查询词典 nitro-pentaerythrite

However, the synthetic potential of plant cells as a reducing agent of the nitro group has never been discovered, despite the fact that the reduction of nitro compounds is one of the most classical reactions in organic synthesis.

然而尽管硝基还原是最为经典之一的有机反应，在有机合成上还没有使用植物细胞还原芳香硝基化合物的报道。

The hydroxy and nitro-substituted coumarins were able to inhibite hemolysis of human red blood cells and damage of DNA induced by AAPH. It reveals that these compounds are effective antioxidants. Some coumarins have cytostatic and cytotoxic activity for HL-60 cell lines. In general, their effects were weakened when coumarins own nitro group.

含有羟基和硝基的香豆素衍生物对自由基诱导的人血红细胞溶血有一定的抑制作用，且对AAPH诱导的DNA损伤有不同程度的保护作用，部分香豆素衍生物对人早幼粒白血病细胞（HL-60）的增殖表现出一定的抑制作用。

In conclusion, the nitro group is the main toxic group for both nitrobenzenes and nitroanilines. Wrapping or reducing the nitro groups will decrease the toxicity of the subject chemicals.

总之， 硝基是这两类化合物致毒的主要基团，将硝基包覆或还原为氨基应为此类化合物解毒的重要途径。

amino-1,4-naphthoquinones failed to be obtained through the classical routes due to the strongly electron-withdrawing nitro group, which deactivating the nucleophilic ability of the nitro anilines.

2-硝基苯胺-1，4-萘醌类衍生物由于硝基的强吸电性使硝基苯胺的亲核性减弱，不能通过经典的加成-氧化或加成-取代的方法合成得到。

Nitrations of both hydroxyl- and acetamino-substituted porphyrins were found to take place at the adjacent position of the substituent in the very aryl ring, whereas nitro group was guided into para positions of unsubstituted phenyl ring during the nitration of nitro-substituted porphyrin.

结果表明，羟基和乙酰氨基卟啉的硝化反应发生在与该取代基处于同一芳环的meta位，而硝基卟啉进行硝化时，硝基取代于其他未取代苯环的para位。

Nitro Toyz is right here so we can reach all your Nitro RC wants at fantastic prices.

硝基toyz是正确的在这里，让我们可以达到您所有的硝基区局要在幻想的价格。

The results show that the atmosphere has a big influence on the thermal stability of C_(60).C_(60) begins to decompose at 423.5℃in the air,the deomposed peak temperature is 668.5℃,but very stable in the helium atmosphere,only sublimate,the crystal shape of C_(60) has a certain influence to its thermal stability.The synthesized nine kinds of nitro-fullerene derivatives all have good thermal stability and their decomposed peak temperatures all exceed 350℃.The thermal explosion temperature for 5 seconds delay of product 4 is 253℃.The category,number and position of nitryl group in nitro-fullerene derivatives all have influence on their thermal stability.

利用差热分析仪和DSC-TG综合热分析仪对C_(60)及其硝基衍生物的热稳定性进行了研究，结果表明，环境气氛对C_(60)热稳定性影响很大，C_(60)在空气中423.5℃开始分解，放热峰值温度为668.5℃，在氦气中很稳定，仅表现为升华，C_(60)的晶型对其热稳定性也有一定的影响；合成得到的九种硝基富勒烯衍生物都具有较好的热稳定性，分解峰值温度均高于350℃；产物4的5秒爆发点测试结果为253℃。

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，河北双龙银粉漆厂油漆价格低于其它厂1/2 ，来电话即告之最低价格；★数千种色油漆，醇酸油漆，硝基油漆，有机硅漆，快干油漆，丙烯酸漆，白厚漆，铅油，调合漆，醇酸磁漆，银粉漆，防锈漆，各种底漆，面漆，工程用漆，钢铁用漆，硝基磁漆，耐热耐高温漆，马路划线漆，环氧煤沥清漆，烟囱漆，过氯乙烯漆，数百种工业、民用油漆价格低于其它厂1/2 ；一桶也可以最低价发货，一桶也可订做！

We focused the study on the synthesis methods of quinoxaline, nitration of its aromatic ring and chlorination of its heterocycle. In this paper, we thought about environmental protection, the cost of material, the feasibility of industrialization, workup easily, and obtained 2,3(1H,4H)-quinoxalinedion, 6-nitro-2,3(1H,4H)-quinoxalinedion, 6,7-dinitro-2,3(1H,4H)–quinoxalinedion, 2,3-dichlo- roquinoxaline, 6–nitro-2,3-dichloroquinoxaline,and 6,7- initro-2,3-dichloro-quinoxaline. A more reasonable, easily, efficient and simple reactive route to synthesize above-mentioned compounds was developed by systematically investigating the yield, the purity and physical character of intermediates.

本文针对喹喔啉及其芳环硝化、杂环氯代的合成进行研究，主要考虑了环保性、原料成本、产业化的可行性、反应操作的简便性等问题，获得了2，3(1H，4H)-喹喔啉二酮、6-硝基-2，3(1H，4H)-喹喔啉二酮、6，7-二硝基-2，3(1H，4H)-喹喔啉二酮、2，3-二氯喹喔啉、6-硝基-2，3-二氯喹喔啉和6，7-二硝基-2，3-二氯喹喔啉等六个中间体，考察了反应产物的产率、纯度和性状等因素，得到了更为合理、方便、实用、简洁的可供产业化的合成路线。

Nonlinear optical organic materials have more advantages than inorganic materials. Based on the molecule design, a new D-π-A structure NLO chromophore molecule [4-nitro-4'-N,N-di aminoazobenzene] 3 with nitro, azobenzene and epoxy is synthesized.

以环氧氯丙烷、苯胺、对硝基偶氮苯胺为原料，设计并合成了一种具有推拉电子结构、含双环氧基的偶氮类有机非线性光学发色团分子4-硝基－4'-N，N-二缩水甘油氨基偶氮苯。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。