The preparation of ethylenesulfonic acid has been previously described. Kohler3i4f6* 6 prepared the compound by decomposition of ethanedisulfonyl chloride. Ethylenesulfonic acid has also been prepared by dehydrohalogenation of 2-haloethanesulfonic and by removal of sulfuric acid from ethionic acid. 5 In the course of this investigation, the preparation of ethylenesulfonic acid by the above methods has been reinvestigated, and ...