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To a 500 ml. round bottom flask equipped with condenser, thermometer and a stirrer were introduced 118 g. (1.0 mole) of 4,5-dihydrothiophene 1,1-dioxide, 200 ml. of 70% by weight aqueous ethanol and 30 g. (0.5 mole) of 1,2-diaminoethane (ethylenediamine). The reaction mixture was heated at reflux (80°-85°C) for 4 hours. The solvent was then removed under a reduced pressure. The product, N,N'-bis(1,1-dioxotetrahydro-3-thienyl)-1,2-diaminoethane, obtained was a viscous liquid that became a solid, m.p. 60°-85°C. IR spectrum showed absorptions at 3300 cm-1 (NH), at 1300 cm-1 and 1140 cm-1 (SO2).

1. customround bottom flask equipped with condenser
2. additionthermometer and a stirrer were introduced 118 g
3. temperatureThe reaction mixture was heated
4. temperatureat reflux (80°-85°C) for 4 hours
5. customThe solvent was then removed under a reduced pressure