1,2-Ethanedisulfonic Acid
Title: 1,2-Ethanedisulfonic Acid
CAS Registry Number: 110-04-3
Additional Names: 1,2-Ethylenedisulfonic acid
Molecular Formula: C2H6O6S2
Molecular Weight: 190.20
Percent Composition: C 12.63%, H 3.18%, O 50.47%, S 33.72%
Line Formula: HO3SCH2CH2SO3H
Literature References: Preparation of disodium salt from 1,2-dibromoethane and sodium sulfite: McElvain et al., J. Am. Chem. Soc. 67, 1578 (1945); Ohba et al., US 3022172 (1962 to Fuji Photo Film). Free acid obtained by conversion of disodium salt to barium salt followed by liberation with H2SO4: McElvain et al., loc. cit. Review of prepns: Suter, Organic Chemistry of Sulfur (Wiley, New York, 1944) p 166; Gilbert, Sulfonation and Related Reactions (Interscience, New York, 1965).
Derivative Type: Dihydrate
Properties: Crystals from acetic acid + acetic anhydride, mp 111-112°. Heating at 145° and 1 mm for 6 hours gives anhydr compd, mp 172-174°. Somewhat soluble in anhydr ether, very sol in dioxane.
Melting point: mp 111-112°; mp 172-174°
Derivative Type: Sodium salt dihydrate
Molecular Formula: C2H4Na2O6S2.2H2O
Molecular Weight: 270.19
Percent Composition: C 8.89%, H 2.98%, Na 17.02%, O 47.37%, S 23.74%
Properties: Monoclinic prisms. Not very readily sol in water. Practically insol in alcohol.
Use: Base in hypnotics, sedatives.

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