查询词典 addition reaction

Type shown above, the lower temperature as allyl methyl carbocations (1) is greater than the stability of carbocations (2), so the potential energy diagram in the reaction pathway for the carbon embodied in the positive ion hybrid resonance body and Chloride Cl-if by 1,4 - addition will have to experience higher ...

如上式所示，较低温度下由于烯丙基甲基碳正离子(1)的稳定性大于碳正离子(2)，所以在反应历程势能图中体现为碳正离子共振杂化体与氯离子Cl-若按1，4-加成则要经历较高。。。

The assay, which was based on primers and TaqMan-MGB probes selected from highly conserved regions of the hemagglutinin gene of avain influenza virus subtype H5, was optimized in a reaction system and a condition to improve the sensitivity, specificity and accuracy. In addition, colone technology was used to develop a quantitative PCR format with virus copies amount.

针对H5亚型禽流感病毒血凝素基因保守区域设计特异性引物与TaqMan-MGB荧光探针，筛选并优化荧光定量RT-PCR反应体系与反应条件，用以提高方法的特异性、敏感性与准确性；并通过体外克隆技术建立病毒基因拷贝数进行定量分析。

The reaction is most likely initiated by electrophilic addition of NO to the C-C double bond specifically at the a-position.

反应可能是由少量NO_2对C=C的加成引发的，推测反应过程中在羰基β位形成了以碳为中心的自由基中间体。

The reaction is assumed to be most likely initiated by an electrophilic addition of NO〓 to the carbon atom of carbon-nitrogen double bonds.

二者的不同之处在于：酮腙C=N双键上不存在H，可通过消去NH上的质子，生成硝基偶氮化合物。

When the reaction was finished, the ligand was extracted with CH2Cl2 and precipitated upon addition of diethyl ether followed by filtration.

2配体2在丙酮/水体系中催化/又种烯烃的AD反应，非链端烯烃的立体选择性(80一99%ee)明显优于链端烯烃(51一62%ee)。

In addition, it was found that DAP polymerization is prone to self -stagnate as well as cross-link and the result of this competition depends on the reaction temperature.

研究还发现DAP聚合存在着自阻聚和交联两种反应趋势的竞争，而反应温度对竞争结果有直接影响。

Chiral amine-protonic acids are highly efficient and excellent enantioselective organocatalysts developed in recent years. They have been successfully applied to a number of enantioselective organic reactions, such as asymmetric aldol condenstion, Michael addition, Diels-Alder cycloaddition, Strecker reaction and so on.

手性胺-质子酸是近年来发展起来的新型高效、高对映选择性的有机催化体系，已成功应用于催化不对称Aldol反应、Michael加成反应、Diels-Alder反应和Strecker反应等许多重要的有机合成反应。

Objective To investigate the effects of interleukin-1 β converting enzyme gene on the biologic characteristics of ovarian cancer cells.

目的 探讨白细胞介素-1 β转换酶的表达，对卵巢癌细胞生物学特性的影响。

Campylobacter: This illness is the most commonly identified cause of diarrheal illness in the world.

弯曲：这种病是最常见的原因查明腹泻病，在世界上。