The influence of structured solids (amorphous, lamellar and 3D crystalline) on the regioselectivity dibromination naphthalene using bromine at room temperature has been investigated. more acidic amorphous catalysts an clay give rapid reactions lead to a large preponderance 1,4-dibromonaphthalene over 1,5-dibromo compound, while calcined KSF clay, bentonite material, after short reaction time gi...