Nano silica chromic acid/wet SiO2 and NaNO2 as an efficient reagent system for synthesis of azo dyes based on 1-naphthol at room temperature and solvent-free conditions

Authors

• Abdolhamid Bamoniri ¹
• Bi Bi Fatemeh Mirjalili ²
• Arash Ghorbani-Choghamarani ³
• Mohammad E. Yazdanshenas ⁴
• Abbas Shayanfar ^{4, 5}
• Ahmad Akbari ⁵

1. Department of Organic Chemistry, Faculty of Chemistry, University of Kashan, Kashan, Iran
2. Department of Chemistry, College of Science, Yazd University, Yazd, P.O. Box 89195-741, Iran
3. Department of Chemistry, Faculty of Science, Ilam University, Ilam, I. R. Iran
4. Department of Textile,Faculty of Higher Education,Islamic Azad University,Tehran, I. R. Iran
5. Nanoscince and Nanotechnology Institute, University of Kashan, Kashan, I. R. Iran

Abstract

A convenient, rapid, and one-pot method for the synthesis of azo dyes has been developed. In this protocol, diazotization reagent (ArN₂⁺ -CrO₃–SiO₂) was prepared via grinding of aromatic amines, NaNO₂, wet SiO₂ and nano silica chromic acid (Nano-SCA) without solvent at room temperature. The obtained diazotization reagent was sufficiently stable to be kept at room temperature in the dry state for long time. Azo dyes were prepared by coupling of ArN₂⁺ -CrO₃–SiO₂ with 1-naphthoxide in good to excellent yields. Mild and heterogeneous reaction conditions, high stability of diazonium salt, easy procedure, short reaction time and high yields are some important advantages of this protocol.

Keywords

• Azo Dyes
• Nano silica chromic acid
• 1-Naphthol
• Solvent-free condition
• Diazonium salt.