Sulfuric Acid → HCID 73663468, compound

Participants

Reaction Steps

345 parts of the dry 2-(2-benzylidenehydrazino)-4-(2-hydroxyethylsulfonyl)-benzenesulfonic acid are added to 1000 parts of sulfuric acid (monohydrate); after quantitative esterification (after 10 h) the mixture is added to 2500 parts of ice. 2-(2-Benzylidenehydrazino)-4-(2-sulfoethylsulfonyl)-benzenesulfonic acid can then be isolated therefrom by precipitation with sodium chloride or be obtained as an aqueous neutral solution by bringing this acid solution to a pH of 5 with 900 parts of calcium carbonate and about 100 parts of sodium carbonate and at 60° C. filtering off the calcium sulfate with suction.

Provenance & Evidence