四嗪

The addition reaction of diazo pyrazoles and isocyanate has been investigated and the mechanism of this reaction has been guessed.

研究了重氮基吡唑同异氰酸酯的环加成反应，初步推测了该反应的机理。利用此反应设计了一类可能具有生物活性的吡唑骈[5，1-d][1，2，3，5]四嗪-4-酮类衍生物。

Study on the Synthesis of Uracil Derivatives Ⅱ.Study on the Synthesis of 1, 4-Dihydro-s-Tetrazine Derivatives and Their Antitumor Activity

论文标题：Ⅰ。药物中间体尿嘧啶衍生物合成研究Ⅱ。1，4-二氢-s-四嗪衍生物的合成及抗肿瘤活性研究

In part two, the synthesis of tetrazine and its derivatives, the corresponding antitumor activities were also studied.

第二部分：研究有关四嗪类衍生物的合成，并考察其抗肿瘤活性。

The relationship between molecular structures and application properties of tetrazine dyes used for liquid crystal colour display is investigated .

对均四嗪衍生物作为液晶彩色显示用染料结构和应用性能的关系进行了研究。

The accurate heat of formation 1088 kJ?mol^(-1) of DAT in gas phase was obtained via designed isodesmic reaction in which the tetrazine ring and the azide group have been kept.

在不破坏四嗪环和迭氮基的原则下通过构建等键反应求得了DAT的精确生成热为1088kJ？

The accurate heat of formation 1088 kJ·mol－1 of DAT in gas phase was obtained via designed isodesmic reaction in which the tetrazine ring and the azide group have been kept.

在不破坏四嗪环和叠氮基的原则下通过构建等键反应求得了DAT的精确生成热为1088 kJ·mol—1。

The conclusion was drawn that the tetrazine ring and amino group in the DAAT structure were in a plane and were able to build a conjugated π-bond, the calculated fre-quency and intensity were consistent with the experimental values in IR spectra, all thermal energy, thermal capacity and entropy would increase with the increase of temperature.

结果表明： DAAT分子结构中偶氮基两侧的四嗪环和氨基基本在同一个平面上，形成一个大的共轭π键；红外谱计算频率和强度与实验结果整体吻合较好；热能、热容和熵均随温度的升高而增大。

The thermal decomposition trajectories of s- tetrazine molecule and its five derivatives were simulated by ab initio molecular dynamics method to acquire the possible decomposition pathways and identify their relative importance.

采用从头算分子动力学方法，对均四嗪分子及其5种衍生物分子的热分解轨迹进行了模拟，获得了它们的各种热分解途径及其难易程度。

The first singlet vertical excitation energy 2.227 eV of the monomer s -tetrazine and the T-W n clusters have been investigated by time-dependent density functional theory.

同时， 用含时密度泛函理论方法在TD-B3LYP/6-31＋＋G**水平计算了 s -四嗪单体及其氢键复合物的第一1激发态的垂直激发能。

3,6-Bis(1 H -1,2,3,4-tetrazol-5-yl-amino)-1,2,4,5-tetrazine was synthesized by triamino- guanidinium nitrate with 2,4-pentanedione of condensation, followed by oxidation and substitution reaction. The product was characterized by elemental analysis, IR, NMR and DSC.

以三氨基胍硝酸盐、戊二酮为起始原料，经缩合、氧化、取代等反应合成了3，6-双(1 H -1，2，3，4-四唑-5-氨基)-1，2，4，5-四嗪，并通过元素分析、红外、核磁、差示扫描量热法等分析手段对其进行了表征。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。