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C-H bond activation of propane on Ga_(2)O_(2)^(2+) in Ga/H-ZSM-5 and its mechanistic implications
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作者 Zhaoqi Zhao Yunzhu Zhong +1 位作者 Xiaoxia Chang Bingjun Xu 《Chinese Journal of Catalysis》 SCIE CAS CSCD 2024年第9期32-43,共12页
Propane dehydrogenation(PDH)on Ga/H-ZSM-5 catalysts is a promising reaction for propylene production,while the detail mechanism remains debatable.Ga_(2)O_(2)^(2+) stabilized by framework Al pairs have been identified ... Propane dehydrogenation(PDH)on Ga/H-ZSM-5 catalysts is a promising reaction for propylene production,while the detail mechanism remains debatable.Ga_(2)O_(2)^(2+) stabilized by framework Al pairs have been identified as the most active species in Ga/H-ZSM-5 for PDH in our recent work.Here we demonstrate a strong correlation between the PDH activity and a fraction of Ga_(2)O_(2)^(2+) species corresponding to the infrared GaH band of higher wavenumber(GaHHW)in reduced Ga/H-ZSM-5,instead of the overall Ga_(2)O_(2)^(2+) species,by employing five H-ZSM-5 supports sourced differently with comparable Si/Al ratio.This disparity in Ga_(2)O_(2)^(2+) species stems from their differing capacity in completing the catalytic cycle.Spectroscopic results suggest that PDH proceeds via a two-step mechanism:(1)C-H bond activation of propane on H-Ga_(2)O_(2)^(2+) species(rate determining step);(2)β-hydride elimination of adsorbed propyl group,which only occurs on active Ga_(2)O_(2)^(2+) species corresponding to GaHHW. 展开更多
关键词 Propane dehydrogenation Ga_(2)O_(2)^(2+) activation of c-h bond Ga species
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A Mechanistic Switch in C-H Bond Activation by Elusive Fe^(V)(O)(TAML)Reaction Intermediate:A Theoretical Study 被引量:1
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作者 Anran Zhou Zhiqiang Fu +2 位作者 Xuanyu Cao Yufen Zhao Yong Wang 《Chinese Journal of Chemical Physics》 SCIE EI CAS CSCD 2022年第2期383-389,I0032-I0064,I0004,共41页
The divergent behavior of C-H bond oxidations of aliphatic substrates compared to those of aromatic substrates shown in Gupta’s experiment was mechanistically studied herein by means of density functional theory calc... The divergent behavior of C-H bond oxidations of aliphatic substrates compared to those of aromatic substrates shown in Gupta’s experiment was mechanistically studied herein by means of density functional theory calculations.Our calculations reveal that such difference is caused by different reaction mechanisms between two kinds of substrates(the aliphatic cyclohexane,2,3-dimethylbutane and the aromatic toluene,ethylbenzene and cumene).For the aliphatic substrates,C-H oxidation by the oxidant Fe^(V)(O)(TAML)is a hydrogen atom transfer process;whereas for the aromatic substrates,C-H oxidation is a proton-coupled electron transfer(PCET)process with a proton transfer character on the transition state,that is,a proton-coupled electron transfer process holding a proton transfer-like transition state(PCET(PT)).This difference is caused by the strongπ-πinteractions between the tetra-anionic TAML ring and the phenyl ring of the aromatic substrates,which has a“pull”effect to make the electron transfer from substrates to the Fe=O moiety inefficient. 展开更多
关键词 c-h bond activation Hydrogen atom transfer Proton coupled electron transfer Density functional theory
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Oxidative co-dehydrogenation of ethane and propane over h-BN as an effective means for C-H bond activation and mechanistic investigations 被引量:4
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作者 Hao Tian Bingjun Xu 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 2022年第8期2173-2182,共10页
Hexagonal boron nitride(h-BN)is a highly selective catalyst for oxidative dehydrogenation of light alkanes to produce the corresponding alkenes.Despite intense recent research effort,many aspects of the reaction mecha... Hexagonal boron nitride(h-BN)is a highly selective catalyst for oxidative dehydrogenation of light alkanes to produce the corresponding alkenes.Despite intense recent research effort,many aspects of the reaction mechanism,such as the observed supra-linear reaction order of alkanes,remain unresolved.In this work,we show that the introduction of a low concentration of propane in the feed of ethane oxidative dehydrogenation is able to enhance the C_(2)H_(6) conversion by 47%,indicating a shared reaction intermediate in the activation of ethane and propane.The higher activity of propane makes it the dominant radical generator in the oxidative co-dehydrogenation of ethane and propane(ODEP).This unique feature of the ODEP renders propane an effective probe molecule to deconvolute the two roles of alkanes in the dehydrogenation chemistry,i.e.,radical generator and substrate.Kinetic studies indicate that both the radical generation and the dehydrogenation pathways exhibit a first order kinetics toward the alkane partial pressure,leading to the observed second order kinetics of the overall oxidative dehydrogenation rate.With the steady-state approximation,a radical chain reaction mechanism capable of rationalizing observed reaction behaviors is proposed based on these insights.This work demonstrates the potential of ODEP as a strategy of both activating light alkanes in oxidative dehydrogenation on BN and mechanistic investigations. 展开更多
关键词 Hexagonal boron nitride Oxidative dehydrogenation Radical chain reaction Reaction order c-h activation
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Palladium-Catalyzed Formal [4+2] Cycloaddition of Benzoic and Acrylic Acids with 1,3-Dienes via C-H Bond Activation: Efficient Access to 3,4-Dihydroisocoumarin and 5,6-Dihydrocoumalins 被引量:3
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作者 Youwen Sun Guozhu Zhang 《Chinese Journal of Chemistry》 SCIE CAS CSCD 2018年第8期708-711,共4页
We report a palladium-catalyzed formal intermolecular [4+2] cycloaddition of benzoic and acrylic acids with 1,3-dienes including the stock chemicals 1,3-butadiene and isoprene leading to synthetically useful 3,4-dihy... We report a palladium-catalyzed formal intermolecular [4+2] cycloaddition of benzoic and acrylic acids with 1,3-dienes including the stock chemicals 1,3-butadiene and isoprene leading to synthetically useful 3,4-dihydroisocoumarins and 5,6-dihydrocoumalins. Stepwise C-H bond cleavage and annulation are likely involved in the reaction pathway. The synthetic potential of the methodology was demonstrated by two short derivatizations and total synthesis of natural product Clausamine B. 展开更多
关键词 palladium(ll) c-h bond activation 1 3-diene CYCLOADDITION natural product
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Direct C-H Bond Activation of Benzoxazole and Benzothiazole with Aryl Bromides Catalyzed by Palladium(Ⅱ)-N-heterocyclic Carbene Complexes 被引量:1
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作者 Murat Kaloglu Nazan Kaloglur ismail Ozdemir 《Chinese Journal of Chemistry》 SCIE CAS CSCD 2018年第9期837-844,共8页
Herein, we report that a series of novel palladium(II)-NHC complexes (NHC=N-heterocyclic carbene) were synthesized. The structures of all novel complexes were characterized by ^1H NMR, ^13C NMR, FT-IR spectroscopy... Herein, we report that a series of novel palladium(II)-NHC complexes (NHC=N-heterocyclic carbene) were synthesized. The structures of all novel complexes were characterized by ^1H NMR, ^13C NMR, FT-IR spectroscopy and elemental analysis techniques. These palladium(ll)-NHC complexes were tested as efficient catalysts in the direct C-H bond activation of benzoxazole and benzothiazole with aryl bromides in the presence of 1 mol% catalyst loading at 150 ℃ for 4 h. Under the given conditions, various aryl bromides were successfully applied as the arylating reagents to achieve the 2-arylbenzoxazoles and 2-arylbenzothiazoles in acceptable to high yields. 展开更多
关键词 benzimidazolium bromide benzoazoles direct c-h bond activation N-heterocyclic carbene PALLADIUM
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Recent advances in the diversification of chromones and flavones by direct C-H bond activation or functionalization 被引量:4
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作者 Shanghui Tian Tian Luo +1 位作者 Yanping Zhu Jie-Ping Wan 《Chinese Chemical Letters》 SCIE CAS CSCD 2020年第12期3073-3082,共10页
Chromone and flavone are both central backbones of natural products and clinical medicines.Synthesis of diversely functionalized chromones and flavones constitutes significant research contents of the modern synthetic... Chromone and flavone are both central backbones of natural products and clinical medicines.Synthesis of diversely functionalized chromones and flavones constitutes significant research contents of the modern synthetic science because abundant molecular libraries of such types are crucial in providing candidate compounds for the discovery of new pharmaceuticals and functional materials.The direct C—H bond activation or functionalization on these heterocyclic backbones provides highly powerful tools for the rapid accesses to densely functionalized chromone and flavone derivatives.Considering the importance of the functionalized chromone and flavone compounds as well as the notable advances in the synthesis of such products by direct C—H activation or functionalization,we review herein the research advances in the C—H bond activation and functionalization reactions of chro mone and flavones,in hope of showing the current states and promise of the research domain. 展开更多
关键词 CHROMONES Flavones C—H bond activation FUNCTIONALIZATION
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Palladium-catalyzed late-stage mono-aroylation of the fully substituted pyrazoles via aromatic C-H bond activation 被引量:1
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作者 Miao-Miao Chen Ling-Yan Shao +3 位作者 Li-Jun Lun Yu-Liang Wu Xiao-Pan Fu Ya-Fei Ji 《Chinese Chemical Letters》 SCIE CAS CSCD 2019年第3期702-706,共5页
The palladium-catalyzed late-stage aroylation of 4-methyl-1,5-diaryl-lH-pyrazole-3-carboxylates has been developed via direct and exclusive mono-Csp^2-H bond activation with broad substrate scope and good functional g... The palladium-catalyzed late-stage aroylation of 4-methyl-1,5-diaryl-lH-pyrazole-3-carboxylates has been developed via direct and exclusive mono-Csp^2-H bond activation with broad substrate scope and good functional group tolerance. A dual-core dimeric palladacycle is confirmed by X-ray single crystal crystallography, and probably serves as an active species in the catalytic cycle. 展开更多
关键词 Palladium-catalysis Late-stage FUNCTIONALIZATION AroYlation Fully SUBSTITUTED PYRAZOLES c-h bond activation Cyclopalladated intermediate
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Photocatalytic C-H Bonds Activation:Ambient Carbonylation of Cyclohexane by Co(acac)_2 Under Ultraviolet Irradiation
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作者 Da Bin GAo Jing Mei YIN +1 位作者 Ming GUO Yuan YU(Departemnt of Chemistry & Chemical Engineering, Dalian University, Dalian 116622)Yong An MA(National Marine Environmental Monitoring Center, Institute of Marine Environmental Protection, State Oceanic Administrat 《Chinese Chemical Letters》 SCIE CAS CSCD 1997年第9期763-764,共2页
A high turnover number was achieved in the photocatalytic carbonylation of C - H bonds of cyclohexane catalyzed by Co (acac)2 under ambient conditions (1 atm,25℃) to give mainly cyclohexanecarboxaldehyde.
关键词 acac Photocatalytic c-h bonds activation Under Ultraviolet Irradiation
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Catalytic Benzylation Reactions: From C-H Bond Activation to C-N Bond Activation
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作者 Tianxiao Jiang Hongchi Liu +1 位作者 Haocheng Zhang Hanmin Huang 《Chinese Journal of Chemistry》 SCIE CAS CSCD 2021年第5期1070-1078,共9页
Transition-metal mediated activation of inert chemical bonds is an ongoing topic in homogeneous catalysis.In view of the abundance and accessibility of alkylarenes and benzylamines,the use of them as benzyl source in ... Transition-metal mediated activation of inert chemical bonds is an ongoing topic in homogeneous catalysis.In view of the abundance and accessibility of alkylarenes and benzylamines,the use of them as benzyl source in catalytic benzylation reactions via benzylic C-H and C-N bond activation is highly desirable.Indeed,compared with the traditional approaches with benzyl halide as the substrates,benzylation reactions via C-H and C-N bond cleavage provide more efficient,atom-economic strategies to access myriads of synthetically important molecules.In this account,our group's efforts on catalytic benzylation reactions via directed C-H activation,nondirected C-H activation and C-N bond activation are summarized. 展开更多
关键词 BENZYLATION c-h activation C-N activation RADICALS CATALYSIS
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Synthesizing active and durable cubic ceria catalysts(<6 nm)for fast dehydrogenation of bio-polyols to carboxylic acids coproducing green H_(2)
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作者 Mengyuan Liu Puhua Sun +3 位作者 Guangyu Zhang Xin Jin Chaohe Yang Honghong Shan 《Green Energy & Environment》 SCIE EI CAS CSCD 2024年第3期529-543,共15页
Dehydrogenation is considered as one of the most important industrial applications for renewable energy.Cubic ceria-based catalysts are known to display promising dehydrogenation performances in this area.Large partic... Dehydrogenation is considered as one of the most important industrial applications for renewable energy.Cubic ceria-based catalysts are known to display promising dehydrogenation performances in this area.Large particle size(>20 nm)and less surface defects,however,hinder further application of ceria materials.Herein,an alternative strategy involving lactic acid(LA)assisted hydrothermal method was developed to synthesize active,selective and durable cubic ceria of<6 nm for dehydrogenation reactions.Detailed studies of growth mechanism revealed that,the carboxyl and hydroxyl groups in LA molecule synergistically manipulate the morphological evolution of ceria precursors.Carboxyl groups determine the cubic shape and particle size,while hydroxyl groups promote compositional transformation of ceria precursors into CeO_(2) phases.Moreover,enhanced oxygen vacancies(Vo)on the surface of CeO_(2) were obtained owing to continuous removal of O species under reductive atmosphere.Cubic CeO_(2) catalysts synthesized by the LA-assisted method,immobilized with bimetallic PtCo clusters,exhibit a record high activity(TOF:29,241 h^(-1))and Vo-dependent synergism for dehydrogenation of bio-derived polyols at 200℃.We also found that quenching Vo defects at air atmosphere causes activity loss of PtCo/CeO_(2) catalysts.To regenerate Vo defects,a simple strategy was developed by irradiating deactivated catalysts using hernia lamp.The outcome of this work will provide new insights into manufacturing durable catalyst materials for aqueous phase dehydrogenation applications. 展开更多
关键词 Cubic ceria Oxygen vacancy DEHYDROGENATION c-h bond activation
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Competition between C-C and C-H Activation in Reactions of Neutral Nickel Atom with Cycloalkanes (n = 3-7)
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作者 杨静 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2014年第1期122-134,共13页
A theoretical investigation of the reaction mechanisms for C-H and C-C bond activation processes in the reaction of Ni with cycloalkanes C,,H2. (n = 3-7) is carried out. For the Ni + CnH2, (n = 3, 4) reactions, t... A theoretical investigation of the reaction mechanisms for C-H and C-C bond activation processes in the reaction of Ni with cycloalkanes C,,H2. (n = 3-7) is carried out. For the Ni + CnH2, (n = 3, 4) reactions, the major and minor reaction channels involve C-C and C-H bond activations, respectively, whereas Ni atom prefers the attacking of C-H bond over the C-C bond in CnH2n (n = 5=7). The results are in good agreement with the experimental study. In all cases, intermediates and transition states along the reaction paths of interest are characterized, It is found that both the C-H and C-C bond activation processes are proposed to proceed in a one-step manner via one transition state. The overall C-H and C-C bond activation processes are exothermic and involve low energy barriers, thus transition metal atom Ni is a good mediator for the activity of cycloalkanes CnH2n (n = 3 -7). 展开更多
关键词 reaction mechanism c-h bond activation C-C bond activation cycioalkanes nickel atom
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Site-specific deposition creates electron-rich Pd atoms for unprecedented C-H activation in aerobic alcohol oxidation 被引量:2
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作者 Yang Yan Bin Ye +8 位作者 Mingshu Chen Linfang Lu Jian Yu Yuheng Zhou Yong Wang Juanjuan Liu Liping Xiao Shihui Zou Jie Fan 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2020年第8期1240-1247,共8页
Here,we demonstrate a photochemical strategy to site-specifically deposit Pd atoms on Au nanoparticles.The high-sensitivity low-energy ion scattering spectra combined with the X-ray photoelectron spectra reveal that t... Here,we demonstrate a photochemical strategy to site-specifically deposit Pd atoms on Au nanoparticles.The high-sensitivity low-energy ion scattering spectra combined with the X-ray photoelectron spectra reveal that the surface electronic structure of Pd can be continuously regulated by tailoring the Pd-to-Au molar ratio and the location of Pd atoms in Au Pd nanoparticles.It is revealed that electron-rich Pd atoms are considerably more active than the net Pd atoms in aerobic alcohol oxidation.Remarkably,the catalyst with the most electron-rich Pd sites(binding energy downshift:1.0 e V)exhibits an extremely high turnover frequency(~500000 h-1 vs 12000 h-1 for that with net Pd atoms)for solvent-free selective oxidation of benzyl alcohol,which is,to the best of our knowledge,the highest value ever reported.Kinetic studies reveal that electron-rich Pd atoms can accelerate the oxidation of benzyl alcohol by facilitating C-H cleavage,as indicated by the significant reduction in the activation energy as compared to net Pd atoms. 展开更多
关键词 AuPd/TiO2 Benzyl alcohol Selective oxidation c-h activation Electronic structure
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Light-driven activation of carbon-halogen bonds by readily available amines for photocatalytic hydrodehalogenation 被引量:1
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作者 Di Meng Qian Zhu +5 位作者 Yan Wei Shengli Zhen Ran Duana Chuncheng Chen Wenjing Song Jincai Zhao 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2020年第10期1474-1479,共6页
A straightforward protocol using readily available aromatic amines,N,N,N',N'-tetramethyl-p-phenylenediamine or N,N,N',N'-tetramethylbenzidine,as photocatalysts was developed for theefficient hydrodehal... A straightforward protocol using readily available aromatic amines,N,N,N',N'-tetramethyl-p-phenylenediamine or N,N,N',N'-tetramethylbenzidine,as photocatalysts was developed for theefficient hydrodehalogenation of organic halides,such as 4'-bromoacetophenone,polyfluoroarenes,cholorobenzene,and 2,2',4,4'-tetrabromodiphenyl ether(a resistant and persistent organic pollu-tant).The strongly reducing singlet excited states of the amines enabled diffusion-controlled disso-ciative electron transfer to effectively cleave carbon-halogen bonds,followed by radical hydrogena-tion.Diisopropylethylamine served as the terminal electron/proton donor and regenerated theamine sensitizers. 展开更多
关键词 Carbon-halogen bond activation Photocatalysis Halogenated organic pollutants Reductive dehalogenation Environmental remediation
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分子筛限域单位点钴体系催化芳香族化合物C-H键自调节高效氧化
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作者 党健 李玮杰 +3 位作者 秦斌 柴玉超 武光军 李兰冬 《Chinese Journal of Catalysis》 SCIE CAS CSCD 2024年第2期133-142,共10页
通过芳香族化合物的碳-氢键活化与选择氧化,可以将廉价芳香烃类原料转化为高附加值含氧产品,因此,该反应在基础研究和工业生产中均受到广泛关注.传统的苯乙酮生产工艺存在毒性底物使用、催化剂回收困难、反应条件苛刻以及产物收率低等问... 通过芳香族化合物的碳-氢键活化与选择氧化,可以将廉价芳香烃类原料转化为高附加值含氧产品,因此,该反应在基础研究和工业生产中均受到广泛关注.传统的苯乙酮生产工艺存在毒性底物使用、催化剂回收困难、反应条件苛刻以及产物收率低等问题.通过大量的研究探索,科研人员进一步改进其生产工艺,利用环烷酸钴作为均相催化剂,实现了无溶剂条件下分子氧直接选择氧化乙苯生成苯乙酮.相比均相催化,多相催化在催化剂回收和产物分离方面具有优势,更适合工业化生产.因此,开发用于乙苯选择氧化制苯乙酮的高效稳定多相催化体系非常重要,但具有较大挑战.本文采用原位配体保护的水热合成法将钴配合物(钴-二乙烯三胺)封装在Y型分子筛中,并经进一步焙烧去除配体成功制得Co@Y分子筛催化剂.在无溶剂、无添加剂的条件下,单位点Co作为Co@Y分子筛催化剂的活性位点可催化乙苯选择氧化生成苯乙酮.X射线粉末衍射、透射电镜、紫外可见光吸收光谱和固体核磁共振谱等结果表明,该单位点Co(Co^(2+))通过与骨架氧原子作用稳定限域在Y型分子筛中.为明确Co@Y分子筛催化剂中单位点Co在乙苯氧化反应中所起的重要作用,本文还对比了不同后合成方法所制备的Y分子筛(Co/Y,Co-Y)催化剂及工业环烷酸钴催化剂的催化性能.结果表明,在相同反应条件下,Co@Y分子筛催化剂表现出最高的催化性能,也说明在乙苯氧化反应过程中Co@Y分子筛催化剂的单位点Co有别于上述其他催化剂的活性位点.此外,在Co@Y催化剂热过滤实验中未检测出Co物种浸出,表明Co@Y分子筛催化乙苯氧化反应为多相催化过程,并且在多次循环测试后,Co@Y催化剂结构和反应活性均未发生明显变化.这两项实验均表明Co@Y催化剂具有高稳定性.值得注意的是,在乙苯氧化反应过程中观察到自加速现象,为此进行了对比实验(添加苯甲醛或1-苯乙醇的对比实验)和反应动力学分析.结果表明,痕量苯甲醛或1-苯乙醇的加入会显著改变Co@Y催化剂在乙苯氧化反应中的催化行为,痕量苯甲醛的加入可将反应表观活化能从69.7降至53.7 kJ/mol.本文也通过第一性原理密度泛函理论(DFT)计算系统研究了Co@Y分子筛催化剂单位点Co处乙苯选择氧化反应机理及反应过程中自加速现象产生的原因.DFT计算结果结合上述对比实验和反应动力学分析结果表明,加入痕量苯甲醛或者1-苯乙醇后部分乙苯会直接氧化生成苯乙酮,而非通过乙苯→1-苯乙醇→苯乙酮的途径生成苯乙酮.DFT计算结果也阐明反应过程中自加速现象的产生源于单位点Co处活性氧物种(O^(*))的生成.该活性氧物种在乙苯、苯甲醛和1-苯乙醇的氧化途径中均能自发生成,并且该物种类似“引发剂”促使后续更多链式反应的发生,在乙苯氧化反应过程中具有非常重要的作用.综上所述,本文为理解芳香族化合物碳-氢键选择氧化实验现象与催化作用机制提供了有益见解,可为理性设计开发更高效的催化剂提供新思路. 展开更多
关键词 碳-氢键活化 多相催化 Co@Y分子筛催化剂 自加速 活性氧物种
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Density Functional Studies of the Reaction of Ytterbium Monocation with Fluoromethane:C-F Bond Activation and Electron-Transfer Reactivity
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作者 Dong Ju ZHANG Cheng Bu LIU 《Chinese Chemical Letters》 SCIE CAS CSCD 2002年第4期359-362,共4页
The potential energy surface and reaction mechanism corresponding to the reaction of ytterbium monocation with fluoromethane, which represents a prototype of the activation of C-F bond in fluorohydrocarbons by bare la... The potential energy surface and reaction mechanism corresponding to the reaction of ytterbium monocation with fluoromethane, which represents a prototype of the activation of C-F bond in fluorohydrocarbons by bare lanthanide cations, have been investigated for the first time by using density functional theory. A direct fluorine abstraction mechanism was revealed, and the related thermochemistry data were determined. The electron-transfer reactivity of the reaction was analyzed using the two-state model, and a strongly avoided crossing behavior on the transition state region was shown. The present results support the reaction mechanism inferred from early experimental data and the related thermochemistry data can provide a guide for further experimental researches. 展开更多
关键词 C-F bond activation electron transfer ytterbium monocation fluoromethane DFT
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Catalytic C-H activation-initiated transdiannulation:An oxygen transfer route to ring-fluorinated tricyclic γ-lactones
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作者 Qiuyun Li Yannan Zhu +4 位作者 Yining Wang Gang Qi Wen-Juan Hao Kelu Yan Bo Jiang 《Chinese Chemical Letters》 SCIE CAS CSCD 2024年第9期145-149,共5页
Catalytic C–H activation-initiated annulation reactions have emerged as a versatile strategy for the efficient construction of diverse ring structural units and complex cyclic molecules in synthetic chemistry.Herein,... Catalytic C–H activation-initiated annulation reactions have emerged as a versatile strategy for the efficient construction of diverse ring structural units and complex cyclic molecules in synthetic chemistry.Herein,we describe a new Rh(Ⅲ)-catalyzed C–H activation-initiated transdiannulation reaction of N,Ndimethyl enaminones with gem-difluorocyclopropenes in the presence of H_(2)O,enabling a facile and oxygen transfer access to ring-fluorinated tricyclicγ-lactones with a 6-5 ring-junction tetrasubstituted stereocenter.This approach features bond-forming/annulation efficiency,good functional group tolerance and complete regioselectivity,which may include a complex process consisting of Rh(Ⅲ)-catalyzed C(sp2)–H activation,cyclic alkene insertion,defluorinated ring-opening of gem-difluorocyclopropane,intramolecular oxygen transfer,intramolecular cyclization and oxidative hydration. 展开更多
关键词 c-h bond activation ENAMINONES Transannulation Oxygen transfer Regioselectivity
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C-H…O Hydrogen Bonds and π…π Interaction and the Crystal and Molecular Structures of 3-Nitro-benzylideneaniline-methyl-2’ 被引量:1
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作者 胡志辉 黄忠林 张德纯 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 北大核心 2004年第4期376-380,共5页
The title compound (C14H12N2O2, Mr = 240.26) crystallizes in the monoclinic system, space group P21/a with a = 7.394(1), b = 21.334(3), c = 7.423(1) ? b = 89.82(1)? V = 1170.8(3) ?, Z = 4, Dc = 1.363 g/cm3, m(MoKa) = ... The title compound (C14H12N2O2, Mr = 240.26) crystallizes in the monoclinic system, space group P21/a with a = 7.394(1), b = 21.334(3), c = 7.423(1) ? b = 89.82(1)? V = 1170.8(3) ?, Z = 4, Dc = 1.363 g/cm3, m(MoKa) = 0.93 cm-1 and F(000) = 504.00. The final R and wR are 0.0440 and 0.1370 for 2153 observed reflections (I > 2s(I)), respectively. The dihedral angle between the two phenyl rings is 52.9 and that between the NO2 group and its attached ring is 3.0. In the crystal, molecules are stacked along [100] through p…p interactions. The CH…O hydrogen bond (3.403 ? 120.4? laterally connects the stacks along [010] to form networks (001) which are further anti- parallelly connected by CH…O (3.382 ? 142.9) and p…p interactions extending along [001]. Also presented here is a brief study on the CH…O hydrogen bonds in nitro-substituted benzyl-ideneanilines which can be classified into five types, namely, )5(12R, )4(21R, )8(22R, )6(12R and )7(22R, with the first three occurring more often. 展开更多
关键词 nitro-benzylideneaniline-methyl-2’ Schiff base c-h…O hydrogen bonds π…π interaction molecular structure crystal structure
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An Extended Cu(Ⅱ) Complex Structure Sustained by Hydrogen Bonding and C-H…π Interactions 被引量:1
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作者 吴刚 王小锋 +2 位作者 愈力 张婷 张敏 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2010年第9期1337-1342,共6页
The title complex [Cu(L1)(L2)(H2O)]·H2O(1,HL1 = N-(imino(pyridin-2-yl)me-thyl)picolinamidine),HL2 = salicylic acid) has been obtained by volatilization method with L1 prepared from 2,4,6-tripyridyl-1... The title complex [Cu(L1)(L2)(H2O)]·H2O(1,HL1 = N-(imino(pyridin-2-yl)me-thyl)picolinamidine),HL2 = salicylic acid) has been obtained by volatilization method with L1 prepared from 2,4,6-tripyridyl-1,3,5-triazine in situ.1 was fully characterized by single-crystal X-ray diffraction,elemental analysis and FT-IR.This complex exhibits a three-dimensional frame-work constructed through hydrogen bonding and C-H···π stacking interactions.The cyclic voltametric behavior of complex 1 was also investigated.1 belongs to the monoclinic system,space group P21/c with a = 15.112(5),b = 7.115(2),c = 19.899(6) ,β = 112.32°,V = 1979.4(11) 3,Mr = 460.94,Dc = 1.540 g/cm3,F(000) = 948,μ = 1.146 mm-1,Z = 4,the final R = 0.0612 and wR = 0.1813 for 2510 observed reflections with I 2σ(I). 展开更多
关键词 hydrogen bond c-h···π interaction cyclic voltammetry
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The Effect of Elevated Temperature on Bond Performance of Alkali-activated GGBFS Paste 被引量:2
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作者 郑文忠 朱晶 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2013年第4期721-725,共5页
The main reaction products were investigated by analysis of microstructure of alkali-activated ground granulated blast furnace slag (GGBFS) paste. An experimental research was performed on bond performance of alkali... The main reaction products were investigated by analysis of microstructure of alkali-activated ground granulated blast furnace slag (GGBFS) paste. An experimental research was performed on bond performance of alkali-activated GGBFS paste as a construction adhesive after exposure to 20-500℃. Through XRD analysis, a few calcium silicate hydrate, hydrotalcite and tetracalcium aluminate hydrate were determined as end products, and they were filled and packed each other at room temperature. In addition, akermanite dramatically increased at 800 ~C and above. The two key parameters, the ultimate load Pu.T and effective bond length Le, were determined using test data of carbon fiber-reinforced polymer (CFRP)-to-concrete bonded joints at elevated temperature. The experimental results indicate that the ultimate load Pu.T remains relatively stable initially and then decreases with increasing temperature. The effective bond length Le increases with increasing temperature except at 300℃. The proposed temperature-dependent effective bond length formula is shown to closely represent the test data. 展开更多
关键词 alkali-activated GGBFS paste MICROSTRUCTURE bond effective bond length elevatedtemperature
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Biphasical Force-Dependent CD40 L Ligation-Induced Activation of Integrin α5β1 under Flows
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作者 Xiaoyan Jiang Jingjing Feng +1 位作者 Ying Fang Jianhua Wu 《医用生物力学》 EI CAS CSCD 北大核心 2019年第A01期158-158,共1页
As a key regulator of immune response,CD40 L is usually associated with chronic disease-related inflammation,autoimmune diseases and malignant diseases.Receptor recognition of platelet CD40 L is the initial event that... As a key regulator of immune response,CD40 L is usually associated with chronic disease-related inflammation,autoimmune diseases and malignant diseases.Receptor recognition of platelet CD40 L is the initial event that mediates platelet aggregation and leukocyte immune response.Unlike soluble CD40 L,the interaction between transmembrane platelet CD40 L and its receptors occurs within the cell junction surface,usually,in a physiological and pathological high blood flow shear stress environment.This two-dimensional reaction kinetics should be a mechano-chemical coupling process.In addition to its classical receptor CD40,CD40 L also binds to receptorα5β1,CD40 L can bind to the resting state of integrinα5β1,but the mechanical regulation mechanism of integrinα5β1 activation under fluid shear stress remains unclear.We assume that the force can promote CD40 L-inducedα5β1 activation.To check this hypothesis,we performed flow chamber experiment to investigate interaction of CD40 L andα5β1.In experiments,the bottom of the flow chamber is functionalized by a suitable concentration of CD40 L,and the fiber spheres of 6μm diameter was coated withα5β1.The selection of CD40 L concentration was based on the observation that as many tether events ofα5β1-coated spheres as possible were observed rather than stable adhesion events of these spheres.Theα5β1-coated sphere suspension was poured over the CD40 L-coated substrates in the flow chamber under different shear rates.A high-speed camera was used to observe and record tether events of fiber spheres at a rate of 100 frames per second.According to our affinity state transition model for integrin,the data were analyzed to obtain the rate of integrin activation and its mechanical regulation characteristics.Our results demonstrated that the interaction betweenα5β1 and CD40 L is biphasic force-dependent,showing mechano-chemical regulation mechanism of'Catch-slip bond'transition.The affinity jumping model was well fitted with the data obtained from flow chamber experiment at various wall shear stresses.We found that,CD40 L ligation-induced jumping ofα5β1 affinity state from low to medium(or high)one will occur within 0.5-1.0 second,resulting in prolonging of bond lifetimes.And,frequency distribution of the tether events number with tether lifetime under each force,exhibits obvious doublet peaks,one within 0.5-1 s and second within 1.5-2.5 s,indicating theα5β1 affinity state transform from low to high one.The probability distribution of the tether lifetime under different shear forces are not linear,and exists a turning point,which shows that the rate ofα5β1 dissociation from CD40 L is fast first,and then become slow,showing a force-induced conformation transformation of the integrinα5β1 from low affinity state to high affinity one.Our findings suggest that,the continuous force stimulation will quickly cause the affinity state change of integrinα5β1. The dissociation rate of theα5β1/CD40 L complex decreases first and then increases with wall shear stress,exhibiting a'Catch-slip bond'transformation of interaction betweenα5β1-CD40 L.This mechanical regulation mechanism exists in interaction of CD40 L not only toα5β1 at low affinity state but also to one at high affinity state.Our results should be useful in understanding the mechanical regulation mechanism of a5β1-CD40 L interaction-mediated cellular immune response and inflammatory processes. 展开更多
关键词 INTEGRIN activation α5β-CD40 L flow CHAMBER CATCH bond MECHANOCHEMICAL coupling
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