Alumina as an Efficient Catalyst for the Preparation of Sulfonyl Hydrazides and Sulfonyl Semicarbazides Under Solvent-free Conditions

Sulfonyl hydrazide and sulfonyl semicarbazide derivatives exhibit variety of bactriostatic activity and also are important compounds as blowing agents in cellular rubber and plastics. Different methods for the preparation of these compounds are reported for example, sulfonyl semicarbazides are prepared by reaction of a sul- fonyl hydrazides with urea or cyanic acid , reaction of sulfinic acid salt with azodicarbonamide in water, and reaction of sulfonyl chloride and semicarbazide. In lots of these methods the yields are not high, the solvents are toxic （pyridine） and also the starting materials are not commericaly available. We now report a modified and convenient procedure for the preparation of these compounds under solvent-free condition.

Alumina as an Efficient Catalyst for the Preparation of Sulfonyl Hydrazides and Sulfonyl Semicarbazides Under Solvent-free Conditions