甲酰基异长叶烯的合成新方法和产物的分离

报道了由２－羟甲基异长叶环烷和２－羟甲基异长叶烯直接用过量１００％的铬酸溶液，于０℃，在氮气中进行反应的合新方法，介绍了用梯度洗脱柱色谱分离了２－甲酰基异长叶环烷和２－甲酰基异长叶烯的方法。     

异长叶烯的制备工艺研究

通过比较几种Lewis酸对长叶烯异构化反应的催化效果,选择了LS-98作为长叶烯异构化反应的较为理想的催化剂。通过对异构化反应的温度、反应时间和溶剂用量等条件对比试验,选择了长叶烯异构化反应的工艺:以冰乙酸为溶剂,LS-98为催化剂,在30～40℃温度下反应3～4小时,90％以上的长叶烯转化为异长叶烯。     

复合催化剂催化重质松节油合成异长叶烯反应的研究

对复合催化剂催化重质松节油直接异构化合成异长叶烯的反应进行了研究,确定了较为理想的催化剂及相应的反应条件:复合催化剂为占重油质量3%H2SO4,加上占重油质量10%的y,异构化反应温度为60～70℃ ,反应时间为3.5h,异长叶烯产率达到83.9%.     

异长叶烯Prins反应及其产物的分离

探讨了异长叶烯的Prins反应条件及其产物的分离．异长叶烯的Prins反应产物主要有两种,这两种化合物很难分离,该文用柱层析成功地把这两种化合物分离出来,纯度可达97．2％．     

异长叶烷基噻唑类化合物的合成及其生物活性

【目的】将噻唑环构建至异长叶烷酮分子中,得到具有新型生物活性化合物,拓展松节油的应用领域,提高松节油的利用价值。【方法】异长叶烷酮与氨基硫脲缩合,生成异长叶烷酮缩氨基硫脲; 异长叶烷酮缩氨基硫脲再与α-溴代苯乙酮衍生物发生环化反应,得到11种异长叶烷基噻唑类化合物2a—2k。采用FT-IR、¹H NMR、¹³C NMR、HPLC-MS等手段,对合成产物的结构进行了表征。采用最低抑制浓度(MIC)法和MTT法分别研究了异长叶烷基噻唑类化合物的抑菌活性和抗肿瘤活性。【结果】化合物4-(4-氯苯基)-2-(2-(1,1,5,5)-四甲基四氢-1H-2,4α-桥亚甲基萘-8(2H,5H,8αH)-亚基)肼基)噻唑(2b)和4-(2-萘基)-2-(2-(1,1,5,5)-四甲基四氢-1H-2,4α-桥亚甲基萘-8(2H,5H,8αH)-亚基)肼基)噻唑(2j)对枯草芽孢杆菌与荧光假单胞菌抑制效果较好,其最低抑制浓度(MIC)为7.5 μg/mL,化合物2b对真菌(白色念球菌与热带假丝酵母菌)的抑制效果优于其他化合物,其MIC值均为15.6 μg/mL; 异长叶烷酮缩氨基硫脲对人体肝癌细胞HepG2 的半抑制浓度(IC₅₀)为(34.5±0.8)μg/mL,表明其对HepG2具有较好的抗癌活性。【结论】异长叶烷酮缩氨基硫脲可作为潜在的抗肿瘤药物。     

异长叶稀Prins反应产物的结构表征

本文介绍了用分级洗脱柱色谱分离技术分离7-乙酰氧甲基异长叶环烯和7-乙酰氧甲基异长叶烯的方法,并用IR、'HNMR、MS等手段对两个化合物的结构进行了表征.     

7-芳亚甲基异长叶烷酮类化合物的合成及其 紫外吸收特征

以异长叶烷酮为原料,采用叔丁醇钾为催化剂,分别与对溴苯甲醛、对氟苯甲醛、间硝基苯甲醛、2,4-二氯苯甲醛等进行缩合反应,合成了系列7-芳亚甲基异长叶烷酮类化合物a—j。采用¹H NMR、¹³C NMR、GC-MS和FT-IR等分析手段对合成所得7-芳亚甲基异长叶烷酮类化合物的结构进行了鉴定,并探索了化合物a—j的紫外吸收特性与光稳定性。结果表明:化合物a、b、c、d、j对中波紫外线(UVB)具有良好的吸收性能; 而化合物e、f、g、h和i对长波紫外线(UVA)和UVB均具有较好的吸收性能。化合物a—j的光稳定顺序为h>g>e>c>a>d>b>f>i>j,其紫外线吸收强度顺序为d>i>e>h>g>f>b>c>j>a。     

用S2O8^2—改性的TiO2固体超强酸催化合成异长叶烯

该文首次采用TiO2/S2O8^2-固体超强酸催化长叶烯异构化反应,并考察了催化剂制备方法,处理催化剂所用的（NH4）2S2O8溶液浓度,催化剂的焙烧温度、用量、反应温度及反应时间等因素对催化剂性能的影响,得出最佳反应条件,实验还表明TiO2/S2O8%2-固体超强度酸对长叶烯异构化反应具有很高的催化活性和选择性。     

用S_2O_8~(2-)改性的TiO_2固体超强酸催化合成异长叶烯

该文首次采用TiO2 /S2 O2 - 8固体超强酸催化长叶烯异构化反应 ,并考察了催化剂制备方法 ,处理催化剂所用的 (NH4 ) 2 S2 O8溶液浓度 ,催化剂的焙烧温度、用量、反应温度及反应时间等因素对催化性能的影响 ,得出最佳反应条件 .实验还表明TiO2 /S2 O2 - 8固体超强酸对长叶烯异构化反应具有很高的催化活性和选择性 .     

膜法富氧空气用于异长叶烯催化氧化研究

采用自制的聚二甲基硅氧烷/聚砜(PDMS/PSF)复合膜制备富氧空气,用于异长叶烯催化氧化,主产物为异长叶烯酮.通过实验,对富氧膜的性能进行了表征,并考察了富氧空气的氧浓度和富氧空气的流量对催化氧化反应的转化率及产率的影响,结果表明转化率随氧浓度和气体流量的增加而增加,而主产物的产率并不随氧气浓度同向变化,其中在31.0%O2氧浓度和37.5 mL/min气体流量下可获得较为理想的产率和转化率.反应体系中无有机溶剂参与,后续分离操作简便,同时避免了溶剂气味对产物香气的污染,反应体系对环境友好.     

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.     

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.     

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     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

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