查询词典 diketone

The results show that the new β-diketone compound exists in the chloroform in chloroform solvent.

这种β-二酮化合物在氯仿溶液中主要以烯醇形式存在。

B synthesis of β- diketone based side chain liquid crystalline random copolyphenylsisesquioxane and its metal complex.

此类β-二酮可作为高分子液晶中的介晶基元，并具有和大多数过渡金属离子形成络合物的能力。

The thermostability of β- diketone was characterized, the result showed that it was an excellent nontoxic auxiliary heat stabilizer for PVC.

结果表明：β-二酮是一种优良的PVC用无毒辅助热稳定剂。

The results showed that compared with the other two methods, GC method could separate penta diketone and diacetyl successfully and measure the true diacetyl content, besides, it had good repeatability and low detection range and high recovery, which was suitable for higher requirements.

结果表明，气相色谱法与其他两者相比，其能将戊二酮和双乙酰分离，能得到真正双乙酰的浓度，且重复性好，检测范围低，回收率高，可适合检测要求较高的场合。

In this paper, on the basis of predecessor research,β-diketone derivative ligand, Pyrazolyl ligand and their eight transition metal complexes were synthesized.

本论文是在前人研究的基础上选择合成并表征了一种β-二酮类配体和一种多吡唑类配体及其八个过渡金属配合物，并解析了它们的单晶结构，进行了元素分析、红外光谱、紫外光谱等表征，并研究了它们的发光性能和热稳定性能。

In addtion, the β-diketone compound of Ti is complexed with late transition metal Co, Ni complex to furtherly modify the catalytic ability of the catalyst system.

利用配位配体来调节催化剂的催化性能是烯烃聚合催化剂设计和合成的基本思路和重要途径之一，是开发新型功能性聚烯烃材料的重要方法。

Novel synthetic methods for alkyl methyl ketone, symmetric diketone , long-chain diketone and macrocyclic ketone were provided.

利用二苯并咪唑盐与格利雅试剂的加成-水解反应，提出了长链二酮的新合成方法。

As a preliminary work we prepared bisorganozinc halides directly from diiodide and zinc powder, and investigated their reaction with acyl chloride to give diketone, the reaction mechanism also proposed on the basis of experiments and the literatures.

第三章：带官能团的双有机卤化锌试剂和酰氯的反应研究本章首次探讨了带官能团的双有机卤化锌试剂的制备及其与芳香族酰氯的反应研究。

Diketoreductase is a new class of enzyme, and compared to other oxidoreductase, the unique property is that it can be reduced diketone substrate to corresponding dihydroxy alcohol with high stereoselectivity.

双羰基还原酶（Diketoreductase，DKR）是一类全新的酶，与其他的氧化还原酶相比，其独特之处在于它能够同时还原两个羰基还原成羟基，并有高度的立体选择性。

At first by reaction of TiCl〓 with β-diketone (acac: acetylacetone, facac: 1, 1, 1-trifluoroacetylacetone) ligand to yield two kinds of Ti (β-diketone)〓Cl〓, then they are complexed proportionally with Co 〓 or Ni 〓 through different method to get two-metal catalyst precursors.

另外采用具有不同性能两种或多种金属催化剂复合制得催化剂，使其具有多活性中心的综合性能，发挥各金属活性中心的协同作用，已经在聚烯烃的研究工作中深入开展。

The concept of equivalent rotationally rigidity is offered and the formula of rotationally rigidity is obtained.

主要做了如下几个方面的工作：对伸臂位于顶部的单层框架—筒体模型进行分析，提出了等效转动约束的概念和转动约束刚度的表达式。

Male cats normally do not need aftercare with the exception of the night after the anesthetic.

男猫通常不需要善后除了晚上的麻醉。