期刊文献+
共找到146篇文章
< 1 2 8 >
每页显示 20 50 100
THE APPLICATON OF ULTRASOUND TO THE DI-ALKYLATION AND CYCLO-DI-ALKYLATION OF ETHYL CYANOACETATE UNDER SOLID-LIQUID PHASE TRANSFER CONDITIONS
1
作者 Qi Jun LIN Cheng Ru ZHANG Department of Chemistry,Shandong University,Jinan,250100.Yong Ming ZHANG Binzhou Medical College,Binzhou,Shandong.Wen Zhen SONG Qin QIU Experimental Centre,Shandong University,Jinan,250100. 《Chinese Chemical Letters》 SCIE CAS CSCD 1991年第7期517-520,共4页
Comparative experiments show that ultrasonic irradiation reduces the reaction times and improves the yields in the di-alkylation and cyclo-di-alkylation of ethyl cyanoacetate under solid-liquid phase transfer conditions.
关键词 PTC US THE APPLICATON OF ULTRASOUND TO THE DI-ALKYLATION AND CYCLO-DI-ALKYLATION OF ETHYL cyanoacetate UNDER SOLID-LIQUID PHASE TRANSFER CONDITIONS DI
下载PDF
Synthesis and Crystal Structure of Ethyl 2-(2-Amino-3-ethoxycarbonyl-4H-benzopyran-4-yl)cyanoacetate
2
作者 史达清 王香善 +2 位作者 屠树江 姚昌盛 王玉成 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 北大核心 2002年第1期60-63,共4页
The title compound ethyl 2-(2-amino-3-ethoxycarbonyl-4H-benzopyran-4-yl) cyanoacetate(C17H18N2O5, Mr=330.33) was obtained by the reaction of salicylaldehyde with ethyl cyanoacetate in DMF at room temperature catalyzed... The title compound ethyl 2-(2-amino-3-ethoxycarbonyl-4H-benzopyran-4-yl) cyanoacetate(C17H18N2O5, Mr=330.33) was obtained by the reaction of salicylaldehyde with ethyl cyanoacetate in DMF at room temperature catalyzed by KF-Al2O3. The crystal is monoclinic, space group P21/n, with unit cell constants a =9.277(3), b =8.521(2), c =21.320(2)? b =93.72(2)? Z =4, V =1681.8(7)?, Dc =1.305g/cm3, m (MoKa) =0.097mm-1, F(000) =696, R =0.0426, Rw =0.0970 for 3042 observed reflections(I>2s(I)). X-ray analysis reveals that interatomic distance for C(8)C(9) is 1.359(3)? which shows that it is C=C double bond. In addition, there are hydrogen bonds in the molecule. 展开更多
关键词 crystal structure ethyl cyanoacetate synthesis
下载PDF
(9H-氧杂蒽-9-羰基)甘氨酸乙酯的电化学合成研究
3
作者 张佳慧 胡洋洋 +3 位作者 孙靖文 刘慧莹 陶轶 刘磊 《化工管理》 2024年第14期138-142,共5页
甘氨酸乙酯类结构作为许多生物活性化合物的关键结构基序和多用途的构建模块,一直是研究的热点。利用绿色可持续的电力作为输出能源,以氧杂蒽和异氰基乙酸乙酯为原料,通过电催化酰化反应来合成(9H-氧杂蒽-9-羰基)甘氨酸乙酯,利用核磁共... 甘氨酸乙酯类结构作为许多生物活性化合物的关键结构基序和多用途的构建模块,一直是研究的热点。利用绿色可持续的电力作为输出能源,以氧杂蒽和异氰基乙酸乙酯为原料,通过电催化酰化反应来合成(9H-氧杂蒽-9-羰基)甘氨酸乙酯,利用核磁共振氢谱、核磁共振碳谱和质谱对其结构进行表征,并考察了在不同电极、电解质、电流、溶剂、温度条件下对其产率的影响。该方法收率较高,产物的原材料易获取,为合成甘氨酸乙酯类结构提供了一种独特的方案。 展开更多
关键词 电化学合成 氧杂蒽 异氰基乙酸乙酯 甘氨酸乙酯
下载PDF
Sensitivity of green and blue-green algae to methyl tert-butyl ether 被引量:6
4
作者 CHEN Jianmeng MA Jianyi +3 位作者 CAO Wei WANG Pinwei TONG Senmiao SUN Yizhao 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2009年第4期514-519,共6页
The toxicity of methyl tert-butyl ether (MTBE) to Chlorella ellipsoidea and Aphanizomenon flos-aquae was tested and assessed for a 15-d incubation with concentrations of MTBE from high (2.00×10^4 mg/L) to low... The toxicity of methyl tert-butyl ether (MTBE) to Chlorella ellipsoidea and Aphanizomenon flos-aquae was tested and assessed for a 15-d incubation with concentrations of MTBE from high (2.00×10^4 mg/L) to low (2 mg/L). The results showed that the toxicity was low when the concentration of MTBE was in the range 1.00× 10^4-2.00× 10^4 mg/L (the greatest inhibition of growth-rate was 70%-71%, occurred during the day 1-5). Low concentrations (2-500 rag/L) stimulated algal growth up to the greatest effect of 85%-200% when the concentration of MTBE was 50-100 mg/L during day 3-5. The toxicity of MTBE (72-120 h EC50) was 6.65×10^3-9.58×10^3 mg/L for C. ellipsoidea and that is 1.14× 10^4-2.00× 10^4 mg/L for A. floc-aquae. We found that the toxicity and ecological risk of MTBE for the algal community structure were low and the toxicity was influenced by the duration time of the test. 展开更多
关键词 methyl tert-butyl ether TOXICITY green algae ecological risk CYANOBACTERIA
下载PDF
Tert-butylation of Toluene with Tert-butyl Alcohol over Realuminated H-mordenite Zeolite 被引量:4
5
作者 周志伟 武文良 +1 位作者 王军 曾崇余 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2009年第2期195-199,共5页
The realuminated H-mordenite catalysts (HM1-4) treated with different concentrations of NaOH and NaAlO2 aqueous solutions were prepared, and characterized by inductively coupled plasma (ICP), X-ray diffraction (... The realuminated H-mordenite catalysts (HM1-4) treated with different concentrations of NaOH and NaAlO2 aqueous solutions were prepared, and characterized by inductively coupled plasma (ICP), X-ray diffraction (XRD), Fourier transform-infrared spectroscopy (FT-IR) and temperature-programmed desorption of ammonia, They are of lower Si/AI ratio and higher acid amount while keeping a high relative crystallinity. Their catalytic performances were evaluated with the liquid-phase tert-butylation of toluene with tert-butyl alcohol in a 100 ml stainless steel batch reactor equipped with a stirrer. HM2 zeolite catalyst, obtained by treating HM in 0.1 mol.L-1 NaOH followed by 0.05 mol·L^-1 NaAlO2 aqueous solution, shows a higher catalytic activity because of its highest acid amount. For HM2 catalyst the influences of reaction conditions on catalytic performance were investigated. The conversion of toluene is 50.3% and the selectivity ofp-tert-butyltoluene is 74.7% at a temperature of 180℃, 2 of molar ratio of tert-butyl alcohol to toluene, 4h of reaction time and 0.2 of M(catalyst)/M(toluene). 展开更多
关键词 realuminated H-mordenite TOLUENE tert-butyl alcohol P-tert-butylTOLUENE
下载PDF
Aerobic degradation of methyl tert-butyl ether by a Proteobacteria strain in a closed culture system 被引量:5
6
作者 ZHONG Wei-hong CHEN Jian-meng LU Zheng CHEN Dong-zhi CHEN Xiao 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2007年第1期18-22,共5页
The contamination of methyl ten-butyl ether (MTBE) in underground waters has become a widely concerned problem all over the world. In this study, a novel dosed culture system with oxygen supplied by H2O2 was introdu... The contamination of methyl ten-butyl ether (MTBE) in underground waters has become a widely concerned problem all over the world. In this study, a novel dosed culture system with oxygen supplied by H2O2 was introduced for MTBE aerobic biodegradation. After 7 d, almost all MTBE was degraded by a pure culture, a member of β-Proteobacteria named as PMI, in a closed system with oxygen supply, while only 40% MTBE was degraded in one without oxygen supply. Dissolved oxygen (DO) levels of the broth in closed systems respectively with and without H2O2 were about 5-6 and 4 mg/L. Higher DO may improve the activity of monooxygemase, which is the key enzyme of metabolic pathway from MTBE to tert-butyl alcohol and finally to CO2, and may result in the increase of the degrading activity of PM1 cell. The purge and trap GC-MS result of the broth in closed systems showed that tea-butyl alcohol, isopronol and acetone were the main intermediate products. 展开更多
关键词 methyl tert-butyl ether BIODEGRADATION β-Proteobacteria intermediate products
下载PDF
The Inhibition Effect of Tert-Butyl Alcohol on the TiO_2 Nano Assays Photoelectrocatalytic Degradation of Different Organics and Its Mechanism 被引量:4
7
作者 Xuejin Li Jinhua Li +3 位作者 Jing Bai Yifan Dong Linsen Li Baoxue Zhou 《Nano-Micro Letters》 SCIE EI CAS 2016年第3期221-231,共11页
The inhibition effect of tert-butyl alcohol(TBA), identified as the·OH radical inhibitor, on the TiO_2 nano assays(TNA) photoelectrocatalytic oxidation of different organics such as glucose and phthalate was repo... The inhibition effect of tert-butyl alcohol(TBA), identified as the·OH radical inhibitor, on the TiO_2 nano assays(TNA) photoelectrocatalytic oxidation of different organics such as glucose and phthalate was reported. The adsorption performance of these organics on the TNA photoelectrode was investigated by using the instantaneous photocurrent value, and the degradation property was examined by using the exhausted reaction. The results showed that glucose exhibited the poor adsorption and easy degradation performance, phthalate showed the strong adsorption and harddegradation, but TBA showed the weak adsorption and was the most difficult to be degraded. The degradation of both glucose and phthalate could be inhibited evidently by TBA. But the effect on glucose was more obvious. The different inhibition effects of TBA on different organics could be attributed to the differences in the adsorption and the degradation property. For instance, phthalate of the strong adsorption property could avoid from the capture of·OH radicals by TBA in TNA photoelectrocatalytic process. 展开更多
关键词 tert-butyl alcohol PHOTOELECTROCATALYSIS TiO2 NANO assays HYDROXYL RADICAL inhibitor Inhibition effect
下载PDF
Porous alumina ceramic via gelcasting based on2-hydroxyethyl methacrylate dissolved in tert-butyl alcohol 被引量:4
8
作者 Xiao-feng WANG Yu-zhou XIE +3 位作者 Chao-qun PENG Ri-chu WANG Dou ZHANG Yan FENG 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2019年第8期1714-1720,共7页
To obtain porous alumina ceramic with high strength,a novel gelcasting system based on 2-hydroxyethyl methacrylate(HEMA)dissolved in tert-butyl alcohol(TBA)was developed.The polymerization of the HEMA-TBA gelcasting s... To obtain porous alumina ceramic with high strength,a novel gelcasting system based on 2-hydroxyethyl methacrylate(HEMA)dissolved in tert-butyl alcohol(TBA)was developed.The polymerization of the HEMA-TBA gelcasting system,the thermal behavior of obtained green body,and the microstructures and mechanical properties of the sintered bodies were investigated by rheometer,TG-DSC,SEM and bending strength testing,respectively.The results show that,(1)10 mg/mL of the initiator(benzoyl peroxide)is the optimal amount for polymerization of this gelscasting system at 25 ℃;(2)The alumina suspension of the HEMA-TBA gelcasting system showing shear-thinning behavior is sufficiently low for gelcasting process;(3)The bending strength of porous alumina ceramic samples,whose porosities range from 42% to 56%,is from(8±0.5)to(91±4.5)MPa. 展开更多
关键词 GELCASTING POLYMERIZATION porous ceramic ALUMINA 2-hydroxyethyl methacrylate (HEMA) tert-butyl alcohol (TBA) bending strength
下载PDF
Determination of methyl tert-butyl ether(MTBE) in Chinese fuels by gas chromatography/mass spectrometry and gas chromatography/flame ionization detector 被引量:2
9
作者 LIUJie-min CHENGWei +1 位作者 WENMei-juan JIANGGui-bin 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2004年第4期553-555,共3页
A method was developed to determine the concentration of methyl tert-butyl ether(MTBE) in gasoline, diesel and heating oil by gas chromatography(GC) with mass spectrometry(GC-MS) or flame ionization detection(FID). Th... A method was developed to determine the concentration of methyl tert-butyl ether(MTBE) in gasoline, diesel and heating oil by gas chromatography(GC) with mass spectrometry(GC-MS) or flame ionization detection(FID). The diluted gasoline was directly injected into the GC, and the complete separation of MTBE from co-eluting hydrocarbons was not required. GC/MS or GC/FID method can be used to analyze MTBE in different concentration range and have good consistency. 展开更多
关键词 methyl tert-butyl ether(MTBE) GC/MS GC/FID
下载PDF
Synthesis and phosphorescent properties of two novel iridium (Ⅲ) complexes bearing bulky tert-butyl substituents 被引量:1
10
作者 Rong Huang Xiao Qiang Wei +2 位作者 Tai Ping Zhang Zhi Yun Lu Ming Gui Xie 《Chinese Chemical Letters》 SCIE CAS CSCD 2007年第9期1119-1123,共5页
The synthesis and phosphorescence properties of two novel Ir(Ⅲ)complexes bearing tert-butyl substituents,bis(4-tert-butyl-2- phenylbenzothiozolato-N,C^(2′))iridium(Ⅲ)(acetylacetonate)[(tbt)_2Ir(acac)]and bis(4-tert... The synthesis and phosphorescence properties of two novel Ir(Ⅲ)complexes bearing tert-butyl substituents,bis(4-tert-butyl-2- phenylbenzothiozolato-N,C^(2′))iridium(Ⅲ)(acetylacetonate)[(tbt)_2Ir(acac)]and bis(4-tert-butyl-1-phenyl-1H-benzimidazolato- N,C^(2′))iridium(Ⅲ)(acetylacetonate)[(tpbi)_2Ir(acac)],are reported,their molecular structures are confirmed by^1H NMR,ESI-MS and elementary analysis.Photoluminescence(PL)studies revealed that they can emit strong green and orange phosphorescence in high quantum yields.Compared to their prototypes lacking of tert-butyl substituents,the two novel iridium(Ⅲ)complexes both have shorter lifetimes and improved or nearly similar PL quantum efficiencies,implying that the exciton quenching is inhibited effectively when molecular steric hindrance increases.The two chelates have great potential to be used as electrophosphorescent materials. 展开更多
关键词 SYNTHESIS tert-butyl substituent Phosphorescence ELECTROPHOSPHORESCENCE
下载PDF
2D-Cell Experiment on Methyl Tert-Butyl Ether Transport in Saturated Zone of Groundwater 被引量:1
11
作者 Li Hong Li Xingang +2 位作者 Gao Chuanbo Huang Guoqiang Jiang Bin 《Chinese Geographical Science》 SCIE CSCD 2007年第3期275-279,共5页
As an additive of gasoline,methyl ten-butyl ether(MTBE)has a higher solubility in water,which is about 20 times as high as that of benzene.This characteristic results in MTBE dissolving out of the gasoline into the so... As an additive of gasoline,methyl ten-butyl ether(MTBE)has a higher solubility in water,which is about 20 times as high as that of benzene.This characteristic results in MTBE dissolving out of the gasoline into the soil and groundwater.Due to relative unique physicochemical behavior of MTBE it would be an ideal candidate for use in environmental forensic investigations.In order to study the transport and distribution of MTBE in saturated zone of ground water,a two-dimensional experimental cell was setup to simulate the real environment of the groundwater flow.The effects of soil and groundwater flow velocity on the MTBE transport were investigated.The results show that the mobile distance of MTBE in vertical direction was smaller than that in horizontal direction paralleling with the groundwater flow.Because the main dynamics of groundwater flow direction was convection and dispersion,the movement of MTBE is also diffusion in the vertical direction.In addition,the transport of MTBE was more quick in high permeability porous media,and the increase of groundwater flow velocity can accelerate the MTBE plume development,but the irregularity and randomness of the plume are enhanced synchronously.These research results can give some helps for the investigation of MTBE movement in the groundwater,also can make some references for other petroleum contamination behavior. 展开更多
关键词 Methyl tert-butyl Ether pollutant transport GROUNDWATER 2D-sandbox
下载PDF
Measurements and correlation of liquid–liquid equilibrium data for the ternary(methyl tert-butyl ketone + o, m, p-benzenediol + water)system at(333.2, 343.2 and 353.2) K 被引量:1
12
作者 Kangning Xiong Shuai Shen +1 位作者 Youchang Wang Yun Chen 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2019年第4期905-911,共7页
In this work, liquid–liquid equilibria(LLE) data for the ternary system methyl tert-butyl ketone(MTBK)+ o, m,p-benzenediol + water were investigated at 333.2 K, 343.2 K and 353.2 K under 101.3 kPa. The performance of... In this work, liquid–liquid equilibria(LLE) data for the ternary system methyl tert-butyl ketone(MTBK)+ o, m,p-benzenediol + water were investigated at 333.2 K, 343.2 K and 353.2 K under 101.3 kPa. The performance of MTBK to extract o, m, p-benzenediol from wastewaters was estimated by partition coefficients and separation factors. The Hand and Bachman equations were both applied to check the reliability of the experimental LLE data. Furthermore, the Non-Random Two-Liquid(NRTL) and Universal Quasi Chemical(UNIQUAC) models were applied to correlate the measured LLE data. The results showed a good agreement with the determined ternary LLE data with the root-mean-square error(RMSE) values below 0.71%. MTBK was proved to be a promising extracting agent in extracting benzenediols from effluents. 展开更多
关键词 Liquid–liquid EQUILIBRIUM METHYL tert-butyl KETONE Benzenediol NRTL MODEL UNIQUAC MODEL
下载PDF
Surface Properties of the Microgels Based on N-isopropylacrylamide and Tert-butyl Acrylate by Using N,N′-methylene-bis(acrylamide) and Clay as Cross-linker 被引量:1
13
作者 张青松 路平 +2 位作者 查刘生 马敬红 梁伯润 《Journal of Donghua University(English Edition)》 EI CAS 2006年第5期36-40,共5页
Adopting N, N'-methylene-bis (aculamide) (MBA) and inorganic clay (hectorite) as chemical and physical crosslinking agent, respectively, a series temperature sensitive microgels, based on N-isopropylacrylamide ... Adopting N, N'-methylene-bis (aculamide) (MBA) and inorganic clay (hectorite) as chemical and physical crosslinking agent, respectively, a series temperature sensitive microgels, based on N-isopropylacrylamide (NIPAM) as a main monomer and tert-butyl acrylate (tBA) as a comonomer were synthesized by surfactant-free emulsion polymerization (SFEP). The microgel particle size and morphology was investigated by means of Atomic Force Microscope (AFM). The surface tension of latex particles was measured by OCA 40 Micro Video based contact angle measuring device. The results showed that the particle size of the microgels with clay as cross-linker was smaller than that using MBA as chemical cross-linker, but exterior morphology of physical microgels is not as clean and neat as chemical microgels. In general, surface tension decreases with increasing hydrophobic tBA content. These smart microgels varied with tetnperature have the potential applications in the field of drug delivery and intelligent gel fiber. 展开更多
关键词 N-ISOPROPYLACRYLAMIDE MICROGEL tert-butyl acrylate surface tension Atomic Force Microscope.
下载PDF
Optimizing the Synthesis of Ethyl tert-Butyl Ether in Continuous Catalytic Distillation Column Using New Ion Exchange Resin Catalyst 被引量:1
14
作者 Muhammad Umar Yahia Abubakar AI-Hamed Abdulraheem AI-Zahrani Hisham Saeed Bamufleh 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2013年第10期1121-1128,共8页
Liquid phase synthesis of one of the important fuel oxygenate, ethyl tert-butyl ether (ETBE), from etha-nol and tert-butyl alcohol (TBA) has been studied in catalytic distillation column (CDC) using ion exchange... Liquid phase synthesis of one of the important fuel oxygenate, ethyl tert-butyl ether (ETBE), from etha-nol and tert-butyl alcohol (TBA) has been studied in catalytic distillation column (CDC) using ion exchange resin catalyst CT-145H. A packed CDC of 1.2 m height and 50 mm diameter with indigenously developed reactive sec-tion packing was used to generate experimental data. Effect of different key variables on product purity in distillate, was investigated to find the optimum operating conditions for ETBE synthesis. The optimum conditions for 0.2 kg·s-1 of ethanol feed were found:reboiler duty of 375 W, molar feed ratio of 1︰1.3 of reactants, and reflux ratio of 7. Concentration profiles for each component along each column section at optimum conditions were also drawn. Neither output nor input multiplicity was observed at experimental conditions. 展开更多
关键词 ethyl tert-butyl ether synthesis catalytic distillation ion exchange resin catalyst packed column mul-tiplicity
下载PDF
Reactivity of 3-Cyanoacetylindole Derivatives: Synthesisof 3-Hydrazonopyrazolyl and 3-Thiadiazolyl Indole Derivatives
15
作者 Hamdi M. Hassaneen Huwaida M. E. Hassaneen Zakaria Ahmed Gomaa 《International Journal of Organic Chemistry》 2011年第3期97-104,共8页
The coupling reaction of 3-cyanoacetyl-2-methylindole 1a with the aromatic diazonium salts gave the corresponding arylhydrazones 2a-e. Compounds 2 were used for synthesis of 4-aminopyrazole-5-carbonitrile 4a-e and 5-a... The coupling reaction of 3-cyanoacetyl-2-methylindole 1a with the aromatic diazonium salts gave the corresponding arylhydrazones 2a-e. Compounds 2 were used for synthesis of 4-aminopyrazole-5-carbonitrile 4a-e and 5-amino-4-arylazo-3-pyrazoles 5a-e derivatives. Also, treatment of 3-cyanoacetyl-2-phenylindole 1b with phenyl isothiocyanate gave the corresponding thioacetanilide 7. The later compound 7 was utilized as the key intermediate for the synthesis of some new thiadiazole derivatives 9a-r. The structures of all new compounds were elucidated on the basis of elemental analysis and spectral data. 展开更多
关键词 3-Methyl INDOLE 3-Phenyl INDOLE PHENYL ISOTHIOCYANATE cyanoacetic Acid
下载PDF
Synthesis,Structure and DFT Calculations of a Novel Copper(Ⅱ)Complex Based on Tert-butyl 2-[N-(tert-butyloxycarbonylmethyl)-2-picolyamino]acetate 被引量:3
16
作者 程泽英 胡慧萍 +3 位作者 杨金鹏 邱雪景 王彩霞 姬广富 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2017年第5期795-804,共10页
A novel copper(Ⅱ) complex with tert-butyl 2-[N-(tert-butyloxycarbonylmethyl)-2-picolyamino]acetate(ampy) was synthesized and structurally characterized by elemental analysis, FT-IR spectrum, electrospray ioniza... A novel copper(Ⅱ) complex with tert-butyl 2-[N-(tert-butyloxycarbonylmethyl)-2-picolyamino]acetate(ampy) was synthesized and structurally characterized by elemental analysis, FT-IR spectrum, electrospray ionization-mass spectrometry, UV-vis spectrum and single-crystal X-ray diffraction, respectively. A mononuclear copper(II) complex with ampy, [Cu(ampy)Cl2](1), was formed irrespective of the metal-to-ligand molar ratios([Cu2+]:[ampy] = 0.5:1, 1:1, and 2:1) as a single product. Complex 1 crystallizes in the orthorhombic system, space group Pbca with a = 12.343(2), b = 18.928(3), c = 20.058(4) A, V = 4686.1(14) A3, Z = 8, Dc = 1.3349(4) g/cm3, F(000) = 1920, S = 1.016, R = 0.0693 and w R = 0.1721 for 3151 observed reflections with I 〉 2σ(I). X-ray diffraction analysis reveals that the central copper(II) ion is bound by pyridyl N, tertiary amine N and carbonyl O atoms of the quadridentate ampy as well as two Cl anions, constructing a slightly distorted octahedral geometry. Complex 1 further constructs a stable 3D supramolecular architecture by intermolecular C–H…Cl hydrogen bonds. In addition, the molecular geometry was calculated by density functional theory(DFT/B3LYP) method with the basis sets(6-31+G(d,p) for H, C, N, O and Cl atoms, and LANL2 DZ for Cu atom, respectively). The calculated results show that the optimized geometrical parameters are in good agreement with the experimental data. Natural bond orbital(NBO) analysis and frontier molecular orbitals(FMOs) analysis were investigated at the same level. 展开更多
关键词 copper(Ⅱ) complex crystal structure tert-butyl2-[N-(tert-butyloxycarbonylmethyl)-2-picolyamino]acetate (ampy) DFT calculation
下载PDF
Study on Pervaporation Membranes for Removing Methanol from C_5 or Methyl Tert-butyl Ether Mixtures
17
作者 张林 陈欢林 +3 位作者 周志军 钱锦文 高从堦 潘祖仁 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2003年第2期156-161,共6页
Several pervaporation membranes, cellulose acetate (CA), polyvinylbutyral (PVB), poly(MMA-co-AA), MMA-AA-BA, CA/PVB blend and CA/poly(MMA-co-AA) blend, were prepared, and their pervaporation properties were evaluated ... Several pervaporation membranes, cellulose acetate (CA), polyvinylbutyral (PVB), poly(MMA-co-AA), MMA-AA-BA, CA/PVB blend and CA/poly(MMA-co-AA) blend, were prepared, and their pervaporation properties were evaluated by separation of methanol/C5 or methanol/MTBE (methyl tert-butyl ether). The results shows that the CA composite membrane has a high separation performance (flux Jmenthanol =350g.m-2.h-1 and separation factor a > 400) for methanol/C5 mixtures, and the pervaporation characteristics of MMA-AA-BA copolymer membranes changes with the ratio of copolymer. For CA/poly(MMA-co-AA) blend membrane, the pervaporation performance is improved in comparison with CA or poly(MMA-co-AA) membrane. From the experiment of CA/PVB blend membranes for methanol/MTBE mixture, it is found that the compatibility of blends may affect the separation features of blend membrane. 展开更多
关键词 pervaporation membrane METHANOL C5 methyl tert-butyl ether BLEND
下载PDF
Phenol Tert-Butylation Catalyzed by Zeolite H-Mordenite
18
作者 韩森 李振花 张悝 《Transactions of Tianjin University》 EI CAS 2005年第2期89-91,共3页
Para-tert-butyl phenol (p-TBP) and 2,4-di-tert-butyl phenol (2,4-DTBP) are widely used for the preparation of antioxidants. Zeolite catalysts showed good performance for the synthesis of p-TBP and 2,4-DTBP. In this wo... Para-tert-butyl phenol (p-TBP) and 2,4-di-tert-butyl phenol (2,4-DTBP) are widely used for the preparation of antioxidants. Zeolite catalysts showed good performance for the synthesis of p-TBP and 2,4-DTBP. In this work, zeolite H-mordenite (HM) catalyst was prepared and the alkylation of phenol with tert-butyl alcohol over zeolite HM catalyst was investigated at different reaction conditions. It is found that increasing temperature enhances the selectivity to p-TBP and the optimum reaction temperature for phenol conversion is 438 K. Increasing flow rate decreases phenol conversion apparently while the selectivity to p-TBP has a little increase. The suitable tert-butyl alcohol/phenol molar ratio is 2. Lower alcohol/phenol molar ratios are beneficial to p-TBP while higher ones are helpful for producing 2,4-DTBP. 展开更多
关键词 PHENOL tert-butyl alcohol zeolite H-mordenite (HM) ALKYLATION
下载PDF
Catalytic Synthesis of Tert-Butyl Acetate by Nd_2O_3/Al_2O_3-Nd_2O_3/ZnO
19
作者 王亚军 韩利民 阿山 《Journal of Rare Earths》 SCIE EI CAS CSCD 2007年第S2期63-65,共3页
Nd2O3 was used to support Al2O3 and ZnO to prepare a supported solid base catalyst and investigate the effect of catalyst and reaction conditions on the synthesis of tert-butyl acetate. The composited oxide of Nd2O3/A... Nd2O3 was used to support Al2O3 and ZnO to prepare a supported solid base catalyst and investigate the effect of catalyst and reaction conditions on the synthesis of tert-butyl acetate. The composited oxide of Nd2O3/Al2O3-Nd2O3/ZnO exhibited excellent catalytic activity for the synthsis of tert-butyl acetate. The molar ratio of tert-butanol to acetic anhydride is 3∶1, the catalyst in total amount of reactant nearly 0.5%, and reaction time 6 h. With the above conditions, yield of the reaction could reach to 65%. The structure of product were verified by the FT-IR, Element analysis, and MS, which proved that the product was tert-butyl acetate. 展开更多
关键词 rare earth composited oxide catalytic synthesis tert-butyl acetate
下载PDF
The Synthesis of 4,5-Diphenyl-2-(2'-hydroxy-3'-tert-Butyl)-2-Oxazolines andTheir derivatives
20
《厦门大学学报(自然科学版)》 CAS CSCD 北大核心 1999年第S1期538-538,共1页
关键词 tert-butyl The Synthesis of 4 5-Diphenyl-2 hydroxy-3 Oxazolines andTheir derivatives
下载PDF
上一页 1 2 8 下一页 到第
使用帮助 返回顶部