乙烷

Highly toxi c solvents benzene,tetrachloromethane,methanol were replaced by toluene,1,2-di c hloroethane,ethanol in the course of reaction and purification.

甲基 2 ，1，3 苯并噻二唑的溴化改在低毒性的 1，2 二氯乙烷中进行，革除了高毒性的四氯化碳。

Trichloroethane, trichloroethylene or tetrachloromethane is prohibited using.

严禁使用三氯乙烷、三氯乙烯或四氯化碳！

ABSTRACT: This assay initially discussed the researches and developments of syntheses and reforming of the tetratlycidyletyer of tetraphenol ethane applying to the copper clad laminate and simply explained its principles and functions of UV-ray shield and fluorescence.

本文对四官能环氧树脂[1，1，2，2—四乙烷四缩水甘油醚]的合成与改性及在覆铜板中的应用作了初步探讨，并对其屏蔽紫外线与产生荧光的机理作用作粗浅的阐述。

In this study, new benzo[l,2,3]thiadiazole derivatives were designed according to relationship of structure and efficacy. The 9 novel compounds were synsthesized with following reactions. The chlorine atom in 2-chloro-3,5-dinitro-benzoic acid as beginning raw material was substituted by 2-methylpropane-2-thiol, esterified then with bromoethane, reduced by iron powder and cyclized to obtain ethyl benzo[l,2,3]thiadiazole-7 after diazonation reation.

本论文根据苯并噻二唑诱导剂的构效关系设计了新的苯并噻二唑的结构，并合成了9个未见文献报道的化合物，合成步骤如下：采用2-氯-3，5-二硝基苯甲酸为起始原料，苯环上的氯原子被叔丁基硫醇置换，羧酸由溴乙烷酯化，硝基由铁粉还原，随后经重氮化关环生成苯并[1，2，3]噻二唑-7-羧酸乙酯。

Hydroxy-N,N-bis(2-aminoethyl)ethylamine was synthesized by addition alkylation of diethyl triamine with epoxyethane for the first time.

以二乙烯三胺和环氧乙烷为原料，通过加成烷化反应一步合成标题化合物，经多种谱学手段表征确证。

Methyl-trichloro-silane; Trichloro- silane

甲基氯仿见1， 1， 1-三氯乙烷

Edgewax: Waxing method recommended for lubricating release prints; treatment is with a solution of 50 grams of paraffin wax per litre of trichloromethane applied only to the edges of the emulsion side of the film.

用封腊的方法来润滑用于发行的拷贝；这种方法是用每升三氯乙烷溶解50 克石蜡形成的溶液，只用于处理胶片的乳剂面的侧缘。

Edgewax: Waxing method recommended for lubricating release prints; treatment is with a solution of 50 grams of paraffin wax per litre of trichloromethane applied only to the edges of the emulsion side of the film.

片边腊润：用封腊的方法来润滑用于发行的拷贝；这种方法是用每升三氯乙烷溶解50克石蜡形成的溶液，只用于处理胶片的乳剂面的侧缘。

The thermal property studies indicate that the mass loss of compound B was 54.39% at 242.2~750℃, and when the temperature was 1000℃, there was 25.11% char residue left, which showed that the title compound has a good thermal stability and char forming capability. Using acetonitrile as the solvent instead of trichloromethane or 1, 2-dichloethane gave higher yield. During the synthesis, the yield was very low when triethylamine was used as acid acceptor alone, and when a little amount of 4-dimethylaminopyridine was added at the same time, the yield could be 81%.

结果表明，所合成的化合物B的结构与预期的结构一致；热性能研究表明，化合物B在242.2~750℃质量损失为54.39%，1000℃时仍有25.11%的炭残渣，显示出优异的热稳定性和成炭性；在相同反应条件下，用乙腈作为溶剂的反应产率比使用氯仿和二氯乙烷为溶剂的高，并且在合成过程中，单独使用三乙胺作为缚酸剂时产率很低，而当同时加入少量4-二甲氨基吡啶时，产率可达81%。

The thermal decomposition characteristics of trimethylolethane trinitrate have been investigated by means of pressure DSC.

利用高压DSC研究了含能材料三羟甲基乙烷三硝酸酯的热分解特性，结果表明：尽管TMETN与硝化甘油结构相似，但TMETN的分解特性完全不同于硝化甘油。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。