Chemical Synthesis最新文献_第9页

Fundamentals of the catalytic conversion of methanol to hydrocarbons 甲醇催化转化为碳氢化合物的基本原理

Chemical Synthesis Pub Date : 1900-01-01 DOI: 10.20517/cs.2022.26

Zhaohui Liu, Jianfeng Huang

{"title":"Fundamentals of the catalytic conversion of methanol to hydrocarbons","authors":"Zhaohui Liu, Jianfeng Huang","doi":"10.20517/cs.2022.26","DOIUrl":"https://doi.org/10.20517/cs.2022.26","url":null,"abstract":"For more than four decades, the methanol-to-hydrocarbons (MTH) reaction has been a successful route to producing valuable fuels and chemicals from non-petroleum feedstocks. This review provides the most comprehensive summary to date of recent research concerning the mechanistic fundamentals of this important reaction, covering different reaction stages. Mechanisms that have been proposed to explain the initial C-C bond formation during the induction stage of the MTH reaction are introduced, including the methoxymethyl cation, Koch carbonylation, carbene and methane-formaldehyde processes. At present, there is no consensus regarding these hypothetical mechanisms as a consequence of the limited amount of conclusive experimental evidence. The steady state of the MTH reaction is also examined with a focus on the widely accepted indirect hydrocarbon pool mechanism and the dual cycle concept that provides a mechanistic basis for the effects of zeolite structures and reaction conditions on product distribution. In the following section, advanced characterization techniques capable of providing new insights into the formation of coke species during the MTH reaction and innovative approaches effectively inhibiting coke formation are introduced. Finally, a summary is provided and perspectives on current challenges and the future development of this area are presented.","PeriodicalId":381136,"journal":{"name":"Chemical Synthesis","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121560265","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Pd-H/Lewis base cooperative catalysis confers asymmetric allylic alkylation of esters atom-economy and stereodivergence Pd-H/路易斯碱协同催化实现了酯类的不对称烯丙基烷基化，原子经济性和立体发散性

Chemical Synthesis Pub Date : 1900-01-01 DOI: 10.20517/cs.2023.05

M. Sayed, Zhi-Yong Han, L. Gong

{"title":"Pd-H/Lewis base cooperative catalysis confers asymmetric allylic alkylation of esters atom-economy and stereodivergence","authors":"M. Sayed, Zhi-Yong Han, L. Gong","doi":"10.20517/cs.2023.05","DOIUrl":"https://doi.org/10.20517/cs.2023.05","url":null,"abstract":"The construction of Csp 3 -Csp 3 with high stereoselectivity, even in a stereodivergent way, has been a long-standing theme in organic synthesis. As an atom-and step-economic transformation, transition metal hydride-mediated allylic alkylation of enolizable carbonyl compounds with readily available allenes, alkynes or 1,3-dienes as the unconventional allylating reagents has recently emerged as a promising protocol for the stereoselective construction of Csp 3 -Csp 3 bonds with high efficiency. Due to their less enolizability and weak nucleophilicity, simple esters remain challenging substrates for these coupling reactions. On the other hand, the strategy of metal/organo combined catalysis has recently emerged as one of the wide-ranging disciplines and powerful tools in asymmetric synthesis. Considering the recent achievements of chiral Lewis base catalysis in catalytic asymmetric α - functionalization of esters through a “rebound” mechanism, the cooperative combination of chiral Lewis bases and metal hydride catalysis may offer great opportunities to the aforementioned chemistry. Recently, the groups of Snaddon and Zi have made remarkable progresses in this area through palladium and chiral Lewis base cooperative catalysis.","PeriodicalId":381136,"journal":{"name":"Chemical Synthesis","volume":"122 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133014510","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Customization of functional MOFs by a modular design strategy for target applications 通过模块化设计策略为目标应用定制功能性MOFs

Chemical Synthesis Pub Date : 1900-01-01 DOI: 10.20517/cs.2022.15

Yaguang Peng, Q. Tan, Hongliang Huang, Qinggong Zhu, Xinchen Kang, Chongli Zhong, B. Han

{"title":"Customization of functional MOFs by a modular design strategy for target applications","authors":"Yaguang Peng, Q. Tan, Hongliang Huang, Qinggong Zhu, Xinchen Kang, Chongli Zhong, B. Han","doi":"10.20517/cs.2022.15","DOIUrl":"https://doi.org/10.20517/cs.2022.15","url":null,"abstract":"Herein, we propose a versatile “functional modular assembly” strategy for customizing MOFs that allows installing the desired functional unit into a host material. The functional unit could be switched according to different applications. MOF-808, a highly stable Zr-MOF containing dangling formate groups, was selected as a host material for demonstration. Functional molecules with carboxyl connectors can be directly inserted into MOF-808 to form functional modular MOFs (FM-MOFs) through single substitution, while for those without carboxyl connectors, a pre-designed convertor was grafted firstly followed by the functional molecules in a stepwise manner. A series of tailor-made FM-MOFs were generated and show excellent performance toward different applications, such as adsorption, catalysis, fluorescent sensing, electrochemistry, and the control of surface wettability. On the other hand, the functional units on the FM-MOFs can switch freely and completely via full interconversion, as well as partly to construct multivariate MOFs (MTV-MOFs). Therefore, this strategy provides a benchmark for rapid customization of functional MOFs for diverse applications that can realize the rapid modular design of materials.","PeriodicalId":381136,"journal":{"name":"Chemical Synthesis","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133657229","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Selenium confined in ZIF-8 derived porous carbon@MWCNTs 3D networks: tailoring reaction kinetics for high performance lithium-selenium batteries 硒限制在ZIF-8衍生多孔carbon@MWCNTs三维网络:定制反应动力学高性能锂硒电池

Chemical Synthesis Pub Date : 1900-01-01 DOI: 10.20517/cs.2022.04

Hongyan Li, C. Li, Yingying Wang, Ming‐Hui Sun, Wenda Dong, Yu Li, Bao‐Lian Su

{"title":"Selenium confined in ZIF-8 derived porous carbon@MWCNTs 3D networks: tailoring reaction kinetics for high performance lithium-selenium batteries","authors":"Hongyan Li, C. Li, Yingying Wang, Ming‐Hui Sun, Wenda Dong, Yu Li, Bao‐Lian Su","doi":"10.20517/cs.2022.04","DOIUrl":"https://doi.org/10.20517/cs.2022.04","url":null,"abstract":"Lithium-selenium battery is nowadays a highly competing technology to the commercial Li-ion battery because it has a high volumetric capacity of 3253 mAh cm-3 and gravimetric capacity of 675 mAh g-1. However, the practical application of lithium-selenium (Li-Se) batteries is impeded by the shuttle effect of the soluble polyselenides during the cycling process. Herein, we report the in situ growth and pyrolysis of the metal-organic framework zeolitic imidazolate framework-8 (ZIF-8) on three-dimensional (3D) interconnected highly conductive multiwalled carbon nanotubes (MWCNTs). The obtained composites are used to anchor Se for advanced Li-Se batteries. Compared with the isolated ZIF-8 derived microporous carbon, our synthesized ZIF-8 derived porous carbon@MWCNTs (ZIF-8-C@MWCNTs) 3D highly conductive networks facilitate lithium ion diffusion and electron transportation. The particle size of ZIF-8 crystals has an important impact on the battery performance. By adjusting the particle size of ZIF-8, the electrochemical reaction kinetics in ZIF-8-C@MWCNTs 3D networks can be tuned. The optimized particle size of ZIF-8 around 300-500 nm coated on MWCNTs composite achieves an excellent initial discharge capacity of 756 mAh g-1 and a stabilized capacity of 468 mAh g-1 at 0.2 C after 200 cycles. Combining the 3D MWCNTs with the appropriate size of ZIF-8 derived microporous carbon particles could highly improve the performance of the Li-Se battery. This work provides significant guidance for further structural design and host particle size selection for high-performance Li-Se batteries.","PeriodicalId":381136,"journal":{"name":"Chemical Synthesis","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115612834","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Press statement: Vivian Wing-Wah YAM appointed president of IOCD 新闻声明:任永华获委任为国际奥委会主席

Chemical Synthesis Pub Date : 1900-01-01 DOI: 10.20517/cs.2022.06

S. Matlin

引用次数: 0

Boosting VOCs elimination by coupling different techniques 通过不同技术的结合促进VOCs的消除

Chemical Synthesis Pub Date : 1900-01-01 DOI: 10.20517/cs.2022.10

Rebecca El Khawaja, S. Veerapandian, Rim Bitar, N. De Geyter, R. Morent, N. Heymans, G. De Weireld, T. Barakat, Yang Ding, G. Abdallah, S. Sonar, A. Löfberg, Jean‐Marc Giraudon, C. Poupin, R. Cousin, F. Cazier, D. Dewaele, P. Genevray, Y. Landkocz, C. Méausoone, Nour Jaber, D. Courcot, S. Billet, J. Lamonier, Bao‐Lian Su, S. Siffert

{"title":"Boosting VOCs elimination by coupling different techniques","authors":"Rebecca El Khawaja, S. Veerapandian, Rim Bitar, N. De Geyter, R. Morent, N. Heymans, G. De Weireld, T. Barakat, Yang Ding, G. Abdallah, S. Sonar, A. Löfberg, Jean‐Marc Giraudon, C. Poupin, R. Cousin, F. Cazier, D. Dewaele, P. Genevray, Y. Landkocz, C. Méausoone, Nour Jaber, D. Courcot, S. Billet, J. Lamonier, Bao‐Lian Su, S. Siffert","doi":"10.20517/cs.2022.10","DOIUrl":"https://doi.org/10.20517/cs.2022.10","url":null,"abstract":"Volatile Organic Compounds (VOCs) are known to be hazardous and harmful to human health and the environment. In mixtures or during repeated exposures, significant toxicity of these compounds in trace amounts has been revealed. In vitro air-liquid interface approaches underlined the interest in evaluating the impact of repeated VOC exposure and the importance of carrying out a toxicological validation of the techniques in addition to the standard chemical analyses. The difficulties in sampling and measuring VOCs in stationary source emissions are due to both the complexity of the mixture present and the wide range of concentrations. The coupling of VOC treatment techniques results in efficient systems with lower operating energy consumption. Three main couplings are outlined in this review, highlighting their advantages and relevance. First, adsorption-catalysis coupling is particularly valuable by using adsorption and catalytic oxidation regeneration initiated, for example, by selective dielectric heating. Then, several key aspects of the plasma catalysis process, such as the choice of catalysts suitable for the non-thermal plasma (NTP) environment, the simultaneous removal of different VOCs, and the in situ regeneration of the catalyst by NTP exposure, are discussed. The adsorption-photocatalysis coupling technology is also one of the effective and promising methods for VOC removal. The VOC molecules strongly adsorbed on the surface of the photocatalyst can be directly oxidized by the photogenerated hole on the photocatalyst (e.g., TiO2).","PeriodicalId":381136,"journal":{"name":"Chemical Synthesis","volume":"272 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131512382","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Lysine-modulated synthesis of enzyme-embedded hydrogen-bonded organic frameworks for efficient carbon dioxide fixation 赖氨酸调节的酶包埋氢键有机框架的合成，用于有效的二氧化碳固定

Chemical Synthesis Pub Date : 1900-01-01 DOI: 10.20517/cs.2022.28

Boyu Zhang, Jiafu Shi, Ziyi Chu, Jiaxu Zhang, Zhenhua Wu, Dong Yang, Hong Wu, Zhongyi Jiang

{"title":"Lysine-modulated synthesis of enzyme-embedded hydrogen-bonded organic frameworks for efficient carbon dioxide fixation","authors":"Boyu Zhang, Jiafu Shi, Ziyi Chu, Jiaxu Zhang, Zhenhua Wu, Dong Yang, Hong Wu, Zhongyi Jiang","doi":"10.20517/cs.2022.28","DOIUrl":"https://doi.org/10.20517/cs.2022.28","url":null,"abstract":"Carbonic anhydrase (CA) is an important carbon fixation enzyme. Immobilization of CA can expand its application in the realm of adsorption, catalysis, and so on. As a typical metal-free framework, hydrogen-bonded organic frameworks (HOFs) featuring mild synthesis process, exquisite framework structure and good enzyme compatibility have been used for enzyme embedding. However, the catalytic performance of CA-embedded HOFs (CA@HOFs) is limited by the micropore size of HOFs and the slow adsorption of CO2. Herein, CA@Lys-HOF-1 was synthesized by introducing lysine (Lys), a basic amino acid, during the coprecipitation of CA and HOFs for CO2 fixation. The addition of Lys enlarged the average pore size of HOF-1 from 1.8 to 3.2 nm, whereas the introduced -NH2 groups increased the initial adsorption of CO2 from 0.55 to 1.21 cm3 g-1. Compared to CA@HOF-1, the activity of CA@Lys-HOF-1 was enhanced by 71.25%, and the corresponding production of CaCO3 was enhanced by 12.7%. After eight reaction cycles, CA@Lys-HOF-1 still maintained an output of 9.97 mg of CaCO3 every 5 min, 83.7% of the initial production. It is hoped that the CA@Lys-HOF-1 reported offers a platform for efficient and continuous fixation of CO2.","PeriodicalId":381136,"journal":{"name":"Chemical Synthesis","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114247490","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Acyl transfer-enabled catalytic asymmetric Michael addition of α-hydroxy-1-indanones to nitroolefins 酰基转移催化α-羟基-1-吲哚酮与硝基烯烃的不对称Michael加成反应

Chemical Synthesis Pub Date : 1900-01-01 DOI: 10.20517/cs.2022.35

引用次数: 0

The recent advances in the contribution of chiral triarylmethanes and tetraarylmethanes with organocatalysts 手性三芳基甲烷和四芳基甲烷用有机催化剂的贡献的最新进展

Chemical Synthesis Pub Date : 1900-01-01 DOI: 10.20517/cs.2023.11

Zhengyu Han, Ruizhi Liu, Hai Huang

{"title":"The recent advances in the contribution of chiral triarylmethanes and tetraarylmethanes with organocatalysts","authors":"Zhengyu Han, Ruizhi Liu, Hai Huang","doi":"10.20517/cs.2023.11","DOIUrl":"https://doi.org/10.20517/cs.2023.11","url":null,"abstract":"Chiral triarylmethane skeleton is an important structural unit of many known compounds that are widely applied in organic functional materials and pharmaceuticals. Thus, the efficient construction of this class of compounds has attracted intensive attention from chemists. There are two main difficulties in synthesizing this type of compound: (i) the steric resistance of molecular structures would make it hard to be constructed; (ii) there are three similar aryl groups on the stereocenter, which is difficult to achieve stereo-identification. At present, the most common strategy is to introduce the third aryl group into a diarylmethane framework through the asymmetric Friedel-Crafts reaction or addition reaction of electron-rich arenes, so as to construct chiral triarylmethanes. In this review, we summarized the recent developments in the construction of various chiral triarylmethanes and chiral tetraarylmethanes from easily accessible compounds under organocatalytic conditions. This article describes based on the types of electrophilic reagents, mainly including quinone methides, indole imine methides, and azadienes. At the same time, we also emphasize the mechanism of each representative reaction, which might enlighten the future development of this field.","PeriodicalId":381136,"journal":{"name":"Chemical Synthesis","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129385990","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Host-guest assemblies for improved photothermal cancer therapy 改进光热癌症治疗的主客组合

Chemical Synthesis Pub Date : 1900-01-01 DOI: 10.20517/cs.2022.45

Xiaohuan Sun, Qianyun Ye, Jinfeng Zhou, Jie Han, Rong‐Rong Guo

{"title":"Host-guest assemblies for improved photothermal cancer therapy","authors":"Xiaohuan Sun, Qianyun Ye, Jinfeng Zhou, Jie Han, Rong‐Rong Guo","doi":"10.20517/cs.2022.45","DOIUrl":"https://doi.org/10.20517/cs.2022.45","url":null,"abstract":"Photothermal cancer therapy has attracted plenty of attention in the last decades due to its promising efficacy, spatiotemporal control, negligible drug resistance, etc. However, to achieve widespread clinical application, the enhancement of curative effect and the minimization of side effect still need be concerned about in the field of photothermal therapy. Host-guest assemblies, constructed by the inclusion of small molecular guests into macrocyclic hosts through non-covalent interactions, are featured with unique microenvironment and flexible, dynamic nature. On the basis of the abovementioned advantages, host-guest assemblies show great potential in photothermal therapy. However, to the best of our knowledge, the endeavors of host-guest assemblies-based photothermal therapy have not been systematically discussed. Hence, to benefit the design of advanced host-guest assembly-based photothermal agents and promote the development of photothermal therapy, in this review, the major achievements of host-guest assemblies in photothermal cancer therapy, including the enhancement of photothermal conversion efficiency, the improvement of targeted distribution in tumor site, and the superiority of constructing photothermal therapy-derived multimodal synergistic therapy, are discussed. In addition, the future perspectives on host-guest assemblies-based photothermal therapy are outlined.","PeriodicalId":381136,"journal":{"name":"Chemical Synthesis","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128929858","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1