Picoline is the by-product in the preparation of diphenylamine with aniline.

甲是胺连续缩合合成二胺的副产物。

Diphenylbenzidine was synthesized by diphenylamine using glacial acetic acid and water as solvent in acidic condition.

以二胺为料,水和冰醋酸为溶剂,在酸性条件下一步合成二二胺,该方法具有操作简单,料易得等优点。