烯烃

The vast majority of these polymers after combustion split into fluorinated alkene, while the fluorinated alkene is that it may cause cancer substances.

指出，这些聚合物燃烧后绝大部份分裂为氟化烯，while的含氟烯烃认为它可能是导致癌症的物质。

The chlorination in allylic position of olefins is an important transformation in organic synthesis.

二。烯烃的烯丙位氯化是制备化学中间体的一个重要反应。

It also include parts of alterability, con-mix, enhancement and compound, however, it is one of the perfect antiseptic materials at present.

PO是以乙烯，丙烯等烯烃为主的均聚物和共聚物，也包括部分改性，共混，增强，复合物，是目前最理想的防腐材料之一。

Table 2 shows names for some alkyl groups, alkanes, alkenes and alkynes.

表2显示了一些烷基、烷烃、烯烃及炔烃的命名。

We are interesting in the synthesis and the application of 1,2,3-triazoles inthis paper, which including the following:In the first chapter, we reviewed mainly the development of Huisgen\'s 1,3-dipolar[3+2]-cycloaddition from organoazides and alkynes or alkenes to synthize1,2,3-triazoles in recent years.

本论文针对1，2，3-三唑的合成和应用，主要包括以下方面：第一章对近几年来1，2，3-三唑合成研究进行了概述，总结了有机叠氮和炔烃、烯烃的1，3-偶极环加成反应以及其他方法合成三唑的进展。

The more the types of unstable constituents,such as unsaturated hydrocarbons,especially conjugated dienes,arene s and so on,and the higher the unstable constituent contents in diesel fuel,the more easily the oxygen absorption reaction takes place.

柴油中含有某些不饱和烃，特别是共轭二烯烃、环烷、芳香烃类等不安定组分的种类越多及含量越高，就越容易发生吸氧氧化反应，安定性能或质量下降越明显。

In the fifth part, asymmetric synthesis of β,γ-trans-alkenyl α-amino esters was achieved by chiral phosphoric acid catalyzed transfer hydrogenation of β,γ-alkynyl α-imino esters. Utilizing Hantzsch ester as the hydrogen donor, both the alkyne and imine moieties of β,γ-alkynyl α-imino esters were reduced to yield β,γ-trans-alkenyl α-amino esters with up to 96% ee.

第五部分工作中，使用手性磷酸作为催化剂，Hantzsch酯作为氢源，β，γ-炔烃取代的α-酮酸酯亚胺中的炔键和亚胺官能团均被还原，以中等的收率和优秀的对映选择性（up to 96% ee）得到β，γ-反式烯烃取代的α-氨基酸衍生物。

Isomerized gasoline is the cleanest high-octane gasoline component, which is free of sulfur, olefin and aromatics.

异构化汽油不含硫、烯烃及芳烃，是最洁净的高辛烷值汽油组份。

However, in some circumstances, such selective hydrogenation catalysts can produce green oil by oligomerizing the acetylenes and diolefins.

然而，在某些情况下，这种选择性加氢催化剂可通过使炔烃和二烯烃低聚而产生绿油。

On the other hand, steam can be used to restrain the side reaction such as hydrogen transfer reaction so as to increase the yield of light olefins by diluting the concentration of the reactant. In addition, minor steam can react with the feed hydrocarbon resulting in the decrease of coke and the formation of active hydrogen without the increase of hydrogen gas and light saturates that is not desirable.

另一方面，水蒸气不仅仅具有降低烃分压的作用，抑制了氢转移反应等副反应，对于低碳烯烃的产率有好的影响，而且在反应过程中，少量参与了反应，与烃类发生了水煤气反应，生成了活泼氢，不仅降低了焦碳的产率，并且没有提高氢气、低碳烷烃等不希望得到的产物。

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。