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

甲基吡啶是苯缩二苯的副产物。

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

以二苯为料,水和冰醋酸为溶剂,在酸性条件下一二苯基联苯二,该方法具有操作简单,料易得等优点。