查询词典 nitrating

So, N_2O_5/organic solvent and N_2O_5/HNO_3 are two complemental nitrating systems.

因此，N_2O_5／有机溶剂和N_2O_5／HNO_3是两种互补的硝化体系。

The effect of the molar ratio of guaiacol/methyl- nitrate ,the reaction temperature, the reaction time, the choices of nitrating agent and solvent in the synthesis of 5 -nitro-guaiacol has been studied.

本文研究了愈创木酚／硝酸甲酯的摩尔比、反应温度、反应时间，硝化剂和溶剂的选择对5——硝基愈创木酚合成的影响。

Results showed that the former afforded an yield over 80% and the regioselectivity up to 5.4, both were higher than that using nitrous acid as nitrating agent.

结果表明：以硝酸铜作硝化剂时的硝化收率可达80%，P/O比值最高为5.4，均比用相同浓度的硝酸作硝化剂时要高。

The synthetic route of glycidyl nitrate was improved. Glycidol was synthesized by the cyclization process from allyl alcohol and m-CPBA, then glycidyl nitrate was synthesized with glycidol as raw materials and HNO3/ 2O as nitrating agent.

为了改进缩水甘油醚硝酸酯的合成路线，以丙烯醇为原料，经间氯过苯甲酸环氧化后得到缩水甘油醇，然后GA经硝酸／醋酐硝化后得到了GN，硝化产物GN的收率为70.2%，经过减压精馏后GN的纯度达到了98.9%。

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%。

Then, N-(5-nitro-6-chloro-3-pyridinemethyl) phthalimide is obtained after the nitrating reaction of N-(6-chloro-3-pyridine methyl) phthalimide. The yield of the obtained product is 90.5%, and its melting point is 143.1~143.8℃.

缩合产物再经过硝化，合成N-（5-硝基－6-氯－3-吡啶甲基）邻苯二甲酰亚胺，其熔点为143.1~143.8℃，收率为90.5%。

Here we describe a gene in the plant pathogen Streptomyces turgidiscabies that encodes a NOS homologue, and we reveal its role in nitrating a dipeptide phytotoxin required for plant pathogenicity.

作者描述了植物致病菌Streptomyces turgidiscabies中一种编码NOS同源物的基因并揭示了其在植物致病性中所需的对植物毒素二肽的硝化作用。

Here we describe a gene in the plant pathogen Streptomyces turgidiscabies that encodes a NOS homologue, and we reveal its role in nitrating a dipeptide phytotoxin required for plant pathogenicity.

氮氧化物在哺乳动物的细胞信号作用和免疫响应中发挥重要功能，当基因组测序研究显示细菌同哺乳动物一样也存在&氮氧化物合成酶&时，似乎可以说，氮氧化物在细菌中也可能扮演类似角色。

The results show high selectivity when the temperature is controlled at 50 CC , and the nitrated reaction time is 90 mm, toluene is nitrated by using 95% nitric acid as nitrating reagent at the presence of acetic anhydride, 1.0g silicotungstic acid catalyst is calcinated at 300℃ for 1.5h. The o/p (ratio of ortho to paro isomer of toluene nitration) ratio is 0.89 in product distribution of toluene nitration, lower than 1.67 using sulfonitric acid as catalyst. The yield of products is 91.6%.

结果表明，在醋酐存在条件下，以CCl4为溶剂，以质量分数为95%的硝酸为硝化剂，反应温度控制在50℃，反应60 min， 1.0g经300℃焙烧1.5h后的硅钨酸催化剂，对甲苯表现出强的区城选择性，甲苯硝化产物o/p值（甲苯硝化产物邻位和对位异构体的质量比）达0.89，较硝硫混酸的1.67显著降低，产物收率达到91.6%。

A safe method for p reparing nitro form isp resented which consists of nitrating a startingma2terialwhich the starting material dissolved or sus2pended in sulfuric acid, and a nitrating agent con2sisting of nitric acid, nitrate salts or nitrogen pentoxide is added to the sulfuric acid solution / sus2pension at 210℃ to + 80℃.

当汉语长难句内容的叙述层次与英文基本一致时，可以按照顺序翻译。例10 介绍了一种制备硝仿的安全方法，该方法首先硝化起始原料，起始原料溶解或悬浮于硫酸中，然后在- 10℃～+ 80℃，将硝化剂(由硝酸、硝酸盐或N2O5 组成)加入硫酸溶液或悬浮液中。

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％。