溶剂

In dilution solvent add 3-5% ring acetophenone or ethers solvent

在稀释溶剂里加入3－5%环乙酮或醚类溶剂

The reaction process in methanol solvent can be deduced from the computational results with CPCM solvent model and the supermolecular handling, namely the reaction involves four steps in the methanol solvent. The nucleophilic addition of trimethylamine to acraldehyde generates an enolate. Nucleophilic attack of the enolate on the aldehyde forms the carbon-carbon bond, followed by the proton-transfer process and the further elimination generating the product and liberating the trimethylamine catalyst.

对于CH3OH对反应体系的影响，可以综合考虑CPCM溶剂模型及超分子模型下的研究结果，即CH3OH溶剂中反应按四步进行，催化剂三甲胺首先与丙烯醛发生亲核加成，生成的两性离子中间体与甲醛发生类似于Aldol的醛醇缩合，形成碳-碳键，之后发生分子内质子转移，最后经E1cb消除得到产物，并释放催化剂三甲胺。

But in the case of acylate wood, pET solvent, it can be completely free from the influence of solvents.

但如是丙烯酸酯材、pET的耐溶剂性就强，可以完全不受溶剂的影响。

The results showed that the addition of the rare earth compound or the organic solvents could strengthen obviously taxol release, specially the organic solvents.

结果表明在红豆杉细胞悬浮培养中，分别加入稀土化合物和有机溶剂都明显促进紫杉醇的释放，特别是有机溶剂更显著促进紫杉醇的释放。

The design improvement of the structure of A cylinder, the use of superheated solvent vapour, the connection way of fan and cyclone separator, the vacuum device of B cylinder and the airtightness of the system were described.

重点阐述了溶剂过热蒸汽低温脱溶装置中A筒结构、A筒溶剂过热蒸汽的使用、风机与刹克龙的联接方式、B筒负压装置、系统的封闭性等问题的设计改进。

It was found that solvent pyridine plays an important role in the formation of nanocrystalline nickel selenides due to its appropriate coordinative ability and alkalescence.

又在50℃的温度下，在吡啶溶剂中以水和肼为还原剂，得到了Ni〓Se和NiSe〓，纳米晶溶剂吡啶由于具有合适的配位能力及碱性而在反应中起了关键作用。

The formation of organogels was greatly influenced by the solvophilic interaction of alkyl groups and the characteristic of solvents.

不同烷基链长的亲溶剂作用以及溶剂性质对有机分子凝胶的形成有较大影响。

In this paper, through a series of experiments, two series of quaternary-ammounium Gemini surfactants were synthesized, namely the pair alkylene double quaternary ammonium salt surfactant m-s-m·2Br and the pair the alkylene double quaternary ammonium salt surfactant -s-·2Br. We has carried on the attribute with the infrared spectrum to its structure, and to affected the factor which the synthesis pair the alkylene double quaternary ammonium salt surfactant responded to carry on the discussion. We has discovered the synthesis pair the ethylene double quaternary ammonium salt surfactant m-2-m·2Br optimum condition: The bromo alkane and a tetramethyl ethylene diamine mole of ratio is 3.0: 1.0, makes the solvent by the ethyl alcohol, 80℃ under responds for 48 hours in the backflow temperature; Synthesis pair alkylene double quaternary ammonium salt surfactant 12-S-12 ·2Br optimum condition: 12 tertiary amine and 1, 3- propylene dibromide (1, 4- two bromines butane) a mole of ratio is 2.2: 1.0, makes the solvent by the ethyl alcohol, responds for 48 hours in the constant temperature 80 ℃ under backflow.

本文通过一系列的实验，合成了两个系列的Gemini型表面活性剂，即双烷撑双季铵盐表面活性剂m-s-m·2Br和双烷撑双季铵盐表面活性剂-s-·2Br，用红外光谱对其结构进行了表征，并且对影响合成双烷撑双季铵盐表面活性剂反应的因素进行了讨论，找出了合成双乙撑双季铵盐表面活性剂m-2-m·2Br的最佳条件：溴代烷与四甲基乙二胺的摩尔比为3.0：1.0，以乙醇作溶剂，在回流温度80℃下反应48小时；合成双烷撑双季铵盐表面活性剂12-s-12·2Br的最佳条件：十二叔胺与1，3-二溴丙烷(1，4-二溴丁烷)摩尔比为2.2：1.0，以乙醇作溶剂，在恒温80℃下回流反应48小时。

Aloin is unstable when dissolved in methanol, acetyl acetate was appropriate for use as the solvent in standard solution.

芦荟苷在甲醇溶剂中不稳定，甲醇不适宜做芦荟苷标准样的溶剂，宜改用乙酸乙酯。

The different effects of water-miscible organic solvents on the esterase and amidase activities of trypsin have been known for some time.

本文首次报道在单相共溶剂体系通过溶剂的疏水作用对木瓜蛋白酶的酰胺酶活性和酯酶活性进行调控。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了