查询词典 iodic anhydride

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%。

The stereochemical effect of the chiral amino acid residues on the formation of penta-coordinate phosphorus intermolecular mixed carboxylic-phosphoric anhydride from N-phosphorylamino acids was studied with density functional theory calculations at B3LYP/6-311G level.

用密度泛函方法在B3LYP/6-311G水平上对N-磷酰化氨基酸生成五配位磷酸羧酸混酐反应中手性氨基酸残基侧链的立体化学效应进行了研究。

Succinic acid dehydration is one of industrial methods to produce succinic anhydride.

丁二酸脱水法是工业生产丁二酸酐的方法之一。

The hydrophobic core serves as a reservoir for water-insoluble drugs.Hence,these nanoparticles can be used as carriers for hydrophobic drugs.For the synthesis of cholesterol-modified glycol chitosan conjugates,a carboxyl group was initially introduced to cholesterol molecule using succinic anhydride,and then covalently coupled with the primary amino group of glycol chitosan in the presence of 1-ethyl-3-(3-dimethylaminopropyl)-carbodiimide hydrochloride and N-hydroxyl succinimide.

本文采用二步反应将胆固醇接枝到乙二醇壳聚糖，首先将胆固醇进行羧基化，将胆固醇与琥珀酸酐反应生成胆固醇半琥珀酸酯，然后用1-乙基-3-(3-二甲基氨丙基)碳二亚胺盐酸盐与N-羟基琥珀酰亚胺作为偶联剂，将胆固醇半琥珀酸酯的羧基与乙二醇壳聚糖主链的氨基进行反应，得到胆固醇疏水改性乙二醇壳聚糖共聚物。

Using Maleic anhydride and 1-Octadecanol as raw material, synthesize octadecanol maleic monoester.The influence of p-toluence sulphonic acid were investigated.

以马来酸酐和十八醇为原料合成了马来酸单十八酯，研究了催化剂对甲基苯磺酸的加量产物的影响。

The di- octadecanol maleic was prepared with maleic anhydride and octadecanol as raw materials and p-toluene sulphonic acid as catalyst.

以马来酸酐和十八醇为原料，以对甲苯磺酸为催化剂，制备马来酸双十八醇酯。

Under the microwave radiation condition, single octademaleat was synthesized with malefic anhydride and octadecanol as raw materials and ptoluene sulphonic acid as catalyst.

在微波辐射条件下研究以马来酸酐和正十八醇为原料，对甲苯磺酸为催化剂，合成马来酸单十八酯。

The mechanical property and thermal stability of cured epoxy resin were closely related to the chemical structure of hydrogenated terpinene maleic anhydride.

氢化萜烯马来酸酐的化学结构与固化物的机械强度及热稳定性密切相关。

The properties of mechanical strength, thermal stability and electrical insulation of the epoxy resin cured with hydrogenated terpinene maleic anhydride and their main influencing factors were investigated.

研究了氢化萜烯马来酸酐与环氧树脂固化物的机械强度、热稳定性及电气绝缘等性能及其主要影响因素。

The curing reaction of hydrogenated terpinene maleic anhydride with bisphenol epoxy resin was investigated by FT-IR spectrum, and the curing degree, gelation time and its affecting factors acre analyzed.

采用FT-IR光谱研究了氢化萜烯马来酸酐与双酚A型环氧树脂的固化反应过程，并分析了固化度、凝胶时间及其主要影响因素。

In the days of sailing vessels the crew were afraid they would be becalmed on the ocean.

在使用帆船的时代，船员们担心他们会因为无风而无法在海洋上航行。

As long as foreign donors pay the PA's salary bill, few expect a new intifada.

只要外国继续为巴权力机构的薪水买单，希望发动新暴动的人便寥寥无几。