环铵

Piperidine oxoammonium salts oxidize aromatic amines and N, S-containing heterocycles to the corresponding radical cations, and the isotope effects in electron transfer reactions between thianthrene and N-methylphenothiazine radical cations and their respective neutral parent molecules have been reported for the first time.

啶氧铵盐氧化芳95胺和含氮、硫芳杂环为相应的自由基正离子，首次报道了及甲基吩自由基正离子与其中性母体之间电子转移的同位素效应。

Piperidine oxoammonium salts oxidize aromatic amines and N, S-containing heterocycles to the corresponding radical cations, and the isotope effects in electron transfer reactions between thianthrene and N-methylphenothiazine radical cations and their respective neutral parent molecules have been reported for the first time.

哌啶氧铵盐氧化芳香胺和含氮、硫芳杂环为相应的自由基正离子，首次报道了噻蒽及甲基吩噻嗪自由基正离子与其中性母体之间电子转移的同位素效应。

The optimum conditions of preparing quaternary ammonium salt of chitosan were determined as follows: the molar ratio of chitosan to glycidyl trimethyl ammonium chloride 1:3, reaction temperature 80℃and reaction time 10 h.

制备壳聚糖季铵盐的最佳反应条件为：壳(来源：A4040BC论文网www.abclunwen.com)聚糖与环氧丙基三甲基氯化铵的摩尔比为1：3、反应温度是80℃、反应时间为10小时。

To study the relationship between the "tail" structure and the characteristics of Gemini surfactants, a new gemini surfactant CH(subscript 2s)-αω-Bis (dehydroabietyihydroxypropyltetramethylethyldiammonium Chloride) here s=2, has been synthesized. Dehydrogenated rosin as hydrophobic "tails" in the structure. The affections of reacttants ratio, reaction temperature and time on the yield of aimed compound have been discussed.

研究了Gemini表面活性剂中疏水&尾巴&结构对性质的影响，以脱氢松香酸和环氧氯丙烷为原料合成了中间体3-脱氢松香酰氧－2-羟丙基氯，再与四甲基乙二胺反应，得到1种以脱氢松香酰基为疏水链&尾巴&的对称Gemini型双季铵盐阳离子表面活性剂：二氯化－N，N'-二（3-脱氢松香酰氧－2-羟丙基）四甲基乙二胺。

To study the relationship between the hydrophobic "tail" structure and thecharacterizations of Gemini surfactants, a new gemini surfactant CsH2s-α,ω-bis(dehydroabietylhydroxypropylteteramethylethylammonium Chloride),here s=2, wassynthesized. Dehydrogenated rosin as hydrophobic "tails" in the structure. The impact factorsin the two steps are discussed.

为研究gemini表面活性剂中疏水&尾巴&结构对性质的影响，本论文以脱氢松香酸和环氧氯丙烷为原料合成了中间体3-脱氢松香酰氧-2-羟丙基氯，再与四甲基乙二胺反应，得到一种以脱氢松香酰基为疏水链&尾巴&的对称gemini型双季铵盐阳离子表面活性剂：二氯化-N，N′-二(3-脱氢松香酰氧-2-羟丙基)四甲基乙二胺。

Next, the oxidative refolding of denatured-reduced Lysozyme in presence of cetyltrimerthyl ammonium bromide and β-cyclodextrin were investigated.

接着研究了去污剂十六烷基三甲基溴化铵和β-环糊精的人工分子伴侣体系对变性-还原溶菌酶的氧化复性效果。

How big a macrocycle should be for threading to occur is a basic and important question in threaded structure chemistry.

在互穿结构化学中，客体二级铵盐究竟最小能穿过多大的冠醚环的空腔形成互穿结构是一个基本但非常重要的问题。

The epoxidation of α-pinene and β-pinene by 50% hydrogen peroxide and a small amount of sodium tungstate, in the presence of quaternary ammonium salt A-1 as a phase transfer catalyst, is carried out.

摘 要：采用季铵盐A-1作相转移催化剂，质量分数为50%的H2O2作氧化剂，三氯甲烷作溶剂，在加入少量钨酸钠的条件下，实现了α-蒎烯和β-蒎烯的环氧化反应。

Quaternary ammonium compound category, ethylene oxide, composite aldehydes, chelating agent, surfactant, the activity factor.

复合季铵盐类、环氧乙烷、复合醛类、螯合剂、表面活性剂、活性因子。

Category quaternary ammonium compound, ethylene oxide, composite aldehydes, chelating agent, surfactant, the activity factor.

复合季铵盐类、环氧乙烷、复合醛类、螯合剂、表面活性剂、活性因子。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。