查询词典 bromide

Using cetyl trimethyl ammoniunm bromide as templating agent, the mesoporous TiO_2 with special performance was synthesized by a tartaric acid sol-gel method. The UV irradiation was used in this process.

以十六烷基三甲基溴化胺为模板剂，采用溶胶-凝胶法，在溶胶-凝胶制备过程中引入紫外光照辐射，制备出具有一定特殊性能的中孔TiO2材料。

Methods A developed Cetyl Trimethyl Ammonium Bromide method and Qiagen DNeasy plant mini kit were used to extract DNA from papaya seed and fruit.

目的 建立对抗环斑病毒转基因番木瓜55-1进行品系鉴定的检测方法。

The chemical structure of the product was characterized by means of the melting point and IR. The results show that tetraethylammonium bromide which was used as a phase transfer catalyst in this reaction had optimization effect on the interfacial diffusive reaction of BTC and PNP. Higher concentration of sodium hydroxide, lower temperature and a higher dosage of BTC produced a small amount of 4-nitrophenyl chloroformate, while lower concentration of sodium hydroxide and a lower dosage of BTC made reaction incomplete, which affected the yield.

结果表明，在碳酸二（4-硝基苯基）酯合成中使用的相转移催化剂四乙基溴化铵对受界面扩散控制的BTC气与对硝基酚钠反应有良好的相转移催化效果；氢氧化钠质量分数较低时，酚钠盐向溶有BTC的油相扩散速度较小，较高时会产生氯甲酸对硝基苯酯；温度较低、BTC量较高时，会产生少量氯甲酸对硝基苯酯，BTC用量较低会使反应不完全，这些都影响着收率。

Anthraquinone is prepared by the liquid phase oxidation of anthracene with oxygen in the presence of cobaltous salt,manganous salt and bromide.

在液相中，钴盐、锰盐、溴化物催化氧气氧化蒽制取蒽醌，当压力为0.5～0.8 MPa，溶剂是芳香性卤代烃和丁酸的混合物（其中丁酸质量分数为15％～20％）时，蒽醌的产率可达90％，纯度99.2％。

With the experimental results, analyzes the lithium bromide absorption refrigeration system more comprehensibly.

与实验结果分析相结合，使得对吸收式制冷系统的分析更加全面

In this investigation,the composition of copolymer P(AM- co -NaAMPS) of acrylamide and 2-acrylamido-2-methyl-propanesulfonate sodium has been determined with the aqueous solution of cetyl trimethyl ammonium bromide as titrant at a concentration of 0.001 mol·L-1 by conductometric titration method.

与元素分析进行比较的结果表明，上述复合作用电导滴定法可作为测定水溶性大分子链中磺酸盐单体含量的方便而又准确的方法，而且预计还可用作为测定水溶性大分子链中其它离子性基团含量的简捷方法。

Secondly, the reaction of crotyl bromide and carbonyl compounds promoted by dysprosium were studied. The γ-adduct of crotyl was mainly obtained in the reaction of ketone and ester. While the α-and γ-adduct mixture were obtained in the reaction of aldehyde.

其次，还研究了镝促进下巴豆基溴与羰基化合物的反应，酮和酯主要得到巴豆基γ-位进攻的产物，而醛则得到α与γ位进攻的混合产物。

Benzyl bromide was synthesized from dibenzyl ether and hydrobromic acid with SO42-/ TiO2 as catalyst and cyclohexane as dehydrant.

以二苄醚和氢溴酸为原料，SO42-/TiO2为催化剂，环已烷为带水剂，合成了溴化苄。

The reason may be that complex formed by rhodium and halide was difficult to produce the catalytic active species. Therefore halide ion was the poison for the rhodium catalyst in hydroformylation of olefins in ionic liquid. The effect of double long chain cationic surfactant (DCMAB, dicetyl dimethylammonium bromide) on selective hydrogenation of cinnmaldehyde catalyzed with RuCl3·x H2O/TPPTS was studied.

进一步的研究表明在使用有良好反应活性的两种催化剂HRh3 、Rh_2进行催化反应时，向体系中加入含有卤离子的化合物时将使反应活性大大降低，而且随着卤化物加入量的增加，催化剂的活性迅速下降，这是卤离子可能和金属铑作用使它难于生成催化活性物种，进一步证明卤素离子是引起催化剂活性下降的极其重要的因素。

In chapter four, the preperation of ytterbium diiodide was examined. The reductive cleavage of Se-Se bond and S-S bond induced by ytterbium diiodide was investigated. The reaction of diselenides and disulfides with allylic bromide promoted by ytterbium diiodide was also examined. The intermolecular Barbier-type reaction induced by ytterbium diiodide was studied. In the last section of this chapter, the intermolecular reductive coupling of nitriles with azides induced by samarium diiodide was investigated.

第四章，研究了二碘化镱的制备方法，以及二碘化镱作为一种优良的单电子转移试剂在有机合成中的应用：二硒醚的Se--Se键和二硫醚S-S键的还原断裂，及其在合成烯丙基硒醚，硒代酯和烯丙基硫醚，硫代酯中的应用，实验结果表明二碘化镱也能促进分子间的Barbier反应，而文献认为二碘化镱不能促进分子间的Barbier反应；最后研究了二碘化钐促进的叠氮化合物与腈的交叉还原偶联反应，一步高收率地制备脒的方法。

But GST= 0.156, Nm=1. 588. As a result, the foundation of Youyongchi Avicennia marina population was the result of the migration of hypocotyles and human factors.

这项工作可以为海岸防护林中新引进种类的判定以及为研究种群建立者效应方法的确定提供科学依据。

The two-dimensional CDRC-ADI-FDTD update equations for collision unmagnetized plasma are induced. The unconditional stability of the CDRC-ADI-FDTD formulation for collision unmagnetized plasma is obtained by the examples.

推导了碰撞非磁化等离子体中的二维CDRC-ADI-FDTD迭代公式，并用算例验证了碰撞非磁化等离子体CDRC-ADI-FDTD算法也是无条件稳定的。