Preparation of 2-Aryl-2H-benzotriazoles by Zinc-Mediated Reductive Cyclization of o-Nitrophenylazophenols in Aqueous Media Without the Use of Organic Solvents.

Preparation of 2-Aryl-2H-benzotriazoles

Preparation of 2-Aryl-2H-benzotriazoles by Zinc-Mediated Reductive Cyclization of o-Nitrophenylazophenols in Aqueous Media without the Use of Organic Solvents

✍ Guo-Bin Liu; Hong-Yun Zhao; Hong-Jie Yang; Xiang Gao; Miao-Kui Li; Thies Thieman 📂 Article 📅 2007 🏛 John Wiley and Sons 🌐 English ⚖ 77 KB 👁 1 views

## Abstract Zinc powder‐mediated reductive cyclization of __o__‐nitrophenylazophenols in alkaline solution affords the corresponding 2‐aryl‐2__H__‐benzotriazoles in high yields under mild reaction conditions. __No organic solvents__ are used in the reaction and only minimal amounts in the work‐up.