查询词典 anhydride

All compounds are synthesized starting from the acylation reaction of gallic acid with L-glutamine to form the basic scaffold, followed by the cyclic reaction in acetic anhydride and the key intermediate cyclic anhydride (compound 4) was obtained. The intermediate compound is condensed with different amino acids or primary amines, and produces the target compounds.

本研究以L－谷氨酸为基本骨架，与甲醚化保护的没食子酸缩合后，经过酰化、环合反应得到关键中间体环状酸酐（化合物4），再经胺解反应合成目标化合物，其化学结构经过红外光谱、电喷雾质谱和核磁共振谱（氢谱、碳谱、碳氢异核多键相关谱）确证。

Using completely PVD method, successively depositing doffing pellicle twain anhydride and diamine on the polishing glass substrate in the high vacuum environment, and then processing heat treatment in proper surrounding temperature., make sure twain anhydride and diamine form polymeric amic acid, and more ring-imidization.

采用全物理气相沉积方法，在高真空环境中将脱膜剂、二酐和二胺先后沉积于抛光的玻璃衬底上，然后在适当的环境温度中进行热处理，使二酐和二胺形成聚胺酸，并进一步环亚胺化。

In this paper, vapor-liquid equilibrium data for the two binary systems maleic anhydride + di-isobutyl hexahydrophthalate and maleic anhydride + di-n-butyl phthalate at different feed compositions at low pressures were measured with a small modified ebulliometer.

本文用改进型沸点仪测定了低压条件下，顺酐和六氢化邻苯二甲酸二异丁酯以及顺酐和邻苯二甲酸二丁酯两个二元系统在不同配料组成下的平衡温度、平衡压力数据。

At present the output of maleic anhydride and fumaric acid is 80000 tons per year. It is one of the biggest factories fo maleic anhydride in Asia.

公司目前年产顺酐、富马酸8万吨，是亚洲地区最大的顺酐生产厂家之一。

The company has paid much attention to production, development and application of maleic anhydride and fumaric acid all the time and application of maleic anhydride and fumaric acid all the time and gathered plenty of talent who are good at technology and management with rich industrial work experience for many years.

长期以来，公司专注于顺酐、富马酸及下游产品的科研、生产、应用和销售，汇聚了一批优秀的科技人才和管理精英。

The calculated results show that Itaconic Anhydride is active to get electron,and oxygen atom in the acid anhydride group is the electrophonic reaction site.

计算结果表明：衣康酸酐分子容易得到电子，且酸酐氧基上氧原子是亲电反应的作用点。

Amino to acetyl phenol, in have technology of two kinds of production domestic and internationally, acetic anhydride craft of the United States, acyl changes temperature to have 75 ℃ only, acyl changes mother liquor not apply mechanically, deputy reaction is little, of production thick tasting is kind of white almost, purificatory craft is very simple, activated carbon dosage only 2~3%, the Kun that its product does not have glow material almost in different third alcohol inferior the sealed impurity of amine impurity and minim, settleclear lightness it may not be a bad idea, the product quality that acetic anhydride craft produces is good, but close rate low, cost is high.

对乙酰氨基酚，在国内外有两种生产工艺，美国的醋酐工艺，酰化温度只有75℃，酰化母液不套用，副反应少，生产的粗品几乎是类白色，精制工艺就非常简单，活性炭用量仅2~3%，其产品在异丙醇中几乎无红光物质的醌亚胺杂质及微量的未知杂质，澄明度也好，醋酐工艺生产的产品质量好，但收率低、成本高。

The hemisuccination process and kinetics ofβ-sitosterol and stigmasterol with succinic anhydride The reaction product ofβ-sitosterol and stigmasterol with succinic anhydride were characterized by elemental analysis,~1H NMR and ~(13)C NMR.

应用高效液相色谱对混合植物甾醇琥珀酸酯化产物中各组分的含量进行了分析测定。实验结果表明，各种植物甾醇琥珀酸单酯的分离效果较好，响应时间在10min左右，面积归一法能够快速准确地用于该过程的分析测试。

The ungrafted maleic anhydride existed in the form of polymaleic anhydride in the reaction system .

未接枝的马来酸酐大部分以聚马来酸酐的形式存在于反应体系中。

The selective behavior on the hydrogenation of maleic anhydride to succinic anhydride and γ-butyrolactone has been investigated by RuCl〓/PPh〓 catalytic system.

以RuCl〓／PPh〓为催化剂体系，考察了反应条件对顺酐均相加氢生成琥珀酸酐和γ-丁内酯的选择性影响。

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。