Thermal and kinetic studies on the stability of some ureido-sulfonamide derivatives

The kinetic and thermal behaviour of the following compounds: [GRAPHICS] where R=3,4-dichlorophenyl, phenyl, cyclohexyl; n=0, 1, 2 were studied by T G and DTA techniques. The compounds decompose in many steps; the last one corresponding to the bu rning of H2N-S-C6H4-C6H4-S-NH2 occurs with comparable reaction rates.