Synthesis and Thermolysis of 2<i>H</i>-1,2,3-Benzothiadiazine 1,1-Dioxide and 2,1-Benzoxathiin-3-one 1,1-Dioxide

Abstract

2H-1,2,3-Benzothiadiazine 1,1-dioxide (6) and 2,l-benzoxathiin-3-one 1,1-dioxide (5), representatives of little-known heterocyclic systems, have been synthesized from sodium o-formylbenzenesulfonate (7). Thermolysis of 5 and 6 was investigated in the hope of finding evidence for the formation of a sulfene. No characterized product was obtained from 5, but 6 gave the sultine 3H-2,1-benzoxathiole 1-oxide (21), the compound expected from the sulfene 20.