甲基溴

The reaction of methyl bromide with methylamine to give dimethylammonium bromide is a typical SN2 reaction that shows second-order kinetics.

答：甲基溴与甲胺反应得到二甲基溴胺是一个典型的SN2反应，是动力学二级反应。

In the process of laboratory study, oxycodone was prepared by oxidating thebaine at 6,14-position under oxydol, hydrodeoxidizing 7,8-position double bond and 14-position ether under palladium catalyst. Furthermore, N-methyl of oxycodone was isolated byα-chloro-ethyl chloroformate under anhydrous condition and protection of 14-position hydroxyl to obtain noroxycodone, which was further converted into methylnaltrexone by N-alkylation in presence of cyclopropyl bromomethane, then by isolating 3-position methyl of methylnaltrexone under boron tribromide, becoming hydrochloride to prepare target compound, natrexone hydrochloride.

实验室工艺方面，本文首先用双氧水氧化蒂巴因的6-位和14-位、在钯炭催化下加氢还原7-8位双键和14-位醚合成羟考酮，然后提出并优化了在无水和14-位保护的情况下，用氯甲酸-α-氯乙酯脱去羟考酮的N-位甲基合成去甲羟考酮，再用环丙甲基溴将去甲羟考酮的N-位烷基化合成甲基纳曲酮，最后采用三溴化硼脱去甲基纳曲酮的3-位甲基和成盐酸盐合成盐酸纳曲酮。

This paper is studied on a new synthesis method of amino-modified organic silicone micro-emulsion of cationic style by one step with a silane-alkyl coupling,3-(2-aminoethyl)-aminopropyl methyl dimethoxy silane while opening-cyclo polymerization of the octa-methyl cyclo tetra siloxane,thus the optimal manufacturing conditions are determined by comparing test of their properties.

采用硅烷偶联剂氨乙基氨丙基甲基二甲氧基硅烷改性，八甲基环四硅氧烷开环聚合，探索一步合成阳离子型氨基改性有机硅微乳新方法，通过其性能测试得出其最佳工艺条件：反应温度：80℃，反应时间：3 h，十六烷基三甲基溴化铵用量：5%，脂肪醇聚氧乙烯醚用量：5%，预乳液滴加时间：2 h。

Professional sales companies operating bromide products: sodium bromide, sodium bromide, potassium bromide, potassium bromate, Tetrabromobisphenol A, Deca-BDE, ten PBDEs, DBDPE, hexabromodiphenyl Central dodecane, dibromo neopentyl glycol, neopentyl bromide three alcohols, three bromine phenol, octabromodiphenyl ether, brominated polystyrene, bromide, calcium bromide, dibromo succinic acid, dibromo-D ene glycol, bromide surfactants series: Dodecyl trimethyl ammonium bromide, tetradecyl trimethyl ammonium bromide, cetyltrimethyl ammonium bromide, octadecyl trimethyl ammonium bromide dodecyl trimethyl ammonium chloride, tetradecyl trimethyl ammonium chloride, cetyl trimethyl ammonium chloride, octadecyl trimethyl ammonium chloride, tetrabutyl ammonium bromide wholesale sales: dimethylolpropionic acid, DL-malic acid, isophthalic acid PIA, glycolic acid, adipic acid.

公司专业经营销售溴化物系列产品：溴化钠、溴酸钠、溴化钾、溴酸钾、四溴双酚A、十溴二苯醚、十溴联苯醚、十溴二苯乙烷、六溴环十二烷、二溴新戊二醇、三溴新戊醇、三溴苯酚、八溴醚、溴化聚苯乙烯、溴化铵、溴化钙、二溴丁二酸、二溴丁烯二醇、溴化表面活性剂系列：十二烷基三甲基溴化铵、十四烷基三甲基溴化铵、十六烷基三甲基溴化铵、十八烷基三甲基溴化铵、十二烷基三甲基氯化铵、十四烷基三甲基氯化铵、十六烷基三甲基氯化铵、十八烷基三甲基氯化铵、四丁基溴化铵批发销售：二羟甲基丙酸、DL-苹果酸、间苯二甲酸 PIA、羟基乙酸、己二酸。

Different cation asphalt emulsion was prepared taking cetyl trimethylammonium bromide,cetyl trimethylammonium chloride and stearyl trimethylammonium chloride as emulsifier.

以十六烷基三甲基溴化铵、十六烷基三甲基氯化铵及十八烷基三甲基氯化铵为乳化剂制备了不同的阳离子乳化沥青，按ASTMD244的方法获取乳化沥青蒸发残留物，测试乳化沥青蒸发残留物的针入度和其中3种乳化沥青蒸发残留物在不同温度下的黏度，并获得相关黏温性。

Three cationic surfactants, N -dodecyl- N -(2-hydroxyethyl)- N , N -dimethylammonium bromide, N -tetradecyl- N -(2-hydroxyethyl)- N , N -dimethylammonium bromide and N -cetyl- N -(2-hydroxyethyl)- N , N - dimethylammonium bromide have been synthesized.

合成了 N -十二烷基- N -(2-羟乙基)- N ， N -二甲基溴化铵、 N -十四烷基- N -(2-羟乙基)- N ， N -二甲基溴化铵和 N -十六烷基- N -(2-羟乙基)- N ， N -二甲基溴化铵等3个季铵盐阳离子表面活性剂。

Also, the type of dispersion of four gasliquid-liquid systems: air-decane-aqueous solution of sodium sulfite and surfactant, airmixture of decane and dodecene-aqueous solution of rhodium complex, ligand, and surfactant, air-mixture of decane, dodecene and tridecyl aldehyde-aqueous solution of rhodium complex, ligand and surfactant, and air-mixture of decane and dodeceneaqueous solution of trisodium salt of tri (m-sulfophenyl) phosphine, and surfactant is determined by electric conductivity.

本文采用电导率测量的方法实验研究了空气—正癸烷—亚硫酸钠和十六烷基三甲基溴化铵水溶液、空气—正癸烷和1-十二碳烯混合物—铑膦络合物催化剂和十六烷基三甲基溴化铵水溶液、空气—正癸烷、1-十二碳烯和十三醛混合物—铑膦络合物催化剂和十六烷基三甲基溴化铵水溶液、空气—正癸烷和1-十二碳烯混合物—三间磺化苯基膦三钠盐和十六烷基三甲基溴化铵水溶液四个三相体系的液液分散特性。当有机相与水相体积比分别为7／3、1／1和3／7时，前三个体系均形成水包油型分散，并有稳定的乳状液生成。

Respectively proceeding with bromine complexing agent of anode, modified membrane and electrolytic additive of cathode, mainly referring to specific power of battery, ratio of self-discharge and zinc dendrite, this paper has studied the influences of different anode additive and modified membrane on specific energy of battery by means of charge and discharge curves, and the influences of electrolytic additive(NH4+, OP-10, TX-10 and dodecyl trimethyl ammonium bromide) on zinc dendrite by means of current-time curve and microscopic morphology observation.

本文分别从正极溴络合剂、隔膜改性和负极的电解液添加剂入手，以电池的比能量、自放电率以及锌枝晶生长情况为主要的性能指标，用电池充放电曲线等方法研究不同正极添加剂和隔膜改性对电池比能量的影响；用电流-时间曲线以及微观形貌观察等方法研究电解液添加剂(NH_4~+、OP-10、TX-10以及十二烷基三甲基溴化铵)对锌枝晶生长的影响。

At the 1995 meeting on the protocol, representatives agreed to phase out the use of methyl bromide in industrialized nations entirely by 2012, and to gradually phase out its use during the 15 years prior to that deadline.

在1995年的关于议定书的会议上，代表们也同意应该在工业国家逐步减少对甲基溴化物的使用，直到2012年完全停止使用，应从1997年开始实现甲基溴化物使用量的下降。

No single substance can completely replace methyl bromide at present. The current situation and application of alternatives in abroad and domestic were summarized.

由于用于土壤消毒的甲基溴会有30％～85％的总用量进入大气，而甲基溴又是一种消耗臭氧层物质，因此在1992年哥本哈根会议上，甲基溴被列为受控制物质。

I am accused of being overreligious," she said in her quiet, frank manner,"but that does not prevent me thinking the children very cruel who obstinately commit such suicide.""

客人们在卡罗利娜·埃凯家里，举止就文雅一些，因为卡罗利娜的母亲治家很严厉。

Designed by French fashion house Herm è s, this elegant uniform was manufactured in our home, Hong Kong, and was the first without a hat.

由著名品牌 Herm è s 设计，这件高贵的制服是香港本土制造，是我们第一套不配帽子的制服。