查询词典 diazo reaction

A new spectrophotometric method for the determination of trace nitrite was studied.The method is based on the diazo-reaction of brilliant cresol blue with nitrite.

本文研究了在盐酸介质中微量亚硝酸根与煌焦油蓝发生的重氮化反应，建立了测量微量亚硝酸根的新方法。

The method is based on the diazo-reaction between nitrite ion and fuchsin acid in a hydrochloric acid medium.

研究了在酸性介质中，NO2-与酸性品红发生重氮化反应，致使酸性品红的荧光强度随NO2-加入量增加而明显降低的现象，建立了荧光熄灭法测定痕量NO2-新方法。

The addition reaction of diazo pyrazoles and isocyanate has been investigated and the mechanism of this reaction has been guessed.

研究了重氮基吡唑同异氰酸酯的环加成反应，初步推测了该反应的机理。利用此反应设计了一类可能具有生物活性的吡唑骈[5，1-d][1，2，3，5]四嗪-4-酮类衍生物。

A new fluotescence quenching method has been developed to determine nitrite in water samples. The method is based on the diazo-reaction between nitrite ion and thionine in dilute suifuric acid medium.

文章研究了在稀硫酸介质中亚硝酸根与硫堇发生的重氮化反应，基于硫堇的荧光强度随亚硝酸根的加入量增加而明显降低的现象，建立了荧光猝灭法测定痕量亚硝酸根的新方法。

The experiments on the chemical synthesis of DL-phenylalanine employed the Modified Aniline way, the Diazo Reaction, Hydrolysis Reaction, and Aminate Reaction in turm to synthesize the DL-phenylalanine.

混旋苯丙氨酸化学合成实验部分首先采用改进苯胺法，经重氮化反应、Meerwein反应、水解反应、氨化反应，合成混旋苯丙氨酸，收率达到84％。

The yield was 84%. With OP-10, NPE as the the catalyzer for the diazo reaction, the use of hydrolyzed propenenitrile instead of propenoic acid, and OP-10 as the catalyzers of the aminate reaction, these experiments showed the feasibility of industralization, due to the much reduced costs, shortened reaction time and a higher yield.

采用壬基酚聚氧乙烯醚（OP-10）、萘磺酸甲醛缩合物作重氮化反应催化剂，丙烯腈加成、水解替代丙烯酸，OP-10做氨化反应催化剂，通过四因子三水平正交试验法实验，得到较佳反应参数，反应时间、收率、成本都大大降低，适宜工业化生产。

The method to determine the primary amino content in the polymethylene polyphenyl polyamine through the quantitative diazo reaction of primary amino and nitrous acid was researched.

研究了利用伯胺基与亚硝酸定量发生重氮化反应测定多苯基多次甲基多胺中伯胺基含量的方法，确定了最佳测定工艺条件，其分析结果的最大相对误差及相对平均偏差在0。

The conjugated bilirubin in the incubation media was estimated by a direct diazo reaction before and after the incubation.

在孵化培养基中的结合胆红素是由孵化前和后直接重氮反应来评估的。

A new convenient synthesis of a series of 1-aryl-2-propanones using aromatic amine s as precursors, via diazo reaction and improved Meerwein arylation reaction under mild conditions, was achieved.

以芳香胺为原料，经重氮化和改进的Meerwein芳基取代反应，合成了一系列的1-芳基-2-丙酮，其中1-(3，5-二三氟甲基苯基)-2-丙酮是一个新化合物。

A new convenient synthesis of a series of 1-aryl-2-propanones using aromatic amines as precursors, via diazo reaction and improved Meerwein arylation reaction under mild conditions, was achieved. In addition, 1-[3,5-bisphenyl]-2-propanone is a new compound among the synthesized compounds. This approach is an efficient synthetic method for the aryl-propanones with the different substituting groups.

以芳香胺为原料，经重氮化和改进的Meerwein芳基取代反应，合成了一系列的1-芳基－2-丙酮，其中1-（3，5-二三氟甲基苯基）2-丙酮是一个新化合物改进后的方法简化了合成步骤，提高了收率，可方便地用于在苯环上具有不同取代基的芳基丙酮的合成。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。