烯

Alkylation of isobutane with butene is an effective method to producehigh-octane gasoline.

异丁烷与丁烯烷基化是生产高辛烷值汽油的有效方法。

Secondly, based on the phase behaviors, a new method for partition of supercritical reaction regions is used to study benzene-propylene alkylation under near critical conditions.

在相行为研究的基础上，使用对近临界点区域分区的方法进行丙烯与苯烷基化反应的研究。

The ligands were found to be effective in palladium-catalyzed asymmetric allylic alkylation to construct chiral quaternary carbon center.

这类配体在前手性亲核试剂的不对称烯丙基化构筑手性季碳中心的反应中，显示了较好的反应活性及对映选择性。

The alkylation of benzene with long-chain olefins has been performed in the presence of ionic liquid, the reaction conditions are optimized.

研究了离子液体催化苯与烯烃的烷基化，考察了反应条件对烷基化反应的影响。

Deactivation and regeneration of QZ-2000 catalyst for alkylation of benzene and propylene to synthesize cumene were studied.

对苯和丙烯烷基化反应合成异丙苯的QZ-2000烷基化失活催化剂进行了失活原因及再生条件的研究。

Among them,the main type of the constituents is alkylene, which amount to about 71% in Changium smyrnioides, and about 60% in Chuanminshen violaceum and Glehnia littoralis .

从三种植物中鉴定出21种挥发性成分，其中烯类精油是挥发油的主要成分，在明党参中约占71%左右，川明参及珊瑚菜中则约为60%左右。

The melt extrusion mixtures do not include certain additives such as polyoxy- alkylene compounds, alkylmonoethonolamide compounds, alkyldiethanolamine compounds and polyetheramide compounds.

熔体挤出混合物不包括某些添加剂如聚氧化烯化合物、烷基单乙醇酰胺化合物、烷基二乙醇胺化合物和聚醚酰胺化合物。

A process for preparing alkylene glycols including reacting an alkylene oxide with water in the presence of a combination of additives and an anion exchange resin, wherein the combination of additives comprises carbon dioxide and an organic or inorganic base provided in an amount sufficient to maintain a pH of the reaction mixture between about 5.0 and 9.0, with the proviso that, when the base is bicarbonate or carbonate, then the anion exchange resin is a trimethyl benzyl ammonium anion exchange resin.

制备亚烷基二醇的方法，包括让烯化氧与水在添加剂组合和阴离子交换树脂存在下进行反应，其中添加剂组合包括二氧化碳和以足以保持反应混合物的pH值在约5.0和9.0之间的量提供的有机或无机碱，前提条件是当碱是碳酸氢盐或碳酸盐时，阴离子交换树脂是三甲基苄基铵阴离子交换树脂。

The nucleophiles include alkene , alkyne, alcohol, acid, amine, water, etc.

亲核试剂包括烯烃、炔烃、醇、酸、胺、水等。

The recent development about applications of ionic liquids to transition metal -catalyzed cyclization of alkyne and enyne compounds was introduced.

概述了离子液体在过渡金属催化炔及烯炔类化合物环合反应中应用研究进展。

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。