Note on the Synthesis of 1,2‐Benzoxathiine 2,2‐Dioxide Derivatives from 3‐Chromonesulfonic Acid
Starting with 3‐chromonesulfonic acid (1) the 1,2‐benzoxathiine 2,2‐dioxide derivatives 7 and 8 have been obtained by ring transformation of the sulfonyl chloride 4.