卡宾

For the synthesis of NHC precursors, there are also several routes: condensation of glyoxal, amines and paraformaldehyde; alkylation of imidazole or monosubstituted imidazole with alkyl halide; annulation of ortho esters and 1,2-diamines; ring closure of hydrazines or amides with acetic anhydride; reduction of thiones with Na/K in THF.

关于N-杂环卡宾前体的合成途径主要有：乙二醛、伯胺和多聚甲醛的缩合反应；卤代烷与咪唑及其取代咪唑的烷基化反应；原甲酸酯与1，2-二胺的成环反应；肼或酰胺与酸酐的环化反应；用Na/K对环硫脲化合物的还原反应。

Well ,I gotta tell you .I'd be very very careful about who you talk to because the person who wrote that …is very dangerous ,and this button-down ,oxford-cloth,phycho might just snap and then stalk from office to office with an Armalite AR-10 carbine gas-powered,semi-automaticweapon pumping around into colleagues and co-workers.

好吧，我来告诉你，如果我是你的话，我会非常非常小心现在和你说话的那个人，因为写下这些的人…是非常非常危险的。这个衣冠楚楚的疯子很有可能突然癫狂起来，昂首阔步的拿卡宾半自动步枪堆着办公室里的同时狂扫起来。

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。

The metal catalyst complex has an N-heterocyclic carbene ligand, and thus, is excellent in thermal stability and reactivity.

所述金属催化剂配合物含有N-杂环卡宾配位体，因此，其具有极好的热稳定性和反应性。

In the chapter four,the main study was focused on [60,70]fullerene reaction with 4,4,5,5-tetramethylidazoline- 2- thione and DL- valine and other α-aminoacids. The results ofcharacterization showed that it was a carbene reaction. The possible mechanism wasput forward based on the results of characterization.

第四章，主要研究了[60，70]富勒烯，4，4，5，5-四甲基咪唑啉-2-硫酮与DL-缬氨酸和其它氨基酸的反应，通过对反应产物的详细的表征，发现该类反应是一个产生卡宾的新反应。

The reaction mechanism of ozone and singlet carbene has been studied by means of the Gaussian-3 method to optimize the geometries of reactions, transition states, intermediates and products.

为了研究单态卡宾与臭氧反应机理，本文采用密度泛函理论Gaussian-3方法(G3B3)优化了反应物、中间体、过渡态和产物的几何构型。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。