搜索结果: 91-105 共查到“知识库 有机合成化学”相关记录1973条 . 查询时间(8.28 秒)
Synthesis and characterization of new optically active polyamides containing 2-(4-nitro-1,3-dioxoisoindolin-2-yl)succinic acid and aromatic diamines via direct polycondensation
Optically active polymers polyamides (PAs , thermal stability
2010/10/14
A new class of optically active polyamides (PAs) (6a-e) having 4-nitro-1,3-dioxoisoindolin-2-yl pendent groups were prepared by direct polycondensation reaction of 2-(4-nitro-1,3-dioxoisoindolin-2-yl)...
Influence of AlCl3 on the optical properties of new synthesized 3-armed poly(methyl methacrylate) films
Optical constants optical band gap dispersion parameters thin films ATRP PMMA
2010/10/14
Three-armed poly(methyl methacrylate)[PMMA] was synthesized by atom transfer radical polymerization at 100 °C using benzene-1,3,5-triyl tris(4-(bromomethyl) benzoate as 3-armed initiator and a cuprous...
Synthesis of some pyridazine derivatives carrying urea, thiourea, and sulfonamide moieties and their antimicrobial activity
Pyridazine derivatives antibacterial activity antifungal activity
2010/10/14
Some pyridazine derivatives carrying urea, thiourea, and sulfonamide groups were synthesized and evaluated for their antimicrobial activity against gram-positive and gram-negative bacteria, and fungi ...
4H-Pyran-4-one derivatives:; leading molecule for preparation of compounds with antimycobacterial potential
Antimycobacterial activity DNA gyrase activity hydroxy-4H-pyran-4-one
2010/4/8
A series of 3-hydroxy-6-methyl-2-((4-substitutedpiperazin-1- yl)methyl)-4H-pyran-4-one structured compounds were synthesized by reacting 5-hydroxy-2-methyl-4H-pyran-4-one with suitable piperazine deri...
An efficient one pot synthesis of 1,4-dihydropyridines using alumina sulfuric acid (ASA) catalyst
Hantzsch 1 4-dihydropyridines ASA catalyst one pot conversion
2010/4/8
An efficient synthetic method for 1,4-dihydropyridines has been developed using 3 or 4 component condensation reactions of aldehydes, 1,3-dicarbonyl compounds, and ammonium acetate in the presence of ...
A simple and efficient one-pot multicomponent synthesis of b-acetamido carbonyl compounds with Zn(HSO4)2 and Co(HSO4)2 as catalysts
Darking-West reaction metal catalysis acatamido carbonyl compounds
2010/4/8
Zn(HSO4)2 and Co(HSO4)2 has been used as efficient catalysts for the preparation of b-acetamido carbonyl compounds by Dakin-West reaction.
2-硝基丙烯热解反应的理论研究
2-硝基丙烯 热解反应 中间体 过渡态 LCAO-MO-AM1
2009/12/11
利用MO-AM1方法研究了2-硝基丙烯热解的反应途径。结果表明, 2-硝基丙烯可能首先热解产生一个四元环状中间体。该中间体依照分步过程继续分解时, 存在两种可能的途径, 其中先断N—O键的反应过程比先断C—C键的过程从能量上更为有利。反应过程中电荷无明显转移, 具有双自由基反应特点。
生物质热解液化产物制备酚醛树脂研究进展
生物质 热解 生物质油 酚醛树脂
2012/8/4
在介绍热解制备富含酚类物质液化产物的生物质原料的基础上,综述了快速热解油、真空热解油、高压热解油、常压苯酚液化产物、木质素酚解产物及生物油抽提分离产物等生物质热解液化产物制备酚醛树脂及其应用现状,并指出了生物质热解液化产物替代酚类化合物制备酚醛树脂存在成本较高、反应活性较低、尺寸稳定性较差等问题,利用造纸黑液木质素与树皮制备酚醛树脂将成为重要方向。
微波强化膨润土的改性及其作用机理
膨润土 改性 微波 机理
2009/11/9
在半干条件下采用微波辐射，制备了钠基及有机膨润土. 实验方法为先用溶解有改性剂的少量乙醇溶液与原料膨润土混合，然后把所得到的半干物料置于微波场中进行加热反应，最后通过洗涤、过滤及干燥得到产品. 与传统的湿法改性相比较，微波半干法不但钠化和有机化反应时间分别缩短60倍和90倍，而且由于反应后洗涤及过滤容易，产率分别提高11.5%和16%. 通过对影响反应的因素进行分析，探讨了微波的作用机理，认为微波...
2-噻吩甲酸(5-氟尿嘧啶-1-基)甲酯的合成、晶体结构和热性质
2-噻吩甲酸 5-氟尿嘧啶
2009/11/9
报道了一种新的5-氟尿嘧啶衍生物2-噻吩甲酸（5-氟尿嘧啶-1-基）甲酯的合
合成了新试剂1-(2-萘酚-4-磺酸)-3-[4-(苯基偶氮)苯基]-三氮烯（NASAPAPT），研究了该试剂与阴离子表面活性剂(AS)十二烷基硫酸钠、十二烷基苯磺酸钠的显色反应的条件．试剂和十二烷基硫酸钠、十二烷基苯磺酸钠形成配合物的最大吸收分别位于441nm和432nm，表观摩尔吸光系数为1.51×104 L·mol-1·cm-1和2.29×104 L·mol-1·cm-1．建立了水相测定微量...
2,6-二氯-4-三氟甲基苯胺溶于乙酸乙酯溶剂中，在POCl3催化下合成N-(2,6-二氯-4-三氟甲基)苯基乙酰胺，此反应条件温和，易于控制，产率达到85%．通过1H NMR、13C NMR、19F NMR、IR对其结构进行表征，并利用单晶X射线衍射法测定其结构．该晶体属单斜晶系，空间群为C 2/c，晶体学参数为：a=19.739(2)Ǻ，b =12.0183(14)Ǻ，c ...
二氯卡宾与苯环加成反应机理的量化研究
苯环 二氯卡宾
2009/11/2
用限制的Hartree-Fock从头算分子轨道理论研究了单重态二氯卡宾与苯的环加成反应机理，采用HF/3-21G*方法计算了势能面上各驻点的构型参数、振动频率和能量．结果表明，该反应途径由两步组成：（I）两反应物（R1+R2）首先生成一复合物（CM），它是一无势垒的放热反应，放出的能量为5.70 kJ mol-1；（II）复合物（CM）经过渡态（TS）异构化为产物（P），其势垒为78.93 kJ ...
Synthesis of methyl (E)-2',4''-thiazachalcones and their N-alkyl derivatives, photochemistry with theoretical calculations and antimicrobial activities
Thiazachalcones N-decyl-4-thiazaclaconium bromide photodimerization antimicrobial activity
2010/4/8
A series of 9 new (E)-thiazachalcones (1-3), and their N-alkyl substituted derivatives (4-6), and stereoselective dimerization products (7-9) were synthesized, then tested for antimicrobial activity a...
Dynamic 1H-NMR demonstration of anomeric effect and structure: conformational and configurational analysis of N-2-(1,4-dioxane)-N'-(p-methylbenzenesulfonyl)- O-(p-methylphenoxy) İsourea
Anomeric effect dynamic NMR conformational analysis configurational analysis hydrogen bonds dioxane aminoimidoyl
2010/4/8
The conformational and configurational behavior and the structure of N-2-(1,4-dioxane)-N'-(p-methylbenzenesulfonyl)-O- (p-methylphenoxy) isourea (1) were studied using dynamic NMR. The endo-anomeric e...