How is 2-Hydrazinobenzenesulfonamide (CAS: 90824-33-2) typically synthesized?

2-Hydrazinobenzenesulfonamide (CAS: 90824-33-2) can be synthesized through a multi-step process involving the sulfonation of benzenesulfonamide followed by the hydrazination reaction. This typically requires the use of hydrazine and a catalyst such as palladium on carbon. The reaction is carried out in a solvent like methanol or ethanol, and the yield can be up to 90% when optimized. This synthesis is performed under mild conditions to ensure high selectivity and purity.