Mohammad Ali Zolfigol - Faculty of Chemistry, College of Science, University of Bu-Ali Sina
Gholamabbas Chehardoli - School of Pharmacy, Hamedan University of Medical Sciences,
Enayatollah Mottaghinejad - Islamic Azad University, Shahre Rey branch, Shahre Rey, Iran
Seyedeh Bahareh Azimi - Islamic Azad University, Shahre Rey branch, Shahre Rey, Iran

Nitrophenols can be obtained in moderate to high yields via nitrosation-oxidation of phenols with titania sulfuric acid, NaNO2 and wet SiO2 at room temperature. In situ generation of HNO2 and a radical cation mechanism via the nitrous acid catalyzed (NAC) pathway appear to be applicable to phenol nitration using these reagents.

Titania sulfuric acid, nitrosation-oxidation, nitration, nitrophenols