1. Among of them, indoles and pyrazoles are of great importance and they are also hotspots that organic chemists are researching.
   吲哚和吡唑是含氮有机杂环化合物的两大类型，它们也是有机化学家研究的热点问题。
2. The pyrazoles ramification containing dithioether is synthesized by one-step method and characterized by H-NMR, IR and UV-Vis spectra.
   并采用氢核磁共振，红外光谱和紫外吸收光谱等手段进行了表征。
3. A planar tetradentate dinuclear ligand, 3, 5-bis(2-pyridyl) pyrazole, was synthesized by a three-step reaction of esterification, condensation and addition.
   以2-吡啶甲酸为原料，经酯化、缩合、加成合成了平面四齿双核配体3，5-二（2-吡啶基）吡唑。

声明：以上例句、词性分类均由互联网资源自动生成，未经过人工审核，其表达内容亦不代表本软件的观点；若发现问题，欢迎向我们指正。