搜索结果: 106-120 共查到“知识库 有机合成化学”相关记录1973条 . 查询时间(3.184 秒)
氟两相体系在有机合成中的应用
有机合成 氟两相体系
2009/10/30
氟两相体系是一种新的相分离和固定化技术，它实现了均相反应多相化，只需经过简单的相分离即可实现反应产物的分离、提纯、和催化剂的再生．本文介绍了氟两相体系的特点并对氟两相体系在烯烃的氢甲酰化、酯化反应以及其它有机反应中的广泛应用进行了综述．
Oxorhenium(V)-mediated syntheses and structures of oxypyridinium-ammonium zwitterions
Oxorhenium(V) oxypyridinium-ammonium zwitterions
2010/4/8
Treatment of N,N-bis(2-hydroxybenzyl)-2-(2-aminoethyl) dimethylamine (H2had) with trans-[ReO2(py)4]I in acetone affords the iodide salts of the oxypyridinium-ammonium zwitterions N1-(2-hydroxybenzyl)-...
乙酰化EGCG的制备研究
EGCG 乙酰化衍生物 纯化 制备
2009/9/16
通过对EGCG乙酰化衍生反应中条件的控制来合成全取代的乙酰化产物，反应产物再经初步纯化与柱层析再纯化2个过程制备得到了高纯度的乙酰化衍生物。
超临界CO2在酶法合成共轭亚油酸中的应用
超临界CO2 亚油酸异构酶 共轭亚油酸
2009/9/4
［目的］探讨在超临界CO2中利用嗜酸乳杆菌亚油酸异构酶转化亚油酸、合成共轭亚油酸（CLA）的可行性。［方法］以嗜酸乳杆菌亚油酸异构酶为研究对象，在考察底物溶解性、酶粉经超临界CO2处理后活性变化的基础上，研究超临界CO2温度、压力、酶粉的记忆pH和水分活度对共轭亚油酸合成的影响。
［结果］结果表明，底物亚油酸在超临界CO2中的溶解度随压力和温度而改变，当压力超过15 MPa时，底物开始具...
Comparative study of selective CO oxidation over Pt-Co-M/Al2O3 catalysts (M=Ce, Mg, Mn, Zr, Fe) in hydrogen-rich streams: effects of a second promoter
Selective CO oxidation promoted Pt catalysts Pt-Co/Al2O3 catalyst fuel cell fuel processor
2010/4/8
The selective CO oxidation over Pt-Co/Al2O3 catalyst in hydrogen-rich streams was studied in the presence of Ce, Mg, Mn, Ze, and Fe as the second promoters. The catalysts were prepared using incipient...
2,2'-Binaphthylene phosphorochloridite (BINOL-PCl) as a bulky and efficient reagent for the conversion of primary and secondary alcohols into iodides, and tertiary alcohols stereo- and/or regioselectively into olefin(s)
Alkyl iodide 2,2'-dihydroxy-1,1'-dinaphthalene (BINOL) 2,2'-binaphthylene phosphorochloridite (BINOL-PCl) stereoselective anti-E2 elimination reaction heavy atom effect
2010/4/8
Primary and secondary alcohols were transformed in high yield to corresponding iodides by 4-chloro-3,5-dioxaphosphacyclohepta [2,1-a; 3,4-a'] dinaphthalene (BINOL-PCl) at room temperature. The tertiar...
Performance analysis for direct 2-propanol fuel-cell based on Pt containing anode electrocatalysts
Propanol Fuel cell Performance Electrocatalyst
2010/4/8
Direct 2-propanol cell performance based on Pt containing anode electrocatalyst was evaluated. Cell performance, open circuit voltage, maximum current density, and maximum power density were measured ...
Synthesis and in vitro anti-Helicobacter pylori activity of 2-(substituted benzylthio)-5-(5-nitro-2- furyl)-1, 3, 4-thiadiazole derivatives
1,3,4-Thiadiazole nitrofuran anti-Helicobacter pylori activity
2010/4/8
Starting from (5-nitrofuran-2-yl)methylene diacetate, a new series of 2-[(substituted benzyl)thio]-5-(5-nitro-2-furyl)-1,3,4-thiadiazoles (6a-n) were synthesized and the structures of the compounds we...
Application of FAM ligands in the metal-promoted catalytic enantioselective synthesis of organic compounds
the metal-promoted catalytic synthesis of organic compounds
2010/4/8
Novel ferrocenyl substituted aziridinyl methanol (FAM) ligands were synthesized and successfully used in metal-promoted catalytic enantioselective azomethine ylide cycloadditions, diethylzinc addition...
The synthesis, characterization and energy transfer efficiency of a dithienylpyrrole and BODIPY Based Donor-Acceptor System
Fluorescence Resonance Energy Transfer Donor-Acceptor System Dithienylpyrrole BODIPY
2010/4/8
A dithienylpyrrole-BODIPY based donor-acceptor system with 1,4-phenylene spacer as a model system for energy transfer was designed and synthesized. Absorption and emission spectra have revealed an eff...
Investigation of the fuel properties of biodiesel produced over an alumina-based solid catalyst
Biodiesel fuel properties transesterification heterogeneous basic catalyst
2010/4/9
The present study investigated the transesterification process used in the production of canola oil methyl ester from canola oil and methanol over synthesized KF/Al2O3 catalysts. Different amounts of ...
Synthesis and Antimicrobial Activity of Dinaphtho[2,1-b]furan-2-yl-methanone and Their Oxime Derivatives
Antimicrobial activity Naphtho[2,1-b]furan Benzofuran Ketoxime
2010/4/9
The reaction of 2-hydroxy-1-naphthaldehyde with 1,3-dichloroacetone and potassium carbonate was used to prepare dinaphtho[2,1-b]furan-2-yl-methanone (1) as starting reagents. In order to obtain dinaph...
Synthesis and evaluation of phenytoin derivatives as anticonvulsant agents
Phenytoin hydantoin anticonvulsant activity
2010/4/9
2,5-Dioxo-4,4-diphenylimidazolidine-1-carboxylic acid (2) was reacted with methyl ester of different amino acids (1a-c) and substituted benzhydrols (3a-b) in pyridine and in the presence of N,N dicycl...
Methanol dehydration reaction to produce clean diesel alternative dimethylether over mesoporous aluminosilicate-based catalysts
DME aluminosilicate silicotungstic acid methanol dehydration
2010/4/9
Due to its good burning characteristics and high cetane number, dimethylether (DME) is considered as a highly attractive and clean alternative to diesel fuel. This ether can be produced by methanol de...
Spectroscopic and Structural Study of Ni(II) Dipicolinate Complex with 2-amino-4-methylpyrimidine
Metal(II)-dipicolinate complexes X-ray crystal structure UV-Vis IR
2010/4/9
Nickel(II) dipicolinate complex containing 2-amino-4- methylpyrimidine (2A-4Mpy), [Ni(2A-4Mpy)(dpc) (H2O)2] . 2H2O was synthesized in solid state and its structural and spectroscopic properties were d...