期刊文献+
共找到362篇文章
< 1 2 19 >
每页显示 20 50 100
A New Approach to Inducing Silicon Tethered Ring-closing Metathesis Reactions
1
作者 YANG Hong-li VAULTIER Miche 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2002年第4期414-418,共5页
Ring-closing metathesis reactions involving diallyldiphenylsilane and diallyloxydiphenylsilane were successfully performed by using only 0 01 mol or even less of Grubbs' catalyst 1. The effects of reaction parame... Ring-closing metathesis reactions involving diallyldiphenylsilane and diallyloxydiphenylsilane were successfully performed by using only 0 01 mol or even less of Grubbs' catalyst 1. The effects of reaction parameters, such as solvents, temperature and concentration of the catalyst are discussed. 展开更多
关键词 ring-closing metathesis reaction Grubbs' catalyst Diallyldiphenylsilane Diallyloxydiphenyl-silane
下载PDF
Ring-closing Metathesis on anAllyl-terminated Carbosilane Dendrimer
2
作者 ChuanJianZHOU RuiFangGUAN +2 位作者 ShengYuFENG DavidJ.BERG StephenR.STOBART 《Chinese Chemical Letters》 SCIE CAS CSCD 2005年第1期4-6,共3页
Grubbs’ catalyst was used to prepare a series of carbosilane dendrimers with silacyclopentene peripheral groups. It was found that ring closing metathesis reaction was influenced strongly by the reaction temperatur... Grubbs’ catalyst was used to prepare a series of carbosilane dendrimers with silacyclopentene peripheral groups. It was found that ring closing metathesis reaction was influenced strongly by the reaction temperature and the amount of catalyst. 展开更多
关键词 Grubb’s catalyst carbosilane dendrimers metathesis.
下载PDF
Modular Total Synthesis of (-)-Palmyrolide A and (+)-(5S,7S)-Palmyrolide A via Ring-Closing Metathesis and Alkene Isomerization 被引量:1
3
作者 Yecai Lai Wei-Min Dai 《Chinese Journal of Chemistry》 SCIE CAS CSCD 2021年第1期69-74,共6页
A pentamodule assembly approach has been established for total synthesis of the naturally occurring(-)-palmyrolide A and(+)-5,7-epi-palmyrolide A.By using the racemic tert-butyl carbinol-containing alkyl iodide,the tw... A pentamodule assembly approach has been established for total synthesis of the naturally occurring(-)-palmyrolide A and(+)-5,7-epi-palmyrolide A.By using the racemic tert-butyl carbinol-containing alkyl iodide,the two diastereoisomeric macrolides could be obtained from the same sequence of reactions,demonstrating the flexibility of the multimodule assembly strategy for diverted total synthesis. 展开更多
关键词 ALKENE B-Alky Suzuki-Miyaura cross-coupling Modular total synthesis Cross coupling ring-closing metathesis
原文传递
Halogen Bond Catalysis on Carbonyl-Olefin Ring-Closing Metathesis Reaction:Comparison with Lewis Acid Catalysis
4
作者 Ying Li Yuanyuan Sun +2 位作者 Lingpeng Meng Qingzhong Li Yanli Zeng 《Chinese Journal of Chemistry》 SCIE CAS CSCD 2022年第11期1275-1284,共10页
The carbonyl-olefin ring-closing metathesis reactions have become a powerful tool for carbon-carbon bond formation.In this work,the halogen bond catalysis and classical Lewis acid catalysis on the carbonyl-olefin ring... The carbonyl-olefin ring-closing metathesis reactions have become a powerful tool for carbon-carbon bond formation.In this work,the halogen bond catalysis and classical Lewis acid catalysis on the carbonyl-olefin ring-closing metathesis reaction were investigated by density function theory.For both the halogen bond catalysis and classical Lewis acid catalysis,the carbonyl-olefin ring-closing me-tathesis reaction occurs by[2+2]-cycloaddition process and[2+2]-cycloreversion process,the reaction energy barriers are low,there-fore,it can be performed easily at room temperature.The essential difference of the two kinds of catalysts is that the catalytic mecha-nism of halogen bond catalysis is mainly contribution of electrostatic interaction,while that of classical Lewis acid catalysis is mainly catalyzed by orbital interaction.The halogen bond donor catalysts(ICI_(3),IF_(3))are expected to be efficient catalysts for the reaction and further promote the chemical synthesis of carbonyl-olefin ring-closing metathesis reaction. 展开更多
关键词 Halogen bond donors Lewis acids Electrostatic interactions Orbital interaction Carbonyl-olefin ring-closing metathesis
原文传递
Synthesis of a novel uridine analogue and its use in attempts to form new cyclonucleosides using ring-closing metathesis
5
作者 MONDON Martine LEN Christophe 《Science China Chemistry》 SCIE EI CAS 2010年第9期1932-1936,共5页
One novel nucleoside analogue having a hex-5-enyl group and an allyl group in the 5'-C and 3-N position was synthesized regioand diastereoselectively from D-glucose in twelve steps.In order to reach a particular c... One novel nucleoside analogue having a hex-5-enyl group and an allyl group in the 5'-C and 3-N position was synthesized regioand diastereoselectively from D-glucose in twelve steps.In order to reach a particular conformation of nucleosides the nucleoside formation of restricted cyclonucleoside analogues was studied via Ring-Closing Metathesis. 展开更多
关键词 NUCLEOSIDE restrictedconformation metathesis
原文传递
1-Butene isomerization and metathesis over Mo/mordenite-alumina: Factors influencing product distribution and induction period 被引量:3
6
作者 Xiujie Li Xiangxue Zhu +5 位作者 Dazhou Zhang Fucun Chen Peng Zeng Shenglin Liu Sujuan Xie Longya Xu 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2013年第1期145-150,共6页
Effects of space velocity, reaction temperature and support acidity on product distribution and induction period in 1-butene isomerization and metathesis over Mo/mordenite-alumina were investigated. As revealed by the... Effects of space velocity, reaction temperature and support acidity on product distribution and induction period in 1-butene isomerization and metathesis over Mo/mordenite-alumina were investigated. As revealed by the catalytic performance results, induction period and objective product were closely related to the reaction conditions. Lower space velocity led to longer induction period and higher propene yield. The optimal reaction temperature for propene production is around 150 ~C and it shifted to 100 ~C for ethene production. 1-Butene auto-metathesis predominated in the reaction network if the support with lower degree of sodium exchanged. And propene gradually became the dominant product upon increasing the support sodium exchange degree. 6Mo/H100Na0M-30A1 catalyst with a support of full sodium exchange degree exhibited the highest propene yield. 展开更多
关键词 1-BUTENE metathesis PROPENE molybdenum production distribution induction period
下载PDF
Production of propene from 1-butene metathesis reaction on tungsten based heterogeneous catalysts 被引量:3
7
作者 Huijuan Liu Ling Zhang +5 位作者 Xiujie Li Shengjun Huang Shenglin Liu Wenjie Xin Sujuan Xie Longya Xu 《Journal of Natural Gas Chemistry》 EI CAS CSCD 2009年第3期331-336,共6页
A new propene production route from 1-butene metathesis has been developed on heterogeneous 10WO3/Al2O3-HY catalysts with different HY contents. It is found that the catalysts play bi-functionally first for the isomer... A new propene production route from 1-butene metathesis has been developed on heterogeneous 10WO3/Al2O3-HY catalysts with different HY contents. It is found that the catalysts play bi-functionally first for the isomerization of 1-butene to 2-butene and then for the cross-metathesis between 1-butene and 2-butene to propene and 2-pentene. The combination of HY zeolite and Al2O3 is prerequisite for the production of propene. The propene yield keeps increasing with the HY content in the range of 10-70 wt%, where 10WO3/Al2O3-70HY exhibits the highest propene yield. The MS-H2-TPR and MS-O2-TPO characterizations indicate that the increase of HY content in the catalysts weakens the interaction between W species and supports, whereas enhance the probability of coking on the metal species and acid sites. 展开更多
关键词 PROPENE 1-BUTENE metathesis 10WO3/Al2O3-xHY bifunction
下载PDF
Cross metathesis of butene-2 and ethene to propene overMo/MCM-22-Al_2O_3 catalysts with different Al_2O_3 contents 被引量:2
8
作者 Shenglin Liu Xiujie Li +4 位作者 Wenjie Xin Sujuan Xie Peng Zeng Lixin Zhang Longya Xu 《Journal of Natural Gas Chemistry》 EI CAS CSCD 2010年第5期482-486,共5页
A series of 3.0Mo/MCM-22-Al2O3 catalysts with γ-Al2O3 contents in the range of 0-100 wt% were prepared and applied in the metathesis reaction of ethene and butene-2. Addition of γ-Al2O3did not affect the structure o... A series of 3.0Mo/MCM-22-Al2O3 catalysts with γ-Al2O3 contents in the range of 0-100 wt% were prepared and applied in the metathesis reaction of ethene and butene-2. Addition of γ-Al2O3did not affect the structure of MCM-22 zeolite as evidenced by XRD and N2 adsorption measurements. It was deduced from TPR experiments that γ-Al2O3 phase favored the formation of polymolybdate or multilayered Mo oxide, while more Al2(MoO4)3 species were generated over MCM-22 zeolites. Alumina content in the support was directly related to the metathesis activity of ethene and butene-2 to propene. Mo species with higher valence (Mo6+or Mo5+) contributed more to the excellent performance of catalyst than metallic Mo. The best catalyst activity and stability was obtained over 3.0Mo/(MCM-22-30%Al2O3) under the reaction condition of 1.0 MPa and 125℃ using N2 as the pretreatment gas. 展开更多
关键词 butene-2 ETHENE PROPENE metathesis Mo MCM-22-Al2O3
下载PDF
Effect of Reaction Temperature and Pressure on the Metathesis Reaction between Ethene and 2-Butene to Propene on the WO_3/Al_2O_3-HY Catalyst 被引量:2
9
作者 Shengjun Huang Shenglin Liu +3 位作者 Wenjie Xin Sujuan Xie Qingxia Wang Longya Xu 《Journal of Natural Gas Chemistry》 EI CAS CSCD 2006年第2期93-99,共7页
Effect of reaction temperature and pressure on the metathesis reaction between ethene and 2-butene to propene was studied on the WO3/γ-Al2O3-HY catalyst. The activity is found to increase with elevated temperature an... Effect of reaction temperature and pressure on the metathesis reaction between ethene and 2-butene to propene was studied on the WO3/γ-Al2O3-HY catalyst. The activity is found to increase with elevated temperature and reaches a plateau at 150-240 ℃. After that, the activity undergoes a remarkable decrement at too high temperature. The effect of temperature is elucidated by the oxidation state of tungsten species. The evaluation results also indicate that the stability is dependent on this reaction parameter. Medium pressure (0.5-0.8 MPa) is favorable for stability, while atmospheric pressure or too high pressure (〉1.0 MPa) deteriorates the stability. For explanation, UV Vis, FT-IR, O2-TPO, and TG techniques are used to characterize the spent catalysts. 展开更多
关键词 metathesis tungsten oxide catalyst temperature PRESSURE ETHENE 2-BUTENE PROPENE
下载PDF
Metathesis of 1-butene and 2-butene to propene over Re_2O_7 supported on macro-mesoporous γ-alumina prepared via a dual template method 被引量:2
10
作者 Lei Sang Sheng-Li Chen +5 位作者 Guimei Yuan Min Zheng Ju You Aicheng Chen Rui Li Lanjing Chen 《Journal of Natural Gas Chemistry》 EI CAS CSCD 2012年第2期105-108,共4页
Macro-mesoporous γ-alumina support(MMA) was prepared by a sol-gel route in aqueous medium using pseudo-boehmite as aluminum source and polystyrene microspheres and Pluronic P123 as hard and soft dual templates,resp... Macro-mesoporous γ-alumina support(MMA) was prepared by a sol-gel route in aqueous medium using pseudo-boehmite as aluminum source and polystyrene microspheres and Pluronic P123 as hard and soft dual templates,respectively.MMA had a BET specific surface area of about 259 m2 g-1,total pore volume of about 1.61 cm3 g-1,macropore diameter of about 102 nm,and mesopore diameter of about 14 nm.Re2O7/MMA and conventional Re2O7/Al2O3 were prepared by a incipient-wetness impregnation method,and their catalytic performances in the metathesis of 1-butene and 2-butene were tested in a fixed-bed tubular reactor.The result showed that Re2O7/MMA possessed higher activity and far longer working life-span than conventional Re2O7/Al2O3. 展开更多
关键词 butene metathesis PROPENE rhenium oxide polystyrene microspheres macro-mesoporous alumina
下载PDF
Role of support nature (γ-Al_2O_3 and SiO_2-Al_2O_3) on the performances of rhenium oxide catalysts in the metathesis of ethylene and 2-pentene 被引量:1
11
作者 Weena Phongsawat Benjamas Netiworaruksa +3 位作者 Kongkiat Suriye Siraprapha Dokjampa Piyasan Praserthdam Joongjai Panpranot 《Journal of Natural Gas Chemistry》 EI CAS CSCD 2012年第2期158-164,共7页
The metathesis of ethylene and 2-pentene was studied as an alternative route for propylene production over Re2O7/γ-Al2O3 and Re2O7/SiO2-Al2O3 catalysts. Both NH3 temperature-programmed desorption (NH3-TPD) and H2 t... The metathesis of ethylene and 2-pentene was studied as an alternative route for propylene production over Re2O7/γ-Al2O3 and Re2O7/SiO2-Al2O3 catalysts. Both NH3 temperature-programmed desorption (NH3-TPD) and H2 temperature-programmed reduction (H2-TPR) results showed that Re2O7/SiO2-Al2O3 exhibited stronger acidity and weaker metal-support interaction than Re2O7/γ-Al2O3. At 35 60℃, isomerization free metathesis was observed only over Re2O7/γ-Al2O3, suggesting that the formation of metal-carbene metathesis active sites required only weak acidity. Our results suggest that on the Re2O7/SiO2-Al2O3, hydrido-rhenium species ([Re]-H) were formed in addition to the metathesis active sites, resulting in the isomerization of the initial 1-butene product into 2-butenes. A subsequent secondary metathesis reaction between these 2-butenes and the excess ethylene could explain the enhanced yields of propylene observed. The results demonstrate the potential for high yield of propylene from alternative feedstocks. 展开更多
关键词 metathesis ISOMERIZATION propylene production 2-pentene RHENIUM
下载PDF
Preparation of mesoporous alumina with large pore size and their supported rhenium oxide catalysts in metathesis of 1-butene and 2-butene to propene 被引量:1
12
作者 Lei Sang Sheng-Li Chen +5 位作者 Guimei Yuan Zheng Zhou Rui Li Aicheng Chen Min Zheng Ju You 《Journal of Natural Gas Chemistry》 EI CAS CSCD 2012年第3期352-359,共8页
Mesoporous γ-aluminas with large pore size (up to 19 nm, denoted as MAI9) are prepared from dispersed pseudo-boehmite using pluronic P123 as template. It is found that these mesoporous alumina supported rhenium oxi... Mesoporous γ-aluminas with large pore size (up to 19 nm, denoted as MAI9) are prepared from dispersed pseudo-boehmite using pluronic P123 as template. It is found that these mesoporous alumina supported rhenium oxide catalysts were more active and have far longer working life-span in gas-phase metathesis of 1-butene and 2-butene to propene than rhenium oxide on conventional alumina with small pore size (5 nm). At 60 ℃ and atmospheric pressure with WHSV = 1 h^-1, the similar stable conversions of butene (ca. 55%) for all the 13 wt% Re207/alumina catalysts were obtained near the chemical equilibrium, and the stable working life-spans of Re2OT/MA19 were far longer than that of Re2O7/A1203, being about 70 h and 20 h, respectively. 展开更多
关键词 mesoporous alumina rhenium oxide metathesis BUTENE PROPENE
下载PDF
Influence of catalyst support structure on ethene/decene metathesis and coke formation over WO_3/SiO_2 catalyst 被引量:1
13
作者 Zheng Min Chen Sheng-Li +4 位作者 Zhang Jun-Hui Liu Yan Sang Lei You Ju Wang Xiao-Dong 《Petroleum Science》 SCIE CAS CSCD 2013年第1期112-119,共8页
8wt%WO3/SiO2 metathesis (disproportionation) catalysts with different pore structures were prepared by the incipient-wetness-impregnation method. The as-synthesized catalysts were characterized by N2 adsorpfion-deso... 8wt%WO3/SiO2 metathesis (disproportionation) catalysts with different pore structures were prepared by the incipient-wetness-impregnation method. The as-synthesized catalysts were characterized by N2 adsorpfion-desorption, scanning electron microscopy (SEM), X-ray diffraction (XRD), UV-visible diffuse reflectance spectroscopy (DRS) and scanning transmission electron microscopy-high-angle annular dark field (STEM HAADF). The results of STEM HAADF showed that WO3 species were not uniformly distributed on the SiO2 support. The experimental results of 8wt%WO3/SiO2 performance in ethene/decene metathesis revealed that the catalytic effect of 8wt%WO3/SiO2 catalyst and coke formation over it were closely related to the support pore structure: The 8wt%WO3/SiO2 catalyst with a more complicated pore structure showed better catalytic performance but the coke deposition rate was also faster. 展开更多
关键词 metathesis WO3/SiO2 catalysts pore structure coke formation
下载PDF
Self-metathesis of 1-butene to ethene and hexene over molybdenum-based heterogeneous catalysts 被引量:3
14
作者 Ce Guo Xiujie Li +6 位作者 Xiangxue Zhu Weifeng Chu Shenglin Liu Yuzhong Wang Peng Zeng Shujing Guo Longya Xu 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2018年第1期37-46,共10页
A novel route involving self‐metathesis of1‐butene under mild conditions that gave high yields ofethene and hexene was proposed.The results of thermodynamic analysis revealed that the Gibbsenergy of the target Metat... A novel route involving self‐metathesis of1‐butene under mild conditions that gave high yields ofethene and hexene was proposed.The results of thermodynamic analysis revealed that the Gibbsenergy of the target Metathesis I reaction(1‐butene?ethene+3‐hexene)was much higher thanthat of the main side Metathesis II(1‐butene+2‐butene?propene+2‐pentene).Suppression of1‐butene double‐bond isomerization was the key step to increase the selectivity for the target olefinin the reaction network.The relationship between the catalytic performance and support nature was investigated in detail.On basis of H2‐TPR,UV‐Vis spectra and HRTEM results,an alumina(Al2O3)support with large surface area was beneficial for the dispersion of molybdenum(Mo)species.Both suitable acidity and sufficient Mo dispersion were important to selectively promote the self‐metathesis reaction of1‐butene.On the optimal6Mo/Al2O3catalyst,1‐butene conversion reached47%and ethene selectivity was as high as42%on the premise of good catalytic stability(80°C,1.0MPa,3h?1).?2018,Dalian Institute of Chemical Physics,Chinese Academy of Sciences.Published by Elsevier B.V.All rights reserved. 展开更多
关键词 1‐Butene Self‐metathesis MOLYBDENUM ETHENE HEXENE
下载PDF
SYNTHESIS OF NOVEL BI-FUNCTIONAL COPOLYMER BEARING STERICALLY HINDERED PHENOL AND HINDERED AMINE GROUPS VIA RING-OPENING METATHESIS POLYMERIZATION 被引量:1
15
作者 Bo-yong Xue Kenichi Ogata Akinori Toyota 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 2008年第5期525-531,共7页
Norbornene derivatives exo,endo-2-[2-(3,5-di-tert-butyl-4-hydroxyphenoxy)-acetoxy]methyl-5-norbornene(M1) and 3,3,5,5-tetramethyl-4-piperidinyl 5-norbornene-exo,endo-2-carboxylate(M2)were synthesized and polymerized b... Norbornene derivatives exo,endo-2-[2-(3,5-di-tert-butyl-4-hydroxyphenoxy)-acetoxy]methyl-5-norbornene(M1) and 3,3,5,5-tetramethyl-4-piperidinyl 5-norbornene-exo,endo-2-carboxylate(M2)were synthesized and polymerized by RuCl_2(=CHPh)(PCy_3)_2 to prepare a novel kind of bi-functional polymer bearing sterically hindered phenol(SHP)and hindered amine(HLAS)groups via ring-opening metathesis polymerization(ROMP).The resulting copolymers were characterized by gel permeation chromatography(GPC),~1H-NMR and differen... 展开更多
关键词 Sterically hindered phenol Hindered amine Ring-opening metathesis polymerization(ROMP)
下载PDF
Recent advance in high-pressure solid-state metathesis reactions 被引量:3
16
作者 Li Lei Leilei Zhang 《Matter and Radiation at Extremes》 SCIE EI CAS 2018年第3期95-103,共9页
High-pressure solid-state metathesis(HPSSM)reaction is an effective route to novel metal nitrides.A recent advance in HPSSM reactions is presented for a number of examples,including 3d transition metal nitrides(ε-Fe_... High-pressure solid-state metathesis(HPSSM)reaction is an effective route to novel metal nitrides.A recent advance in HPSSM reactions is presented for a number of examples,including 3d transition metal nitrides(ε-Fe_(3)N,ε-Fe_(3-x)Co_(x)N,CrN,and Co_(4)N_(x)),4d transition metal nitrides(MoNx),and 5d transition metal nitrides(Re_(3)N,WN_(x)).Thermodynamic investigations based on density functional theory(DFT)calculations on several typical HPSSM reactions between metal oxides and boron nitride indicate that the pressure could reduce the reaction enthalpy △H.High-pressure confining environment thermodynamically favors an ion-exchange process between metal atom and boron atom,and successfully results in the formation of well-crystalized metal nitrides with potential applications. 展开更多
关键词 High-pressure Solid-state metathesis reaction Metal nitrides
下载PDF
Comparison of the Kinetics of 1-Hexene Metathesis by Ruthenium Carbene Catalysts
17
作者 Chen Xi BAI Wen Zhen ZHANG +2 位作者 Ren HE Yan Hong SUN Xiao Ping CAI 《Chinese Chemical Letters》 SCIE CAS CSCD 2006年第7期988-990,共3页
A kinetic study of two ruthenium carbene catalysts, (PCy3)2Cl2Ru=CHPh 1 (Grubbs catalyst) and a new catalyst [1,3-bis(2,6-dimethylphenyl)4,5-dihydroimidazol-2-ylidene](PPh3) (Cl)2Ru-CHPh 3, were conducted in... A kinetic study of two ruthenium carbene catalysts, (PCy3)2Cl2Ru=CHPh 1 (Grubbs catalyst) and a new catalyst [1,3-bis(2,6-dimethylphenyl)4,5-dihydroimidazol-2-ylidene](PPh3) (Cl)2Ru-CHPh 3, were conducted in metathesis of 1-hexene. The kinetic behavior of these catalysts at 40, 50, 60 and 70℃ was compared. Complex 3 has the more active catalytic effect at temperatures 40-70℃. 展开更多
关键词 RUTHENIUM CARBENE metathesis.
下载PDF
Production of propylene from an unconventional metathesis of ethylene and 2-pentene over Re_2O_7/SiO_2-Al_2O_3 catalysts
18
作者 Weena Phongsawat Benjamas Netivorruksa +3 位作者 Kongkiat Suriye Siraprapha Dokjampa Piyasan Praserthdam Joongjai Panpranot 《Journal of Natural Gas Chemistry》 EI CAS CSCD 2012年第1期83-90,共8页
An unconventional metathesis of ethylene and 2-pentene over Re2O7/SiO2-A1203 catalysts has been studied as an alternative route for the production of propylene. Complete conversion of 2-pentene and propylene yield as ... An unconventional metathesis of ethylene and 2-pentene over Re2O7/SiO2-A1203 catalysts has been studied as an alternative route for the production of propylene. Complete conversion of 2-pentene and propylene yield as high as 88 wt% were obtained under mild reaction conditions at 35 ℃ and atmospheric pressure. Unlike the conventional metathesis of ethylene and 2-butenes in which isomerization is a competing side reaction, the isomerization of 1-butene product from the unconventional metathesis of ethylene and 2-pentene to 2-butenes can further react with excess ethylene in the feed, resulting in additional increase in propylene yield. The secondary metathesis reaction was found to be favored under ethylene/2-pentene (E/2P) molar ratio ≥3 and gas hourly space velocity (GHSV) ≤ 1000 h-1 at the reaction temperature of 35 ℃. No catalyst deactivation was observed during the 455 min time-on-stream under the selected reaction conditions. 展开更多
关键词 metathesis propylene production 2-pentene RHENIUM SILICA-ALUMINA
下载PDF
Synthesis,Structure,and Ring-opening Metathesis Polymerization of η~5-Pentamethylcyclopentadienyl-(η~5-exo-tricyclo [5.2.1.0^(2,6)]deca-2,5,8-trien-6-yl) Iron
19
作者 ZHAO Xi LI Bin XU Shan-sheng SONG Hai-bin WANG Bai-quan 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2009年第5期662-665,共4页
η^5-Pentamethylcyclopentadienyl-(η^5-exo-tricyclo[5.2.1.0^2,6]deca-2,5,8-trien-6-yl) iron(3) was synthesized and characterized by ^1H NMR, ^13C NMR, MS, elemental analysis, IR, UV and X-ray diffraction analysis.... η^5-Pentamethylcyclopentadienyl-(η^5-exo-tricyclo[5.2.1.0^2,6]deca-2,5,8-trien-6-yl) iron(3) was synthesized and characterized by ^1H NMR, ^13C NMR, MS, elemental analysis, IR, UV and X-ray diffraction analysis. Compound 3 was polymerized with ring-opening metathesis polymerization(ROMP) initiator (PCy3)2Cl2Ru=CHPh. ^1H NMR and IR spectra revealed the presence of CH=CH units in the polymer and supported the ROMP mechanism. GPC analysis of the polymer showed that the weight-average molecular weights(Mw) was 5967, and the polydispersity index(PDl) was 1.16. The polymer was also investigated by UV and cyclic voltammetry. 展开更多
关键词 FERROCENE metathesis Ring-opening polymerization Cyclic voltammetry X-ray diffraction
下载PDF
Synthesis and Catalytic Activity of a Two-core Ruthenium Carbene Complex: a Unique Catalyst for Ring Closing Metathesis Reaction
20
作者 SHAO Ming-bo WANG Jian-hui 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2011年第5期795-798,共4页
The reaction of a ruthenium carbide complex RuCl2(C:)(PCy3)2 with [H(Et2O)x]+[BF4]- at a molar ratio of 1:2 produced a two-core ruthenium carbene complex, {[RuCl(=CHPCy3)(PCy3)]2(μ-Cl)3}+·[BF4]-,... The reaction of a ruthenium carbide complex RuCl2(C:)(PCy3)2 with [H(Et2O)x]+[BF4]- at a molar ratio of 1:2 produced a two-core ruthenium carbene complex, {[RuCl(=CHPCy3)(PCy3)]2(μ-Cl)3}+·[BF4]-, in the form of a yellow-green crystalline solid in a yield of 94%. This two-core ruthenium complex is a selective catalyst for ring closing metathesis of unsubstituted terminal dienes. More importantly, no isomerized byproduct was observed for N-substrates when the two-core ruthenium complex was used as the catalyst at an elevated temperature(137 °C), indicating that the complex is a chemo-selective catalyst for ring closing metathesis reactions. 展开更多
关键词 Ruthenium carbene complex Ruthenium catalyst Ring closing metathesis Two-core
下载PDF
上一页 1 2 19 下一页 到第
使用帮助 返回顶部