查询词典 nitration

The optimum reaction conditions were: at present of acetic anhydride, a stoichiometric quantity of nitric acid, at room temperature for 40 minutes. Nitration of chlorobenzene gave a,50% yield of mononitro compounds, and an ortho-para isomer ratio 0.20 in product distribution of chlorobenzene mononitration.

结果表明：硅钨酸催化性能较好，催化剂载体以纳米二氧化硅最好，反应条件中醋酸酐用量是主要影响因素；SiW_(12)O_(40)~(4-)／纳米SiO_2催化剂具有强对位选择性：在醋酸酐存在下，氯苯与等当量的硝酸室温下反应40分钟，氯苯一硝化产物中邻／对硝基氯苯异构体的质量比达0.2，产率可达50％。

In a monophase microemulsion where the oil phase was replaced by an ionic liquid, high ortho-selectivity of nitration of phenol can be achieved.

在以离子液体取代庚烷形成的单相微乳液体系中，则可以获得较高的邻位选择性。

First of all, a monophase microemulsion was prepared with Triton X-100 as surfactant, and the nitration of phenols by concentrated nitric acid in the systems was studied. The influence of the mass fraction of nitric acid, oil/water volume ratio, reaction temperature and other factors on the reaction conversion and selectivity was examined.

首先在非离子表面活性剂Triton X-100形成的单相微乳体系中，用浓硝酸对苯酚进行选择性硝化反应，研究了硝酸的质量分数、微乳中油/水比、反应温度等因素对反应转化率及硝化选择性的影响。

The nitration of toluene was carried out in the presence of acetic anhydride with CCl4 as solvent, 95% nitric acid as nitrating reagent, and niobic acid calcinated at 300℃ for 3 h as catalyst for 60 min at 40℃.

实验结果表明，当反应温度为40℃，反应时间为60min时，以CCl4为溶剂，以质量分数为95%的硝酸为硝化剂，在醋酐存在条件下，以经300℃焙烧3h后的铌酸作为催化剂，甲苯硝化产物中异构体的邻对比达1.26，较硝硫混酸的1.67显著降低，产物得率达99.3%。

Amino 5 nitrophenol was synthesized using o aminophenol and urea as raw materials through cyclocondensation ,nitration and alkaline hydrolysis in turn.

以邻氨基苯酚和尿素为原料，对环合、硝化、碱性水解的传统工艺进行改进，合成了 2 氨基 5 硝基苯酚。

The reactions include, organometallic reactions (grignard reaction, organolithium -zinc, and -copper chemistry ), metal catalyzed reactions, mannich reaction, nitration, hydrogenation, azidation, amino-protection reactions, organoalluminum catalyzed beckmann rearrangement, schmidt rearrangement, epoxidation, epoxide ring opening reactions, swern oxidation etc.

这些反应包括：有机金属反应(格利亚反应，有机锂，有机锌和有机铜反应)，金属催化反应堆(suzuki 反应， negish 反应)， mannish 反应，硝化反应，氢化反应，叠氮反应，各种基团的保护和脱保护反应，有机铝催化的贝克曼重排反应，斯密特重排反应，环氧化反应，环氧烷开环反应， swern 氧化反应等。

The results show that air plasma causes surface wettability improvement, surface roughness, surface oxidization and nitration.

结果表明：处理后表面润湿性改善，表面微结构形貌粗糙化，表面发生氧化和氮化。

In order to solve the problem of producing large amounts of wastes and undesired o-nitrotoluene in synthesis of p-nitrotoluene with the mixed concentrated mineral acids,the catalytic activity of phosphotungstic acid for selective nitration of toluene was studied and the optimum conditions for preparing the catalyst were investigated.

为解决硝硫混酸对硝化甲苯过程中因甲苯的非选择性硝化产生的o-MNT和大量废酸对环境的危害，研究了磷钨酸对甲苯硝化反应的催化活性。

Further study demonstrated that peroxynitrite also induced tau nitration in neuroblastoma N2a cell line, and the nitrated tau was accumulated in the cells.

进一步研究发现：用PN处理稳定表达tau蛋白的N2a细胞，可以诱导细胞内tau蛋白的硝基化，而且硝基化的tau蛋白在细胞内发生聚积。

Our purposes are to research and sieve direction-selected nitration agents which will be added to the process of when chlorobenzene is nitrated and to make reaction proceed toward ONCB and to raise the proportion of ONCB to 40-50%.

本项目通过对定向硝化剂的研究和筛选，在氯苯硝化时加入选定的定向硝化剂，使硝化向邻位定向进行，提高邻硝比例达到40～50%。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。