查询词典 diazo reaction

In the presence of catalytic rhodium acetate, ethyl 2-diazo-3-oxo-per fluoroalkanoates, reacted readily with nitriles to give a series of 5-fluoroalkyl substituted 1, 3oxazoles with high regio-selectivity through a metal carbenoid intermediate. The reactions of carbenoids with noncyclic vinyl ethers or cyclic vinyl ethers afforded dihydrofuroates in good to excellent yields. Interestingly, only vinyl C-H insertion compound was obtained concerning of the reaction of carbenoids with 2, 5dimethylfuran due to the steric hindrance of methyl group

醋酸铑分解2-重氮-3-氧代-全氟羧酸乙酯形成的金属卡宾作为1，3-偶极体，可以与一系列芳基或烷基取代的腈反应，高度区域选择性地生成一系列4-乙氧羰基-5-氟烷基取代的噁唑化合物；也可以与富电子的链状和环状的烯基醚反应，以优良的产率得到一系列氟烷基取代的二氢呋喃类化合物；而与2，5-二甲基呋喃的反应，由于甲基的位阻作用，只得到金属卡宾对呋喃3-位烯基碳氢键插入产物。

A fully automated simultaneous determination of nitrate and nitrite in water samples by sequential injection analysis based on the Griess diazo-coupling reaction and the formed azo dye for nitrite at 540nm and reduction to nitrite using coppered cadmium column.

用顺序注射分光光度法，通过一次进样。同时测定硝酸根和亚硝酸根。亚硝酸根是根据格里斯重氮－偶联反应，形成偶氮染料后在波长540nm下进行检测。而硝酸根则通过镀铜镉粒还原柱还原为亚硝酸根后进行测定。

The process of Acid Red 2GL is mainly introduced in this paper,and the conditions of both diazo- couple reaction and complexation reactions are also discussed.

本文主要论述了中性红2GL染料的合成工艺路线，并对重氮偶合反应和络合反应条件进行了讨论。

To improve the nonlinear optical property and stability of azo-dye chromophore, the nonlinear optical polyimide attached with azo chromophore side-chain is synthesized by diazo coupling reaction of 4-nitrohenzediazonium tetrafloroborate.

为了提高材料的非线性光学性能和偶氮染料发色团的稳定性能，通过对－稍基苯基重氮氟硼酸盐的重氮偶合反应，合成了侧链含偶氮非线性光学活性基团的聚酰亚胺材料，幷用红外光谱对其进行了结构表徵。

To dye the different types of fibers by the same dye, universal dyes based on naphthalene ring system are prepared by the diazo coupling reaction of 7-acetamide-4-hydroxy-2-oaphtialene-β-(N,N-dimethylaminoethyl)solfonamide and m-aminobenzene-β-hydroxyethyl sulfone sulfunate.

为了实现用同一支染料对不同类型的纤维进行染色的目的，通过间氨基苯基－β-羟乙基砜硫酸酯与7-乙酰氨基－4-羟基－2-萘－β磺酰胺的重氮化偶合反应合成了含萘环的通用染料，其结构通过质谱分析进行了表征。

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。