查询词典 alkenes

The elaboration of systems that are able to mimic those enzymes should provide very important tools for three main purposes:(1) the development of new catalysts for important reactions in industrial and fine chemistry, such as the selective oxidation of alkanes and the stereoselective epoxidation of alkenes;(2) the prediction of the oxidative metabolism of new biologically active molecules such as drugs.(3) mimetic peroxidase of high catalytical activity and selectively is very important in bio-analytical field.

建立一系列关于这些酶的模拟体系将为以下三个方面的研究工作提供非常重要的工具：（1）工业或者精细化工方面重要反应新型催化剂的开发，例如烷烃的选择性氧化以及具有立体选择性的烯烃环氧化；（2）新的生物活性物质，例如药物的氧化机理的研究和预测；（3）具有合适底物的高活性过氧化物酶模拟酶在生化分析领域的前景。

In this catalyst system, the Knoevenagel condensations of a series of aromatic aldehydes with malononitrile or ethyl cyanoacetate were programmed and a mechanism was postulated as well. When aromatic aldehydes reacted with ethyl cyanoacetate, the corresponding alkenes proved to be E-isomers by 1H NMR.

在该反应体系中考察了一系列芳香醛和丙二氰、氰基乙酸乙酯的缩合反应，并推测了Knoevenagel缩合反应的机理，芳香醛与氰基乙酸乙酯缩合产物经1H NMR检测为E式烯烃。

Ti-MWW is more attractive by a comparison with those conventional titanosilicates (TS-1,Ti-MCM-41,et al ) in the epoxidation of linear functionalized alkenes, on which the epoxidation of allyl alcohol to glycidol is one of the most industrial promising processes for benign reaction conditions, high yields of the product and environment friendly.

Ti-MWW 对线性官能烯烃的环氧化具有优良的催化性能，特别是对烯丙醇环氧化制缩水甘油的过程，其反应条件温和，产率高，且对环境友好而最具有工业应用前景。

Oxidation of alkenes catalyzed by metalloporphyrin imidazolium salts in the presence of N-hydroxyphthalimide and isobutyraldehyde as co-catalysts provided the epoxidation product at room temperature. And the solvent with a weak coordinating ability such as acetonitrile gave the best result.

金属紫质咪唑盐於烯类的氧化催化反应上，若与NHPI及异丁醛共催化，可在室温进行环氧化反应，反应溶剂选择具有弱配位能力的乙腈，则可获得较佳结果。

THE ADDITION REACTION OF ALKENES AND DIETHYL MALONATE

烯类与丙二酸二乙酯的加成反应

The free-radical addition reaction of malonic ester with a series of alkenes under the uniform conditions has been studied.

在相同反应条件下，进行一系列烯烃与丙二酸二乙酯的加成反应，求得产率与烯烃结构间的定量关系，即反S型曲线。

Samples were subjected to high pressure ranging from 100 to 500 MPa. After high pressure treatments, the flavour compounds were extracted by Solid-Phase Microextraction. Analysis was carried out by Gas Chromatography-Mass Spectrometry. The key flavour compounds of orange juice were three alkenes (namely limonene, myrcene and α-pinene), two alcohols (linalool and α-terpineol), three aldehydes, one ketone and two esters (ethyl butyrate and 3-OH-ethyl hexanoate).

采用固相微萃取（Solid Phase Microextraction，SPME）方法对不同压力（100～500 MPa）超高压处理的鲜榨橙汁中的香气成分进行富集，并经气相色谱-质谱联用仪（Gas Chromatography-Mass Spectrometry，GC-MS）检测分析，橙汁中的主要香气成分有：3种烯（柠檬烯、月桂烯、α-蒎烯）；2种醇；3种醛；1种酮；2种酯（丁酸乙酯、3-OH-己酸乙酯），它们是构成橙汁的主要特征致香成分。

Even carbon number alkenes, phthalic esters and nitrogen heteroatom-containing components were detected in the elution fractions, while such components were not detected without silica gel column separation, indicating that preseparation is very important for increasing the sensitivity of GC/MS analysis.

各洗脱馏分用GC/MS分析，其可测成分与直接检测相比，多检测出偶碳烯烃、邻苯二甲酸酯类和含氮化合物等，表明合适的预分离对提高GC/MS分析的灵敏度非常重要。

The pyridinium salts was transformed by the base to 1-hydroxy or 3-hydroxy-quinolizinylides, which undergo 1,3-dipolar cycloadditionreaction with alkenes,and then aromatizated to cycl[3,3,2]azinone in thepresence of oxidant.

实验证明，这是一个连续进行的多步反应：2-羰基吡啶鎓盐在反应中先生成1-羟基或3-羟基喹嗪叶立德，然后与烯烃起1，3—偶极加成反应，最后在氧化剂作用下脱氢芳构化而生成Cycl[3，3，2]azinone。

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We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。