查询词典 nitrating

Results showed N_2O_5/CH_2Cl_2 was a relatively mild system, its nitrating ability of arene was weak, but the para-selectivity of product was satisfactory. Series of ZSM-5 catalysts could improve para-selectivity of product and meanwhile enhance the yield.

结果表明：N_2O_5／CH_2Cl_2是一个相对温和的硝化体系，对芳烃的硝化能力很弱，但产物的对位选择性很好；ZSM-5系列催化剂在显著提高对位产物比例的同时也能提高硝化的产率。

A heavy yellow poisonous oily explosive liquid obtained by nitrating glycerol; used in making explosives and medically as a ''.

一种重的、黄色有毒油状爆炸性液体，由甘油硝化制成，用于制炸药，医学上用作血管舒张药。

The distillation-nitration method is a new process for nitrating toluenc toTNT.

引言 TNT是近代军事上应用最广泛的猛炸药之一。

Among them, nitrate-sulfuric acid system with higher nitrating activity can get high yields at mild condition in the nitration of deactivated aromatic compounds and could be used in the laboratory and industrial applications.

其中，硝酸盐/硫酸体系具有较强的硝化能力，对于钝化芳环，可以在温和条件下以高收率得到硝化产物，在实验室制备或工业应用中具有较高的应用价值；其他硝化方法由于各种原因暂时不能对钝化程度较高的芳环进行硝化，还需进一步研究具有较高活性的硝化体系。

Oxidative and nitrative injury in human umbilical vein endothelial cells (ECV304) induced by high glucose and exogenous nitrating agent were detected by cell biological and chemical methods.

采用细胞生物学及化学方法，检测了高浓度的糖和外源性硝化试剂作用于人脐静脉内皮细胞(ECV304)后所导致的细胞蛋白氧化损伤及硝化损伤。

The ring-open nitration of propylene oxide compounds was investigated using dinitrogen pentoxide as nitrating agent.

并以N2O5为硝化剂考察了环氧丙烷类化合物开环硝化过程，探讨了取代基的电子效应和立体效应对环氧丙烷类化合物开环硝化过程的影响规律。

The green synthesis of nitrate esters using dinitrogen pentoxide (N2O5) as nitrating agent was briefly summarized.

评述了N2O5为硝化剂制备硝酸酯类含能材料的绿色合成技术，分析了N2O5-有机溶剂硝化、N2O5-固体载体硝化和引入保护基硝化等三种体系工艺的过程和特点，展望了各硝化体系的发展前景。

The result of above three aspects indicates:(1) under these optimize conditions,the yield of nitrating reaction is 95.52%, the yield of phase transfer catalysis fluorination is 90.03%, the yield of chlorination is 87.5%,and the reaction total yield is 75.47%, which are higher than the yields reported, the purity of product is 98.5%.

上述研究结果表明：(1)在实验所得的工艺条件下，硝化收率为95.52%，相转移催化收率为90.3%，氯化收率为87.5%，反应总收率达到75.47%，产品纯度为98.5%，均高于文献所报导收率。

The total reaction could be explained by two steps.The first was a fast pre-equilibrium,activation nitrating reagent transferred to the catalyst.

反应共分两部进行：第一步是快速的预平衡步骤，活性硝化剂转移至催化剂上；第二步是缓慢的速率控制步骤，粘结在催化剂上的活性硝化进攻试剂与底物反应生成目标产物。

Nitroglycerin is obtained by nitrating glycerol.

硝化甘油是经过硝化丙三醇得来的。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。