甲基溴

Whenpyridine was used as reductive decomposing agent, the expecting cholest-4-en-3,6-dione-22-al was obtained. However, when Zn/HOAc was used to decomposethe ozonide, C-4,5 double bond was further reduced to give cholest-3,6-dione-22-al as main product. 2 For the side-chain construction of compound (1), the solid-liquid phase-transfer Wittig reaction was used. When (3-methyl-2-oxobutyl)-triphenylarsonium bromide was used as reagent, the reaction can be carried out inmild reaction condition and the yield is higher than that when phosphorane wasused.

但使用Zn／HOAc作为分解剂时，却得到其氢化产物胆甾-3， 6-二酮-22-醛；2在甾体支链引入过程中，采用固-液相转移Wittig反应的方法，用(3-甲基)-2-氧丁基三苯基溴化胂作为试剂，反应在非常温和的条件下便可完成，而且产率比传统采用膦烷的方法更高；3在对某些甾酮化合物的选择性还原反应研究时，发现在〓还原体系中，当加入某些金属离子后，反应有更好的区域选择性和立体选择性。

The bactericidal performance of Tetrakis Hydroxymethyl Phosphonium Sulfate, 2-Bromo-2-nitro-1.3-Propanediol and formalin was studied in a carrier quantitative germicidal test.

通过载体定量试验对四羟甲基硫酸磷、溴硝醇和甲醛溶液的杀菌效果进行测定。

Based on this,a sensitive method has been developed for the quantitative determination of piperine in Mn-piperine-cetyltrimethylammonium bromide ternary system.

据此建立了在锰-胡椒碱-溴化十六烷基三甲基胺三元体系中测定胡椒碱的荧光分析新方法。

The effects of different PTC,reacting time,temperature,the concentration of potassium hydroxide and the bromoethane amout on the reaction were studied.

考察了不同相转移催化剂、反应时间、反应温度、氢氧化钾浓度、溴乙烷用量诸因素对2－甲基吲哚进行N－烷基化反应的影响。

As a precursive work of polymerization directly from vesicles, a polymerizable surfactant, allyl dodecyl dimethylammonium bromide was synthesized, and spontaneous stable vesicles were formed from aqueous solutions of ADDB and sodium dodecyl sulfonate in equimolar composition.

作为可聚合囊泡制备的前期基础工作，研究了一种可聚合的囊泡体系：1-丙烯基－2，2，二甲基－十二烷基溴化胺和ADDB与十二烷基磺酸钠的等摩尔比混合体系。

The inhibiting efficiency of bromo-hexadecyl pyridine and 3-methyl pyridine is higher than that of the others.

其中溴化十六烷基吡啶和3-甲基吡啶的缓蚀性能较好。

A spec-trophotometric method of the determination of trace tin was developed based on the reaction of tin with Pyrocatechol Violet in the presence of Cety Trimethylammonium Bromide in high alloy steel.

通过对干扰离子的影响及其消除方法的研究，提出了适用于高合金钢中的以邻苯二酚紫-溴化十六烷基三甲基胺光度法测定微量锡的分析方法。

In order to obtained the six-membered ring compound and a thorough assignment of the spectra, and further to prove that the six-membered ring compound was formed from the hydrogen transfer, the compound N-butyl-4-(N-methylphenylamino)-5-amino- 1, 8-naphthalimide 6 was designed to obtained with N-butyl-4-bromo-5-amino-1, 8-naphthalimide and N-methyl phenylamine as the starting material. However it was difficult to obtain the desired product as the different solvent giving the different products except the desired product.

为了能够得到六元环化合物作为定标的物质及其确切的谱图分析结果，并且为了进一步证明由五元环产物通过氢转移得到六元环产物的正确性，设计用N-丁基4-溴-5-氨基-1，8-萘酰亚胺与N-甲基苯胺反应生成N-丁基-4--5-氨基-1，8-萘酰亚胺6，结果发现这种方法很难实现，选择不同的溶剂会生成不同的产物，却都不是目标产物。

The method was used to examine the interaction process of cetyltrimethyl ammonium bromide and sodium dodecyl sulfate with lysozyme in aqueous solution.

提出了用串联式压电石英晶体传感技术研究离子型表面活性剂与蛋白质之间相互作用过程的新方法，并用这种新方法研究了溴化十六烷基三甲基铵和十二烷基磺酸钠与溶菌酶在水溶液中的相互作用过程。

The critical crossover behavior in the ternary electrolyte solutions of water＋3-methylpyridine＋sodium bromide is a matter of debate.

对水＋3-甲基吡啶＋溴化钠三元电解质溶液的临界跨接行为的认识存在着争议。

I will endeavour to find you some assistance.

我尽力帮你找人帮忙。

At first I only know bruck is the idol of American younglings, afterwards I returned back to Taiwan ,even in Beijing last year ,I saw her poster everywhere, I was so surprised at her charm.

起初我只晓得布鲁克雷德丝是美国少男少女崇拜的偶像，后来回台湾，甚至去年在北京，居然也四处看见她的海报，才惊讶她的魅力之大。