查询词典 carbene

In chapter 3, we studied the syntheses and structures of the diazene-coordinated dimetal bridging carbene complexes.

在第三章中，我们对含有杂环配位的双金属桥卡宾络合物的合成进行了初步的研究。

The aim of this thesis researches and develops a novel approach of carbene promoted by samarium and its application in organic synthesis.

本论文的研究目的在于寻找和探索钐试剂促进卡宾的新方法及其在有机合成中应用。

As carbene has its particular reactive capability and enormous applied value, it is one of focus hotspots by researchers all along and it is an important task in organic synthesis.

卡宾由于其独特的反应性能和巨大的应用价值，一直是人们竟相关注的热点之一，也是有机合成方法学中的重要课题。

Moreover, an improved overall economy of the process could be achieved by using 4-methylthiazolium salts as carbene precursors.

同时，引入4-甲基噻唑盐作为卡宾前体，使整个反应的原子经济性得到了提高。

The chemistry of nucleophilic N-heterocyclic carbene has become a major area of research as organic catalyst in resent years.

具有强亲核性的N-杂环卡宾（N-heterocyclic carbenes， NHC）是近年来研究最为活跃的一类小分子有机催化剂。

And the bridging carbene complex can be converted to other bridging carbene complexes which have a different substituent on the bridging carbene carbon.

而且这种新型的络合物可以转化为在桥卡宾碳上带有不同取代基的桥卡宾络合物。

Platinum and rhodium catalyst are applied largely and widely, because these two kinds of catalysts are so efficient for hydrosilylation that they were researched since a long time ago. Very recently, N-heterocyclic carbene Pt and N-heterocyclic carbene Rh complexes were used as catalysts in hydrosilylation.

最近，铂和铑的卡宾金属配合物作为催化剂应用于各种不饱和化合物的硅氢加成反应，表现出非常优良的催化性能和稳定的物理化学性质，受到了化学工作者们广泛的关注。

A novel zwitterion derived from the addition of thiazole carbene to ketene was discovered and captured by an activated alkyne. In this process, we developed a facile and efficient three-component tandem reaction involving thiazole or benzothiazole carbene, disubstituted ketene and activated alkyne.

我们发现了一种新的噻唑卡宾和烯酮形成的两性离子的存在，并用活泼炔成功捕捉，从而发展了一个新的噻唑卡宾或苯并噻唑卡宾、二取代烯酮和活泼炔的三组分串联反应。

Pyrazolyl alkenyl Fischer carbene complexes have both the virtues of multiple reactivity in carbene fragment and high bioactivity in pyrazole fragment, which attracts our interest in their synthesis and application from a theoretical and applied viewpoint.

吡唑基烯基卡宾化合物同时具有高反应活性的卡宾基团和高生物活性的吡唑基团，因而其反应研究具有一定的理论意义和应用价值。

In the thesis a series ofβ-pyrazolyl-α,β-unsaturated Fischer carbene complexes were synthesized and structurally characterized by NMR, IR and X-ray crystallographic determinations. Based on the dynamic nuclear magnetic resonance and density functional calculation results, a three-step mechanism is proposed for the Michael type addition of pyrazoles to the alkynyl carbene complexes.

本论文合成了一系列β-吡唑基烯基卡宾化合物，并运用核磁共振动力学实验和密度泛函理论计算方法对Michael加成反应的机理及反应速率的影响因素进行了深入探讨。

For a big chunk of credit-card losses; the number of filings (and thus charge-off rates) would be rising again, whether

年美国个人破产法的一个改动使得破产登记急速下降，而后引起了信用卡大规模的亏损。

Eph. 4:23 And that you be renewed in the spirit of your mind

弗四23 而在你们心思的灵里得以更新