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-啶甲酸为原料，经酯化、缩合、加成合成了平面四齿体3，5-二（2-啶基）。

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

哚和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。