PEG介质中2-[4-氨基-5-(2-苯并呋喃基)-4H-1,2,4-均三唑-3-巯基]-N-苯乙酰胺的合成

3-(2-苯并呋喃基)-4-氨基-5-巯基-1,2,4-三唑与氯乙酰苯胺衍生物在PEG-400介质中发生取代反应,制得相应的1,2,4-三唑-3-巯基-苯乙酰胺,产物结构经IR、NMR及元素分析进行了表征.结果表明,该方法具有产率高、污染少、操作简单、环境友好等优点.     

4-氨基-3-肼基-5-巯基-1,2,4-三唑的微波合成方法

本文采用微波合成技术,以水合肼和硫脲为原料一步合成得到4-氨基-3-肼基-5-巯基-1,2,4-三唑（AHMT）,并对最佳合成条件进行了摸索.考查了反应时间,微波功率,反应物用量对产率的影响.     

5-取代-4-氨基-1,2,4-三唑-3-硫酮席夫碱的合成

目的 研究5位有芳香基取代的4-氨基-1,2,4-三唑-3-硫酮席夫碱化合物.方法 以自制的5-邻硝基苯氧甲基-4-氨基-1,2,4-三唑-3-硫酮与取代芳香醛为原料,以醋酸为溶剂,回流反应.结果 合成了未见文献报道的7个三唑硫酮席夫碱类化合物,各化合物通过IR,1H NMR和元素分析确定了其分子结构.结论 该合成方法 简便、易行、收率高.     

原甲酸三乙酯法合成1-取代-1,2,4-三唑-5-酮

目的研究1-取代-1,2,4-三唑-5-酮合成的新方法。方法用原甲酸三乙酯和氨基甲酸乙酯为原料,磺基乙酸乙酯作为催化剂,合成中间体乙氧甲叉基氨基甲酸乙酯,然后在醋酸盐和三乙胺催化作用下,以二乙醇二甲醚为溶剂,和苯肼缩合环化,合成了1-苯基-1,2,4-三唑-5-酮。用同样的方法,改用取代苯肼为原料,1,4-二氧六环作溶剂,提高反应温度,又合成了3种1-取代-1,2,4-三唑-5-酮衍生物。结果合成的4种化合物产率都在60%以上,并且对这4种目标化合物的结构进行了表征。结论为1-取代-1,2,4-三唑-5-酮的合成提供了新途径,具有较好的应用前景。     

4-氨基-3,5-二（2-羟基苯基）-1,2,4-三唑的合成、表征及其光物理性能

为探索1,2,4-三唑衍生物的合成及光物理性能,通过改进的双酰肼环化法合成了4-氨基-3,5-二(2-羟基苯基)-1,2,4-三唑,分别讨论了反应物的投料比、反应温度、反应时间及催化剂对产率的影响;对目标化合物进行了IR,1H NMR,MS和元素分析等表征,并测试了其紫外、荧光,探讨了光物理性能.     

N-芳基-3-芳氧基-4-苯基-1,2,4-三唑-5-硫基乙酰胺的合成及生物活性

通过3-芳氧基-4-苯基-5-巯基-1,2,4-三唑和芳基氯乙酰胺在碱性条件下的硫烷基化反应,合成了14个2-(3-芳氧甲基-4-苯基-1,2,4-三唑-5-硫基)乙酰芳胺.化合物结构经元素分析、<'1>HNMR和IR进行了表征.生物活性试验表明部分化合物对小麦的根有促进作用,而对所有的茎都有抑制活性.     

3-(3-羟基丙基)-6-(4-甲氧基苯基)-7H-1,2,4-三唑并[3,4-b][1,3,4]噻二嗪合成及晶体结构

从γ-丁酸内酯出发,制得3-(3-羟基丙基)-4-氨基-5-巯基-1,2,4-三唑,它与4-甲氧基溴代苯乙酮反应,合成了3-(羟基丙基)-6-(4-甲氧基苯基)-7H-1,2,4并[3,4-b]-1,3,4-噻二嗪氢溴酸盐,通过元素分析、红外光谱、碳谱、氢谱进行表征,并利用单晶X-射线衍射法测定其结构.这是首次报道的三唑并噻二嗪类稠杂环化合物氢溴酸盐,晶体属单斜晶系,C2/c空间群,a=2.3101(17)nm,b=0.7207(5)nm,c=2.0201(16)nm,β=112.875(8)°,Z=8,F(000)=1552,R1=0.0472.     

2-（2-（1H-1,2,4-三唑）乙基）-3-乙酰基-2,5-二取代芳基-1,3,4-噁二唑啉类化合物的合成

在盐酸和乙醇存在下,苯乙酮、多聚甲醛以及N,N-二甲基甲酰胺进行Mannish反应,得到了Mannish碱;然后将其和1,2,4-三唑在水中反应,得到含有1,2,4-三唑的苯丙酮（1）;在冰醋酸催化下,（1）和4-取代苯甲酰肼（2）进行缩合,得到一系列含有1,2,4-三氮唑的酰腙衍生物（3）;化合物（3）在乙酸酐的作用下环化生成一系列2-（2-（1H-1,2,4-三唑）乙基）-3-乙酰基-2,5-二取代芳基-1,3,4-噁二唑啉（4）.化合物（4）的结构经IR,1HNMR,MS,元素分析确证,同时用X-射线衍射法测定了化合物4a的晶体结构.     

7-取代苄氨基-4,5-二氢-[1,2,4]三唑并[4,3-a]喹啉类衍生物的合成及抗惊厥作用研究

合成7-取代苄氨基-4,5-二氢-[1,2,4]三唑并[4,3-a]喹啉类衍生物,并进行了抗惊厥作用研究.抗戊四唑(PTZ)实验结果显示,7-(3-溴苄氨基)-4,5-二氢-[1,2,4]三唑并[4,3-a]喹啉(4j)的作用最强,其ED50为5.0mg/kg,保护指数PI为20.7,作用明显强于对照药物,安全性也明显优于对照药物;而抗电惊厥实验结果表明,7-(3-氟苄氨基)-4,5-二氢-[1,2,4]三唑并[4,3-a]喹啉(4i)的作用最强,其ED50为15.3mg/kg,保护指数PI为7.2.同时用旋转棒法测定了化合物的神经毒性,其结果显示目标化合物的神经毒性均较低.     

2,5-双-1,2,4-三唑并[3,4-b]-1,3,4-噻二唑噻吩类衍生物的合成及其抗菌活性研究

芳香羧酸经酯化、肼解、成盐、环化成3-芳基4-氨基-5-巯基-1,2,4-三唑(1a～1h),然后与噻吩-2,5-二羧酸在相转移催化剂四丁基碘化铵和POCl3,作用下,高产率地制得了8种2,5-双-1,2,4-三唑并[3,4-6]-1,3,4-噻二唑噻吩类衍生物(3a～3h),并利用IR、1H NMR、MS和元素分析对目标化合物的结构进行了表征.初步的抗菌试验表明,部分目标化合物表现出较好的抑菌活性.     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that