溴

Bromo-2-sulfolene (2) reacted with substituted benzoic acid salt s 3a～3c or alizarin yellow (3d) to give four novel allylic substitution products 4a～4d by esterification reaction, respectively.

以3，4-二溴环戊砜(1)为原料，在无水吡啶作用下发生消除反应，得到反应中间体4-溴-2-环戊烯砜(2)，再分别与一系列取代苯甲酸盐3a～3c以及茜素黄GG(3d)发生酯化反应，合成出4种新环戊烯砜衍生物4a～4d，并用IR，1HNMR，MS，元素分析等表征了它们的结构。

The experimental results indicate that:As an anode additive, tetraethyl ammonium bromide can perfectly complex with bromine.

实验结果表明：(1)四乙基溴化铵作为一种正极添加剂能很好地与溴络和。

The instrument can be used for the determination of total sulfur, total chrorine, trace water, bromine number and bromine index, mercaptan and hydrogen sulfide, chloride ion, salt content and chemical oxygen demand.

仪器可广泛用于各种样品中总硫、总氯、微量水分、溴价和溴指数、硫醇和硫化氢、氯离子和盐含量以及化学需氧量等的测定。

Methods IO(superscript - subscript 3) was prepared by quantitative oxidation of bromine water, with the excessive bromine removed with formic acid. In the presence of excessive iodide, I(superscript -) would be oxidized by I(superscript - subscript 3) to form 3 times of I(superscript - subscript 3) in mol, displaying maximal absorption at 286nm in ultraviolet zone and a slightly low apex at 345nm.ε286=1.3×10^5 Lmol^(-1)cm^(-1),ε345=8.1×10^4 Lmol^(-1)cm^(-1), with both showing high sensitivity.

利用溴水定量氧化I生成IO(上标-下标 3)，再用甲酸除去过量的溴，IO(上标-下标 3)在过量碘化物存在下氧化I产生3倍摩尔量的I(上标-下标 3)，在紫外光区的286nm具有最大吸收，并在345nm处另有一略低的吸收峰，ε286=1.3×10^5 Lmol^(-1)cm^(-1)，ε345=8.1×10^4 Lmol^(-1)cm^(-1)，均具有很高的灵敏度。

With 4 Xiu Shuang phenol - A and solid smooth air is raw material, dissolve it in 1 in, 2- 2 chlorine ethane solvents, slow drop adds 3 Yi Ans to carry out solution get together , with 3 Xiu benzene phenol does end dose, thick product sinks by industrial alcohol Xi after, take out to strain , wash is dry , grind white powder form flame retardant assemble carbon sour ester product.

以四溴双酚-A、固体光气为原料，将之溶解在1，2-二氯乙烷溶剂中，缓慢滴加三乙胺进行溶液聚合，以三溴苯酚做封端剂，粗产品经工业酒精沉析后，抽滤，洗涤，干燥，研磨得白色粉末状阻燃聚碳酸酯产品。

Ferric chloride catalyzed direct conversion of carbonyl compounds to the corresponding chloride with silicon hydride ( dichloromethylsilane , chlorodiphenylsilane or trichlorosilane) was realized.

在甲基二氯硅烷作用下，FeCl3能催化羰基化合物的还原氯代反应，得到相应的氯代产物；在甲基二氯硅烷、PBr3或NaI作用下，FeCl3可以催化羰基化合物的还原溴代或碘代反应，分别以良好的收率得到相应的溴代烷或碘代烷

RoHS Directive stipulates that from July 1, 2006, All member states should invest in the market to ensure that the restrictions on the use of electronic and electrical equipment, lead, mercury, cadmium, hexavalent chromium, polybrominated diphenyl ether and polybrominated biphenyls and other hazardous substances.

RoHS 指令规定，从2006年7月1日起，各成员国应确保在投放于市场的电子和电气设备中限制使用铅、汞、镉、六价铬、多溴二苯醚和多溴联苯等有害物质。

From July 1, 2006, the new electronic and electrical products into the EU market, lead, mercury, hexavalent chromium, polymerization bromide biphenyl or polymerization bromide diphenyl ether content must not exceed 0.1% of the weight of the components, the cadmium content of no more than 0.01% of the weight of the host material.

从2006年7月1日起，新投入欧盟市场的电子电器产品中铅、汞、六价铬、聚合溴化联苯或者聚合溴化联苯乙醚含量不得超过该元件的重量的0.1%，镉的含量不得超过所在材料重量的0.01%。

Not only lead, but cadium, mercury, hexavalent chromium, polybrominated biphenyl, and polybrominated diphenyl ether flame retardants are limited as well.

不仅带领，但是cadium、水银、六价的铬、多溴化的联苯和多溴化的二苯基以太火焰阻化剂被限制。

These directives limit the use of six hazardous materials in the manufacture of electronic and electrical equipment: lead, mercury, cadmium, hexavalent chromium (chromium VI or Cr6+), polybrominated biphenyls, and polybrominated diphenyl ether.

这些标准限制了6种有毒材料在电子电气设备生产中的应用：铅，汞，镉，六价铬(chromium VI 或 Cr6+)，多溴联苯，多溴联苯醚等。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。