The Hofmann rearrangement is an organic reaction used to convert a primary amide to a primary amine using a halogen, base, water, and heat. 6-Amino-2-cyanobenzothiazole Formula The reaction begins with deprotonation of the amide by the base to form an anion which then attacks the halogen to form a N-haloamide. Price of 1361220-22-5 A second deprotonation by the base provides an anion that rearranges to an isocyanate intermediate and releases a halide anion. The isocyanate is then attacked by water which after a series of proton transfer step results in a zwitterionic intermediate, containing an ammonium cation and a carboxylate anion. Thermal conditions result in the explosion of carbon dioxide gas and quenching of the ammonium cation to the amine product. ^[1]