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Copper-catalyzed carbonylative Suzuki-Miyaura coupling of un-activated alkyl bromides with aryl boronates 认领 引用
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作者 Jiajun Zhang Xiao-Feng Wu 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 2025年第6期146-152,共7页
Herein,we present a copper-catalyzed carbonylative cross-coupling of unactivated alkyl bromides with aryl boronates under CO atmosphere which enabling the efficient synthesis of C(sp3)-C(sp2)ketones with extensive fun... Herein,we present a copper-catalyzed carbonylative cross-coupling of unactivated alkyl bromides with aryl boronates under CO atmosphere which enabling the efficient synthesis of C(sp3)-C(sp2)ketones with extensive functional group compatibility.This strategy represents a significant advance in copper-catalyzed carbonylation involving alkyl bromides and C(sp2)-nucleophiles.The protocol addresses key challenges commonly encountered in the coupling of C(sp3)-alkyl halides with aryl boron reagents,such as sluggish oxidative addition of alkyl halides,competing Suzuki-Miyaura cross-coupling,undesired dehalogenation and so on.Distinguished by its broad substrate scope and high functional group tolerance,this approach offers a robust and versatile platform for the streamlined synthesis of alkyl aryl ketones. 展开更多
关键词 Copper catalysis Unactivated alkyl bromides Carbonylation Suzuki-Miyaura coupling Arylborons
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Oxidative Methylation of Toluene with Methane over Basic Zeolite Catalysts Promoted with Alkali Metal Bromides and Alkali Metal Oxides 认领 引用 被引量：1
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作者 Ling Ping ZHOU Wei LI +2 位作者 Ke Yi TAO Xuan Wen LI He Xuan LI College of Chemistry and Molecular Engineering, Peking University, Beijing 100871 Department of Chemistry, Nankai University, Tianjin 300071 《Chinese Chemical Letters》 SCIE CAS 2000年第9期827-830,共4页
The catalytic effects for the oxidative methylation of toluene with methane over the basic zeolite catalysts prepared by promoting KY, KX, KM, KZSM-5 or KP with alkali-metal bromides and alkali-metal oxides have been ... The catalytic effects for the oxidative methylation of toluene with methane over the basic zeolite catalysts prepared by promoting KY, KX, KM, KZSM-5 or KP with alkali-metal bromides and alkali-metal oxides have been investigated comparatively. The alkali-metal bromides promoted substrates are more effective than the alkali-metal oxides promoted systems. Moreover, the NaBr promoted systems are more active than KBr promoted systems. The most effective catalytic system (8wt%NaBr)/KZSM-5 gave a toluene conversion as high as 76.3% and a total C-8 selectivity of 76.4% (styrene/ethylbenzene=9.76) resulting in a total C-8 yield of 58.3%. 展开更多
关键词 styrene methane oxidative methylation alkali-metal oxides alkali-metal bromides
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Determination of Standard Molar Enthalpies of Formation of Complexes of Rare Earth Bromides with Glycine 认领 引用
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作者 孙同山 王凤廉 +1 位作者 肖玉梅 黄超 《Journal of Rare Earths》 SCIE EI CAS 1998年第2期11-15,共5页
The integral heat of solution of REBr 3·3Gly·3H 2O(RE=La, Pr, Nd, Sm, Eu, Gd, Tb, Dy and Y; Gly is glycine) in water, REBr 3· n H 2O(RE=La, Ce and Pr, n =7; RE=Nd, Sm, Eu, Gd, Tb, Dy and Y, n =6) in aqu... The integral heat of solution of REBr 3·3Gly·3H 2O(RE=La, Pr, Nd, Sm, Eu, Gd, Tb, Dy and Y; Gly is glycine) in water, REBr 3· n H 2O(RE=La, Ce and Pr, n =7; RE=Nd, Sm, Eu, Gd, Tb, Dy and Y, n =6) in aqueous glycine solution and glycine in water have been measured calorimetrically at 298 15±0 15 K. By means of a thermochemical cycle suggested in this paper, the standard molar enthalpies of formation of REBr 3·3Gly·3H 2O have been obtained and their lattice energies have been calculated. 展开更多
关键词 Rare earths Bromides Glycine Enthalpy of formation Lattice energy Integral heat of solution
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Palladium-phosphinous acid complexes catalyzed Suzuki cross-coupling reaction of heteroaryl bromides with phenylboronic acid in water/alcoholic solvents 认领 引用 被引量：2
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作者 Ben Li Cuiping Wang +1 位作者 Guang Chen Zhiqiang Zhang 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2013年第6期1083-1088,共6页
Highly active, air-stable and water-soluble palladium-phosphinous acid complexes have been applied to Suzuki cross-coupling reaction of heteroaryl bromides under mild conditions in water/alcoholic solvents. Suzuki cro... Highly active, air-stable and water-soluble palladium-phosphinous acid complexes have been applied to Suzuki cross-coupling reaction of heteroaryl bromides under mild conditions in water/alcoholic solvents. Suzuki cross-coupling reaction of heteroaryl bromides with phenylboronic acid occurred efficiently using palladium phosphinous acid complexes （POPd） and phase transfer catalyst （tetrabutylammonium bromide and polyethylene glycol） in water/ethanol mixture, water/propanol mixture and neat water respectively, the corresponding yields of cross-coupling heteroaryl-aryls were satisfied. The tert-butyl substituted ligand di-tert-butylphosphino in combination with POPd was found to be more active than the same family derived catalysts dipalladium complexes POPdl and POPd2, and other two kinds of Pd-catalysts Pd（PPh3）4 and Pd2（dba）3. The mechanism of Suzuki cross-coupling reaction between heteroaryl bromides and phenylboronic acid in water was proposed with respect to the key role of phase transfer catalyst on the transmetallation step. Compared with other solid phase transfer catalysts, TBAB was tested as the ideal one. The alkalinity of base and the molar proportion between POPd and TBAB were investigated in water and alcoholic solvents. Notably, in the presence of TBAB adding alcoholic solvents into water enhanced the yields of target products. However in terms of the liquid phase transfer catalyst of PEGs, mixing water into PEGs could slightly decrease the yields with respect to the water free PEGs bulk phase, which was probably due to the homogenous liquid conditions in pure PEGs and weak interactions between PEGs and heteroaryl bromide molecules in water depending on their molecular chain lengths. 展开更多
关键词 POPd Suzuki cross-coupling reaction heteroaryl bromides phase transfer catalyst water
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The effect of cations(NH_4^+,Na^+,K^+,and Ca2+) on chemical deactivation of commercial SCR catalyst by bromides 认领 引用 被引量：9
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作者 Huazhen Chang Chuanning Shi +4 位作者 Mingguan Li Tao Zhang Chizhong Wang Lilong Jiang Xiuyun Wang 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2018年第4期710-717,共8页
Alkali and alkaline‐earth metals from fly ash have a significant deactivation effect on catalysts used for selective catalytic reduction of NOx by NH3(NH3‐SCR).Bromides are considered effective additives to improve ... Alkali and alkaline‐earth metals from fly ash have a significant deactivation effect on catalysts used for selective catalytic reduction of NOx by NH3(NH3‐SCR).Bromides are considered effective additives to improve Hg0 oxidation on SCR catalysts.In this work,the effects of different bromides(NH4Br,NaBr,KBr,and CaBr2)on a commercial V2O5‐WO3/TiO2 catalyst were studied.NOx conversion decreased significantly over the KBr‐poisoned catalyst(denoted as L‐KBr),while that over NaBr‐and CaBr2‐poisoned catalysts(denoted as L‐NaBr and L‐CaBr,respectivity)decreased to a lesser extent compared with the fresh sample.Poor N2 selectivity was observed over L‐NaBr,L‐KBr and L‐CaBr catalysts.The decrease in the ratio of chemisorbed oxygen to total surface oxygen(Oα/(Oα+Oβ+Ow)),reducibility and surface acidity might contribute to the poor activity and N2 selectivity over L‐KBr catalyst.The increased Oαratio was conducive to the enhanced reducibility of L‐CaBr.Combined with enhanced surface acidity,this might offset the negative effect of the loss of active sites by CaBr2 covering.The overoxidation of NH3 and poor N2 selectivity in NH3 oxidation should retard the SCR activity at high temperatures over L‐CaBr catalyst.The increased basicity might contribute to increased NOx adsorption on L‐KBr and L‐CaBr catalysts.A correlation between the acid‐basic and redox properties of bromide‐poisoned catalysts and their catalytic properties is established. 展开更多
关键词 Bromide Cation Catalyst deactivation SCR catalyst N2 selectivity Surface acidity
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Suzuki Reaction of Aryl Bromides Using a Phosphine-Free Magnetic Nanoparticle-Supported Palladium Catalyst 认领 引用 被引量：2
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作者 Nghia T.BUI Trung B.DANG +1 位作者 Ha V.LE Nam T.S.PHAN 《催化学报》 2011年第11期1667-1676,共10页
A palladium catalyst immobilized on superparaganetic nanoparticles was prepared with a palladium loading of 0.30 mmol/g.The catalyst was characterized using X-ray diffraction,scanning electron microscopy,transmission ... A palladium catalyst immobilized on superparaganetic nanoparticles was prepared with a palladium loading of 0.30 mmol/g.The catalyst was characterized using X-ray diffraction,scanning electron microscopy,transmission electron microscopy,vibrating sample magnetometry,thermogravimetric analysis,Fourier transform infrared,atomic absorption spectrophotometry,and nitrogen adsorption.The immobilized palladium catalyst was an efficient catalyst without added phosphine ligands for the Suzuki cross-coupling reaction of several aryl bromides with phenylboronic acid.The recovery of catalyst was simply by magnetic decantation in the presence of a magnet.The immobilized palladium catalyst can be reused many times without significant degradation in catalytic activity.No leaching of active palladium species into the reaction solution was detected. 展开更多
关键词 superparamagnetic nanoparticle Suzuki reaction palladium aryl bromide
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Convenient one-pot synthesis of functionalized(E)-2-arylvinyl bromides from(E)-4-(2-bromovinyl)phenyl acetate 认领 引用
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作者 Yu Bo Jiang Chun Xiang Kuang 《Chinese Chemical Letters》 SCIE CAS 2009年第5期545-548,共4页
A convenient one-pot synthesis of functionalized(E)-2-arylvinyl bromides was achieved by microwave-induced deacetylation and subsequent acylation using dicyclohexyl carbodiimide(DCC)and dimethylamino-pyridine(DMAP)at ... A convenient one-pot synthesis of functionalized(E)-2-arylvinyl bromides was achieved by microwave-induced deacetylation and subsequent acylation using dicyclohexyl carbodiimide(DCC)and dimethylamino-pyridine(DMAP)at room temperature from(E)-4-(2-bromovinyl)phenyl acetate. 展开更多
关键词 One-pot synthesis (E)-2-Arylvinyl bromide Acylation Deacetylation
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Integration of Halogen-Atom Transfer with Photoredox/Chromium Dual Catalysis for Carbonyl Addition ofUnactivated Alkyl Bromidest 认领 引用
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作者 Ke Gao Haigen Shen Zhaobin Wang 《Chinese Journal of Chemistry》 SCIE CAS CSCD 2026年第10期1617-1623,共7页
The development of efficient and sustainable methods for carbonyl addition reactions remains a central focus in organic synthesis.The Nozaki—Hiyama-Kishi(NHK)reaction provides a compelling alternative to classical nu... The development of efficient and sustainable methods for carbonyl addition reactions remains a central focus in organic synthesis.The Nozaki—Hiyama-Kishi(NHK)reaction provides a compelling alternative to classical nucleophilic carbonyl additions with preformed organometallic reagents,and significant advancements have been made over the past decades. 展开更多
关键词 Photoredox/chromium dual catalysis Halogen-atom transfer Unactivated alky bromides Nozaki—Hiyama—Kishi reaction Radical-polar crossover Carbonyl addition Alcohols Late-stage functionalization
Porous polyadamantane constructed by C(sp3)-C(sp3) coupling of tertiary alkyl bromides 认领 引用
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作者 Li Jiang Zihao Wang +3 位作者 Yunji Xie Jiangtao Jia Dongtao Liu Guangshan Zhu 《Science China Chemistry》 SCIE EI CAS CSCD 2026年第5期2487-2491,共5页
Porous organic polymers(POPs)based on carbon-carbon couplings have attracted a great deal of attention owing to their excellent stability and versatile applications.To date,these POPs are mainly based on building bloc... Porous organic polymers(POPs)based on carbon-carbon couplings have attracted a great deal of attention owing to their excellent stability and versatile applications.To date,these POPs are mainly based on building blocks containing phenyl and synthesized by homo-/cross-couplings of C(sp2)or C(sp),while the POPs entirely constructed by alkane through C(sp3)C(sp3)homo-coupling are still challenging and has not been reported.Herein,we developed the first alkanebased POPs,porous polyadamantane(PPA),prepared by a novelC(sp3)C(sp3)homo-couplingstrategy of 1,3,5,7-tetrabromoadamantane.The afforded PPA showed a high surface area of 681 m2 g-1 and inherent microporosity.Moreover,as a novel organic molecular sieve,PPA exhibits efficient separation of C1-C3 alkanes owing to its aliphatic porous environment.This work opened an avenue for the construction of porous polyalkane materials. 展开更多
关键词 porous polyadamantane C(sp3)-C(sp3) coupling solvent-free reaction tertiary alkyl bromides gas separation
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Asymmetric Catalytic Dual-Site Functionalization of Allyl Bromides:Construction of Diverse Heterocyclic Frameworks 认领 引用
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作者 Pengcheng Shao Hang Cheng Yang Wang 《Chinese Journal of Chemistry》 SCIE CAS CSCD 2026年第1期111-118,共8页
Despite the widespread use of allyl bromides in organic synthesis,the asymmetric transformation of allyl bromides has been less developed.To date,the asymmetric transformation of allyl bromides has been limited to sin... Despite the widespread use of allyl bromides in organic synthesis,the asymmetric transformation of allyl bromides has been less developed.To date,the asymmetric transformation of allyl bromides has been limited to single-site functionalization,and the development of dual-site asymmetric functionalization remains unexplored.In this work,the unprecedented asymmetric dual-site functionalization of allyl bromides has been realized through an efficient organocatalytic system,overcoming the persistent limitation of single-site transformations.Employing dinucleophiles including 3-aminobenzofurans,2-aminoindoles,and cyclohexane-1,3-diones,this methodology affords benzofuro[3,2-b]pyridines andα-carbolines in good yields with excellent stereoselectivity.The transformation proceeds via a chemoselective SN2′pathway mediated by a chiral pyrrolidinyl sulfonamide catalyst,which generates ammonium salts in situ to achieve stereocontrol.The protocol was successfully extended to enantioenriched privileged pyran frameworks,and was applied to diverse downstream transformations.Gram-scale synthesis maintained high enantioselectivity,confirming practical utility.This approach effectively addresses key challenges in efficient construction of complex fused-ring heterocycles,substantially expanding the synthetic applications of allyl bromides. 展开更多
关键词 Cyclic allyl bromide Benzofuro[3,2-b]pyridine α-Carboline Pyran Dinucleophile Asymmetric catalysis Organocatalysis Diastereoselectivity Enantioselectivity
Conversion of Alcohols to Bromides by Trimethylsilane and lithium Bromide in Acetone 认领 引用
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作者 Wei Feng Zhang Xiao-xia Zhang Qing Wang Ji-yu Chen Dai-mo 《合成化学》 CAS 2004年第Z1期37-37,共1页
关键词 bromination, acetone, methylation, trimethylsilane, lithium bromide.
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Reversible tri-state structural transitions of hybrid copper(I)bromides toward tunable multiple emissions 认领 引用 被引量：7
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作者 Jiajing Wu Jing-Li Qi +3 位作者 Yue Guo Shufang Yan Wenlong Liu Sheng-Ping Guo 《Inorganic Chemistry Frontiers》 SCIE EI 2024年第1期156-163,共8页
Hybrid copper halides have been rapidly developed because of their high photoluminescence quantum yield(PLQY),good water resistance,and variable structures;nevertheless,the controlled synthesis and interconversion of ... Hybrid copper halides have been rapidly developed because of their high photoluminescence quantum yield(PLQY),good water resistance,and variable structures;nevertheless,the controlled synthesis and interconversion of multiple hybrid copper halides containing different coordination geometries are rarely reported. 展开更多
关键词 reversible tri state structural transitions hybrid copper halides interconversion hybrid copper i bromides water resistance tunable multiple emissions photoluminescence quantum yield coordination geometries
Palladium-Catalyzed Desulfitative Cross-Coupling of Sodium Arylsulfinates with Aryl Bromides and Chlorides:An Alternative Convenient Synthesis of Biaryls 认领 引用 被引量：2
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作者 Chao Zhou Yarning Li +4 位作者 Yang Lu Rong Zhang Kun Jin Xinmei Fu Chunying Duan 《Chinese Journal of Chemistry》 SCIE CAS CSCD 2013年第10期1269-1273,共5页
An alternative method for synthesis of biaryls has been developed through the Pd catalyzed desulfitative coupling reaction of sodium arylsulfinates with aryl bromides and chlorides.The procedure tolerates a variety of... An alternative method for synthesis of biaryls has been developed through the Pd catalyzed desulfitative coupling reaction of sodium arylsulfinates with aryl bromides and chlorides.The procedure tolerates a variety of functional groups,such as cyano,formyl,acetyl,chloro,methoxy,trifluoromethyl and heteroaromatic unit.The desired products were obtained in moderate to excellent yields under relatively mild reaction conditions without additives,base or co-catalyst. 展开更多
关键词 cross-coupling desulfination aryl bromides aryl chlorides palladium
Lead-promoted Barbier-type reaction of aldehydes with propargyl bromides in aqueous media 认领 引用 被引量：2
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作者 Zhou, JY Sun, GF +2 位作者 Zhang, MF Jia, Y Wu, SH 《Chinese Journal of Chemistry》 SCIE EI CAS 1997年第4期361-365,共5页
This paper reports that the reaction of the propargyl bromides with aldehydes promoted by powdered lead in aqueous media. The selectivity and possible mechanism of these reactions are discussed. The yields of products... This paper reports that the reaction of the propargyl bromides with aldehydes promoted by powdered lead in aqueous media. The selectivity and possible mechanism of these reactions are discussed. The yields of products for reaction of propargyl bromide are 31 similar to 71%. The ratios of allenyl alcohol and homopropargyl alcohol are 1:1.5 to 1:3. The product for reaction of phenyl propargyl bromide is allenyl alcohol and the yields are 52 similar to 84%. 展开更多
关键词 lead reagent Barbier-type reaction propargyl bromides aqueous media
Electrochemical Carboarylation of Activated Alkenes with CO2and Electron-deficient Aryl Bromides 认领 引用 被引量：1
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作者 Zhaoliang Yang Chunlei Liu +6 位作者 Cheng Zhong Jianye Zhang Shengzhang Liu mingming Yu yangyang Li Hong Yi Aiwen Lei 《Chinese Journal of Chemistry》 SCIE CAS CSCD 2024年第24期3367-3372,共6页
The simultaneous construction of two vicinal C—C bonds in a molecule remains a significant challenge.In this work,we disclose an electroreductive carboarylation of activated alkenes under mild,transition metal-free c... The simultaneous construction of two vicinal C—C bonds in a molecule remains a significant challenge.In this work,we disclose an electroreductive carboarylation of activated alkenes under mild,transition metal-free conditions.Utilizing readily available starting materials(electron-deficient aryl bromides,activated alkenes,and CO2),this method demonstrates broad substrate scope and good functional group tolerance.Notably,this strategy enables the addition of two distinct electrophiles across an alkene in a highly chemo-and regioselective manner. 展开更多
关键词 Electroreductive Difunctionalization Carboarylation Activated alkenes CO2 Aryl bromides
Copper-Catalyzed Cyanations of Aromatic Bromides with Benzoyl Cyanide 认领 引用 被引量：1
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作者 Liang Wang Liang Pan +1 位作者 Qun Chen Mingyang He 《Chinese Journal of Chemistry》 SCIE CAS CSCD 2014年第12期1221-1224,共4页
Aromatic nitriles were synthesized through copper-catalyzed cyanations of aromatic bromides using benzoyl cyanide as the cyanide source.A series of functional groups were tolerated under the reaction conditions to pro... Aromatic nitriles were synthesized through copper-catalyzed cyanations of aromatic bromides using benzoyl cyanide as the cyanide source.A series of functional groups were tolerated under the reaction conditions to provide the products in good yields.Moreover,this protocol avoids using of highly toxic alkali cyanides and expensive palladium catalysts. 展开更多
关键词 nitriles aromatic bromides benzoyl cyanide copper-catalysis cyanation
A micro-crosslinked amphiphilic copolymer viscosifier for high temperature and high-density inorganic salt completion fluids 认领 引用
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作者 Kai-He Lv Qiang Li +6 位作者 Li-Li Yan Yong Kong Zhang-Cheng Yang Yuan-Zhi Qu Ren Wang Jin-Sheng Sun Jian Li 《Petroleum Science》 SCIE EI CAS CSCD 2026年第3期1293-1306,共14页
Solid-free brine completion fluids,characterized by their exceptional reservoir protection capabilities and optimal rheological behavior,are highly desirable for applications in oil and gas reservoirs and have attract... Solid-free brine completion fluids,characterized by their exceptional reservoir protection capabilities and optimal rheological behavior,are highly desirable for applications in oil and gas reservoirs and have attracted significant attention in recent decades.However,as the core component of completion fluids,the viscosifier was prone to curling or even precipitating in high-temperature,high-density inorganic salt(divalent calcium)environments,leading to failure in thickening performance.In this study,a micro-crosslinked amphoteric viscosifier(i.e.,A-DDAS)resistant to high temperature and calcium ions was synthesized via free radical copolymerization of N,N-dimethylacrylamide(DMAA),diallyl dimethyl ammonium chloride solution(DMDAAC),2-acrylamido-2-methylpropane sulfonic acid(AMPS),[2-(methacryloyloxy)ethyl]dimethyl-(3-sulfopropyl)ammonium hydroxide(SBMA),and pentaerythritol triallyl ether(APE).The molecular structure and physicochemical properties of the copolymer were systematically studied by NMR,FTIR,XPS,TGA and XRD.Rheological experiments demonstrated that calcium bromide brine containing A-DDAS copolymers exhibited outstanding shear-thinning behavior and rapid thixotropic recovery,essential for efficient wellbore cleaning and fluid displacement during completion operations.As the density of calcium bromide brine increased,more calcium ions shield electrostatic attractions between the cationic and anionic moieties along the copolymer backbone,thereby promoting full extension of the polymer chains and enhancing the binding energy with water molecules.After adding 1.0 wt%A-DDAS copolymer to a 1.75 g/cm3 calcium bromide brine and aging the mixture at 180℃for 16 h,the completion fluids exhibited an apparent viscosity of 71 mPa·s,plastic viscosity of 64 mPa·s,and yield point of 7 Pa,which were significantly better than common viscosifiers(HE300 and Dristemp).Therefore,A-DDAS copolymers demonstrated exceptional thickening capacity and dynamic shear enhancement in high-temperature,high-density calcium bromide brine,notably rendering it ideally suited for deployment in completion fluids for deep and ultra-deep wells. 展开更多
关键词 Solid-free completion fluids Viscosifier High temperature and high density Calcium bromide Deep and ultra-deep wells
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Studies on sulfinatodehalogenation——ⅪⅩ.The reaction of perfluoroalkyl iodides and perfluoroalkane-sulfonyl bromides with conjugated dienes 认领 引用
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作者 HUANG Wei-Yuan ZHANG Han-Zhong 《Chinese Journal of Chemistry》 SCIE CAS 1991年第1期76-83,共8页
The reaction of TbCl_3 with K[2,4-(CH_2)_2C_5H_5] at 0℃ in THF followed by crystalliza- tion at -90℃ led to a pale yellow hexagonal prismatic crystalline product [2,4-[CH_3)_2-η~5-C_5H_5]2- Tb·1/2THF, which... The reaction of TbCl_3 with K[2,4-(CH_2)_2C_5H_5] at 0℃ in THF followed by crystalliza- tion at -90℃ led to a pale yellow hexagonal prismatic crystalline product [2,4-[CH_3)_2-η~5-C_5H_5]2- Tb·1/2THF, which is highly sensitive to air and water and rapidly efflorescent at ambient temper- ature. The single Crystal X-ray diffraction data of the compound have been collected at low tem- perature (-60℃) and the crystal structure has been solved by heavy atom method. It belongs to triclinic system, space group Pl with lattice parameters a=8.477 (?),b=12.583 (?),c=12.858 (?), a=118.08°,β=91.38°,γ=108.75°,V=1120.36 (?)~ 3 and Z=2. Least-squares refinement converged to a final value R=0.043. The compound possesses an idealized G2h symmetry、with three 2,4- dimethylpentadienyl ligands bound to the central terbium atom in a pentahapto mode (η~5). Each unit cell contains two molecules of[2,4-(CH_3)_2-η~5-C_5H_5]_3Tb and one molecule of solvent THF, of which the role in the lattice has been discussed in detail. 展开更多
关键词 Br The reaction of perfluoroalkyl iodides and perfluoroalkane-sulfonyl bromides with conjugated dienes
Nickel-Catalyzed Cross-Electrophile Coupling of Aryl Bromides with Pyrimidin-2-yl Tosylates 认领 引用 被引量：1
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作者 Chunyu Gong Congde Huo +1 位作者 Xicun Wang Zhengjun Quan 《Chinese Journal of Chemistry》 SCIE CAS CSCD 2017年第9期1366-1370,共5页
A new protocol for the NiC12-catalyzed cross-electrophile coupling of aryl bromides with pyrimidin-2-yl tosyl- ates to give the corresponding C2-arylation pyrimidine derivatives has been developed. This study provides... A new protocol for the NiC12-catalyzed cross-electrophile coupling of aryl bromides with pyrimidin-2-yl tosyl- ates to give the corresponding C2-arylation pyrimidine derivatives has been developed. This study provides an improvement over previous methods by using pyrimidin-2-yl tosylates instead of halides as coupling partners that are stable and easily available. 展开更多
关键词 pyrimidin-2-yltosylates functional pyrimidines cross-electrophile coupling aryl bromides Nickel-catalyst
Molecular orbital effect in above-threshold ionization of vinyl bromide induced by strong laser fields 认领 引用
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作者 Qi Chen Yang Liu +4 位作者 Wei Yang Di Liu Hang Lv Bing Yan Haifeng Xu 《Chinese Physics B》 SCIE EI CAS CSCD 2026年第4期101-108,共8页
Ionization is a fundamental process that may induce a variety of highly nonlinear physical phenomena in strong femtosecond laser fields.Compared to that of atoms,strong-field ionization(SFI)of polyatomic molecules is ... Ionization is a fundamental process that may induce a variety of highly nonlinear physical phenomena in strong femtosecond laser fields.Compared to that of atoms,strong-field ionization(SFI)of polyatomic molecules is far from being understood because of their diverse geometric and orbital structures.In this study,we experimentally investigate SFI of the vinyl bromide(C2H3Br)molecule in near ultraviolet and near-infrared strong laser fields employing the electron velocity map imaging(VMI)method.The distinct above-threshold ionization(ATI)structure of the molecule is clearly observed in both strong laser fields.The electron kinetic energy as well as the angular distributions is derived from the electron VMI measurements,and their dependence on the laser intensity is investigated and discussed.Analysis reveals that owing to the small energy difference between the low-lying electronic orbitals of the C2H3Br molecule,multiple orbital effect plays a pivotal role in the SFI of the molecule.The present study adds our knowledge on SFI and ATI of the C2H3Br molecule,and sheds some light on the interaction of polyatomic molecules with ultrafast strong laser fields. 展开更多
关键词 above threshold ionization strong laser field molecular orbital effect vinyl bromide
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