查询词典 dienes

We have studied the transition metal complexes catalyzed sequential cross coupling reactions of these new difunctional group reagents with electrophiles and nucleophiles, respectively; developed some convenient and practical new methods for the stereoselective synthesis of disubstituted alkenes, trisubstituted alkenes, conjugated dienes containing heteroatom, conjugated enyne containing heteroatom etc., enriching methodologies for organic synthesis.

继而研究了这些新型双官能试剂在过渡金属配合物催化下分别与亲电试剂、亲核试剂的顺序交叉偶联反应，为双取代烯烃、三取代烯烃、杂原子取代的共轭二烯烃、杂原子取代的共轭烯炔烃等的立体选择合成提供了方便实用的新方法，丰富了烯烃立体选择合成的方法学。

Grasp the electron delocolization theory; be capable of judging the relative stability of allylic and benzylic free radicals and carbocations, know the relative stability of dienes and other multiple unsaturated hydrocarbons; grasp the characteristics for the nucleophilic substitution reactions of allyl halides and benzyl halides, and the addition reactions of conjugate dienes.

掌握电子非定域化理论；能够分析判断烯丙基、苄基自由基和正离子的稳定性和二烯及多重不饱和碳氢化合物的稳定性；掌握烯丙基、苄基卤代物的亲核取代反应特性和共轭二烯的加成反应。

The determination of conjugated dienes content in gasoline by polarographic method is studied.

研究了用极谱法测定汽油中的共轭二烯烃含量的方法。

Understand the chemistry of alkenes and alkynes: nomenclature, electronic structures, sequence rule, cis-trans isomers, electrophilic addition reactions and mechanism, Markonikov's rule, conjugated dienes, rules of resonance forms.

A2 E3 了解烯类及炔类的化学性质：命名、电子结构，顺反异构物，亲电子加成反应及机制，马克尼可夫规则，共轭双键及共振式。

The content of conjugated dienes in petroleum products is determined by ultraviolet spectrophotometry.

在化学反应－气相色谱法联合测定含烯汽油中共轭二烯烃质量分数的基础上，建立了用紫外分光光度法测定油品中的共轭二烯烃的含量。

The polymerization of conjugated dienes on a cationic exchange resin was investigated.

在一连续的固定床反应器中，采用强酸性阳离子交换树脂催化剂，研究了共轭二烯烃在醚化条件下的反应行为。

Compounds containing two double bonds are called dienes.

包含两个双键的化合物叫做二烯烃。

It is identified that the peak at -2.45V is styrene or naphthalene, and the peak at -2.80V is conjugated dienes.

分析表明-2.45V处的峰来自苯乙烯或萘，-2.80V处为共轭二烯烃的特征峰。

In this system, the lattic structure is different from Boolean algebra, the implication operator → is just the Kleene Dienes operator R KD .

研究赋值格为非线性序，其格结构不同于Boole代数，而蕴涵算子→取Kleen－Dienes算子RKD的一种新的6值逻辑系统K16的语义理论，得到若干结果

The results from analysis of conjugated dienes and thiobarbituric acid-reactive substance formation showed that aqueous extracts of black rice and black sesamin and ethanol extracts of black Jew's ear inhibited the oxidation of LDL.

我们发现，黑糯米和黑芝麻水萃取物及黑木耳的酒精萃取物会延迟脂质氧化过程的中间产物 conjugated dienes 的出现，且会抑制终产物 thiobarbituric acid-reactive substance 的产生，反映出黑糯米和黑芝麻水萃取物及黑木耳的酒精萃取物具有抗低密度脂蛋白氧化的能力。

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。