两性离子

The reaction process in methanol solvent can be deduced from the computational results with CPCM solvent model and the supermolecular handling, namely the reaction involves four steps in the methanol solvent. The nucleophilic addition of trimethylamine to acraldehyde generates an enolate. Nucleophilic attack of the enolate on the aldehyde forms the carbon-carbon bond, followed by the proton-transfer process and the further elimination generating the product and liberating the trimethylamine catalyst.

对于CH3OH对反应体系的影响，可以综合考虑CPCM溶剂模型及超分子模型下的研究结果，即CH3OH溶剂中反应按四步进行，催化剂三甲胺首先与丙烯醛发生亲核加成，生成的两性离子中间体与甲醛发生类似于Aldol的醛醇缩合，形成碳-碳键，之后发生分子内质子转移，最后经E1cb消除得到产物，并释放催化剂三甲胺。

To solve the problem of scaling and corrosion of oil wells , HS-1 corrosion inhibitor was developed by synthesizing organic acid, organic amine and corresponding auxiliary materials.

为解决油井由于腐蚀结垢严重影响油田正常生产问题，采用有机酸和有机胺及助剂合成了HS-1油井缓蚀剂，同时与阴离子及两性离子表面活性剂等多种助剂复配，研制出了HZ系列缓蚀阻垢剂。

On the base of molecular structure design, the mechanism and technique of the synthesis of 2-(acryloyloxy ethyl trimethyl-ammonium chloride/2-acrylamido-2methylpropane sulfonic acid/acrylamide (AETMAC/AMPS/AM) amphoteric terpolymers by radical co-polymerization in aqueous solution was studied systematically.

依据分子结构设计理论，将2—丙烯酰氧乙基—三甲基氯化铵/2—丙烯酰胺基—2—甲基丙烷磺酸/丙烯酰胺(AETMAC/AMPS/AM)三种单体进行水溶液自由基共聚，合成了AP系列两性离子聚合物。

In the meantime, we proposed a mechanism for this catalytic reaction. According to the possible formation of intermediate B, we designed a disubstituted ketene of more function to re-capture the zwitterion.

在同位素标记基础上，我们推测了这个N-甲基咪唑催化的二组分反应可能的机理，并根据此机理设计用一个二取代的烯酮来捕捉N-甲基咪唑和DMAD形成的两性离子。

The zwitterion derived from the addition of N-methylimidazole to DMAD was investigated and intercepted by a ketene.

我们用烯酮来捕捉N-甲基咪唑与活泼炔DMAD形成的两性离子。

A novel zwitterion derived from the addition of thiazole carbene to ketene was discovered and captured by an activated alkyne. In this process, we developed a facile and efficient three-component tandem reaction involving thiazole or benzothiazole carbene, disubstituted ketene and activated alkyne.

我们发现了一种新的噻唑卡宾和烯酮形成的两性离子的存在，并用活泼炔成功捕捉，从而发展了一个新的噻唑卡宾或苯并噻唑卡宾、二取代烯酮和活泼炔的三组分串联反应。

This shows, zwitterion divides powder to have good applied value.

由此可见，两性离子分散剂具有良好的应用价值。

FT-IR results show that in the strongly acidic、weakly acidic and basic solutions, the glycine exists in the form of cation、zwitterion and anion, respectively.

在强酸性、弱酸性和碱性溶液中，吸附态的甘氨酸分别主要以阳离子、两性离子和阴离子形式存在。

Experiments are conducted on the effect of different types and different molecular structures of polymers on HPAM removal existed in solution or sewage. It is found out that only cationic polymer has a better removal effect of HPAM among the non-ion, amphoteric ion and hydrophobical cation polymers, especially the DMDAAC cationic polymer has an optimal result. The removal capacity to HPAM can be further improved by using appropriate molecular weight and cationic capacity and gas floatation technique.

试验研究了不同类别及分子结构的聚合物对溶液或污水中HPAM的去除效果，发现非离子、两性离子、疏水改性阳离子聚合物对HPAM无去除作用，只有阳离子聚合物去除效果较好，其中尤以DMDAAC系列阳离子聚合物效果最优，而适当的分子量和阳离子化度以及气浮技术均可以进一步提高其对HPAM的去除率。

General meanings, feather and behavior of surfactant, Chemical structure, characteristic and synthesis of anionic, cationic, non-ionic and zwitterionic surfactants, Extraordinary properties and their correlative effecting factors.

阳离子、非离子和两性离子表面活性剂的化学结构、特点和合成方法；同时对表面活性剂的性质及相关因素作一大致的阐述。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。