[Na+].[Na+].[CH2:3]([S:9]([O-:12])(=[O:11])=[O:10])[CH2:4][S:5]([O-:8])(=[O:7])=[O:6]>O>[CH2:3]([S:9]([OH:12])(=[O:11])=[O:10])[CH2:4][S:5]([OH:8])(=[O:7])=[O:6]A solution of 3 g of 1,2-ethanedisulphonic acid disodium salt in 10 ml of water is introduced slowly into 200 ml of Dowex® 50 W×8 resin, and the product is eluted with 200 ml of demineralized water. The eluate is diluted by adding EtOH and concentrated under vacuum. 3.35 g of the expected product are obtained in the form of an oil which crystallizes at RT.
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