Phase Transfer Catalyzed Reduction of Nitrotoluenes by Aqueous Ammonium Sulfide: Kinetic Study

Abstract

The reduction of nitrotoluenes (o-, m- and p-) using aqueous ammonium sulfide as the reducing agent was carried out in an organic solvent, toluene, under liquid-liquid mode with phase transfer catalyst (PTC), tetrabutylammonium bromide (TBAB). The selectivity of toluidines was found to be 100%. The reaction rate of m-nitrotoluene was found to be highest among the three nitrotoluenes followed by p- and o-nitrotoluene. The effects of different parameters such as speed of agitation, catalyst concentration, sulfide concentration, concentration of nitrotoluene, and temperature on the reaction rate and conversion were studied. The rate of reaction of nitrotoluene was found to be proportional to the concentration of catalyst, to the square of the concentration sulfide, and to the cube of the concentration of nitrotoluene. The apparent activation energy for this kinetically controlled reaction was estimated as 19.43, 21.45 and 25.54 kcal/mol for ONT, PNT and MNT, respectively.