vilsmeier reagent,which was derived from bis（trichloromethyl） carbonate（BTC, triphosgene） and DMF.A possible mechanism was also proposed,where sequential ring-opening,halogenation and elimination reactions were involved.

关键词： Ring-opening halogenation Vilsmeier reagent Bis-(trichloromethyl)carbonate (Z)-2-Chloro-1 3-diaryl-2-enones

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Synthesis and Evaluation of Photophysical Properties of C-3 Halogenated Derivatives of 2-Phenylimidazo[1,2-a]pyridine

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Chinese Journal of Chemistry 2022年第19期40卷 2313-2328页

作者： Hong Chen Yanyan Wang Qingjie Liu Yanchun Guo Shuxia Cao Yufen Zhao College of Chemistry Zhengzhou UniversityZhengzhouHenan450001 China Institute of Drug Discovery Technology Ningbo UniversityNingboZhejiang315211 China

A CuX-mediated regioselective halogenation reaction of 2-phenylimidazo[1,2-a]pyridine in the presence of oxygen is introduced in this *** reaction provides an effective method for the production of C-3 halogenated 2-phenylimidazo[1,2-a]pyridines with a yield of up to 96%.A plausible mechanism for the formation of title compounds via 2-phenylimidazo[1,2-a]pyridine–CuX complex intermediate is *** structure of representative compounds is established by the single crystal XRD *** electronic structure,corroborated by Hirshfeld surface analysis and DFT calculations,rationalizes characters of relevant absorptions and emission as well as large Stokes shifts.

关键词： Imidazole[1,2-a]lpyridine halogenation Cuprous halide DFT calculations Photophysical properties

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A Facile Synthetic Approach to 3-Halo-4-substituted-l,5-dihydro-4H-1,2,4-triazoline-5-thiones Based on Retro-Michael Addition

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Chemical Research in Chinese Universities 2017年第4期33卷 587-593页

作者： TIAN He LIU Yuqiang LI Xingwei XIE Yafei LIU Changying WANG Jianwu ZHAO Guilong School of Chemistry and Chemical Engineering Shandong University Jinan 250100 P. R. China Eanjin Key Laboratory of Molecular Design and Drug Discovery Eanjin Institute of Pharmaceutical Research Tianjin 300193 P. R. China

A facile 3-step synthetic approach to 3-halo-4-substituted-l,5-dihydro-4H-1,2,4-triazolme-5-thiones （la--lk） from corresponding unhalogenated 8a---8i was developed based on the strategy of retro-Michael addition, with the key steps being regioselective S-alkylation of compounds 8a-8i with ethyl 3-iodopropionate（12c） and alkaline cleavage of the propionate protecting group via retro-Michael addition. The synthetic approach was characterized by simplicity of operation and wide substrate scope.

关键词： Synthetic approach Protecting group Triazole halogenation Regioselectivity Retro-Michael addition

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