Nano Silica/ HIO4 as a Green and Reusable Catalyst for Synthesis of 2-Naphthol Azo Dyes under Grinding Conditions

Document Type : Research Paper


1 Department of Organic Chemistry, Faculty of Chemistry, University of Kashan, Kashan, I.R.Iran

2 School of Chemistry, Damghan University, Damghan, I.R.Iran


Nanosilica periodic acid (nano-SPIA) is found to be a new, powerful, and reusable heterogeneous catalyst for the rapid synthesis of 2-naphtholazo dyes via diazotization of aromatic amines and followsazo coupling with 2-naphthol under solvent-free conditions at room temperature by grinding. Eco-friendly, heterogeneous reaction conditions, high stability of diazonium salt, simple experimental procedures, and high yields are some of the important advantages of this method.