Some important pyrazine flavors and their characteristic aromas and the general synthetic methods of pyrazines have been reviewed.

介绍了一些重要的吡嗪类杂环香料及各自的特征香气,并综述了此类化合物的一般合成法。

As the isocyan group is polymerized further, diphenyl carbondiimine may be formed, further polymerization of which forms a nitrogen-containing polycyclic aromatic compound.

异氰基化合物进一步二成二苯基碳化二亚胺，后合生成杂环的环芳烃。

Among of them, indoles and pyrazoles are of great importance and they are also hotspots that organic chemists are researching.

吲哚和吡唑有机杂环化合物的两大类型，它们也有机化学家研究的热点问题。

The synthsis methods of N-sulfuryl substitude hetercycles by the reaction of alkyne with sulfamide catalyzed by diverse transition mentals were reviewed in this paper.

概述了不同过渡金属催化下通过炔基和磺酰胺基反应,形成N-磺酰基取代的杂环化合物。

Used AgNO3 Standard solution to measure the content of mercapto heterogeneous ring compound and thioureido derivative in acid coppering gloss agent continuously by potentiometric titration.

以硝酸银标准溶液，采用电位滴定法，连续测定酸性镀铜光充剂中的巯基杂环化合物和硫脲衍生物的量。

Moreover, we found that N-heterocyclic carbene (NHC) could served as an efficient and novel catalyst for the reactions of aziridines with silylated nucleophiles or acid anhydrides.

随后，我们发现杂环卡宾也可以作为一种有机小分子催化剂，分别催化各类硅试剂或酸酐对杂环丙烷化合物的开环。