查询词典 dicarboxylic

Polyesters are produced by a condensation reaction of a diol, such as ethylene glycol, with a dicarboxylic acid.

聚酯是由一缩合一二醇，例如乙二醇，以二元酸。

The functional groups which are placed at 4-position of pyridine-2,6-dicarboxylic acid can effect the electron cloud of the lanthanide complexes.

吡啶-2，6-二甲酸的4位取代官能团能影响配合物的电子云形状，配合物的荧光性能和电子能量传递密切相关。

Leading industries of biological, chemical and nano-materials, the main products have erythritol, glucose, sodium, soy oligosaccharide-peptide, refined clothing acid, itaconic anhydride, kojic acid, kojic acid derivatives, arbutin, Calcium Citrate , sodium citrate, Apple sodium, potassium citrate, nano zirconia, long-chain dicarboxylic acid, and efficient water treatment agent non-phosphorus.

主导产业为生物化工和纳米材料，主要产品有赤藓糖醇、葡萄糖酸钠、大豆低聚肽、精制衣康酸、衣康酸酐、曲酸、曲酸衍生物、熊果苷、柠檬酸钙、柠檬酸钠、苹果酸钠、柠檬酸钾、纳米氧化锆、长链二元酸、高效无磷水处理剂。

A catalyst composition for the polymerization of propylene comprising one or more Ziegler-Natta procatalyst compositions comprising one or more transition metal compounds and one or more esters of aromatic dicarboxylic acid internal electron donors; one or more aluminum containing cocatalysts; a selectivity control agent comprising at least one silicon containing compound containing at least one C1-10 alkoxy group bonded to a silicon atom, and one or more activity limiting agent compounds comprising one or more aliphatic or cycloaliphatic carboxylic acids; alkyl-, cycloalkyl- or alkyl-ester derivatives thereof; or inertly substituted derivatives of the foregoing.

一种用于丙烯聚合的催化剂组合物，所述催化剂组合物包括：一种或多种齐格勒-纳塔主催化剂组合物，该主催化剂组合物包括一种或多种过渡金属化合物和一种或多种芳族二羧酸酯内部电子给体；一种或多种包含铝的助催化剂；选择性控制剂，该选择性控制剂包括至少一种包含硅的化合物，该化合物包括至少一种与硅原子连接的C 1-10 烷氧基；和一种或多种活性限制剂化合物，该活性限制剂包括一种或多种脂族或脂环族的单或聚羧酸类、其烷基-、环烷基-或烷基-衍生物、或上述惰性取代的衍生物。

Cantharidin(exo,exo-2,3-Dimethyl-7-oxabicyclo[2,2,1]heptane-2,3-dicar- boxylic anhydride ) is an active principle of Lytta caragarae, Mylabris Phalerata and Epicauta gorhami, and exists in various other insect species.

中文摘要斑蝥素( Cantharidin； exo，exo-2，3-Dimethyl-7-oxabicyclo [2，2，1]heptane- 2，3-dicarboxylic anhydride )是一个来自昆虫的天然物。

And electrocarboxylation was carried out in the presence of CO2. The global yield and the ratio of mono- to dicarboxylic acids were strongly affected by various factors: electrode material, electrolysis potential, the substrate concentration and temperature.

而在CO2氛围下，可以实现相应的电羧化反应，反应的总产率和选择性受各个反应条件的影响，例如电极材料、电解电位、底物浓度和反应温度。

According to the weight percent, the copolymer composition comprises: 25 percent to 99 percent of the vinyl aromatic monomer; 0 percent to 30 percent of the en-unsaturated nitrile monomer; 1 percent to 50 percent ene dicarboxylic acid derivative monomer.

这种共聚组合物按重量百分比包含：25至99％的乙烯基芳香族单体；0至30％的烯属不饱和腈类单体；1至50％的烯属二元酸衍生物单体。

Oxalic acid 2 , is the first of the series of dicarboxylic acids.

草酸 2 ，是该系列的二元酸。

The optimum condition of spectrofluorimetric determination of uranyl ion in pyridine 2,6 dicarboxylic acid β cydodextrin system is studied.

研究了吡啶 2 ，6 二羧酸β环状糊精体系荧光分光光度法测定铀酰离子的最佳条件以及某些稀土共存离子对荧光体系的干扰，并应用于人工样品的测定。

Furthermore, through molecular structural design, we have also synthesized stable dual functional diphenylether polymer intermediates of ABB' types possessing ortho-dicarboxylic at one aromatic ring and diamine groups at another beginning from Xylenol and 1-Chloro-3,4-dinitrobenzene as the raw materials.

中文摘要本研究应用自氧化法与氢化法两反应，成功而有劾地制备出芳香族含酸酐及二胺基之官能基单体，并进一步经由分子结构设计，从3，4-二甲苯酚及1-氯-3，4-二硝基苯为原料，转化合成出安定性高带有羧基与双胺基双官能基之堑新ABB'型二苯醚中间体，并成功地应用此中间体从事自聚合反应，而合成分歧状聚醚亚醯胺高分子。

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。