3724. 1,2-Ethanedisulfonic Acid

Nomenclature

CAS number: 110-04-3
1,2-Ethylenedisulfonic acid.
C2H6O6S2; mol wt 190.20.
C 12.63%, H 3.18%, O 50.47%, S 33.72%.

Description and references

Prepn from 1,2-dibromoethane and sodium sulfite via disodium salt: McElvain et al., J. Am. Chem. Soc. 67, 1578 (1945) DOI; Ohba et al., US 3022172 (1962 to Fuji Photo Film). Review of prepns: Suter, Organic Chemistry of Sulfur (Wiley, New York, 1944) p 166; Gilbert, Sulfonation and Related Reactions (Interscience, New York, 1965).

Chemical structure

Derivative

Dihydrate.

Nomenclature

CAS number: 5982-56-9
C2H6O6S2.2H2O; mol wt 226.23.
C 10.62%, H 4.46%, O 56.58%, S 28.35%.

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.

Derivative

Sodium salt dihydrate.

Nomenclature

CAS number: 5982-57-0
C2H4Na2O6S2.2H2O; mol wt 270.19.
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.