1070. Benzenesulfonic Acid

Nomenclature

CAS number: 98-11-3
C6H6O3S; mol wt 158.18.
C 45.56%, H 3.82%, O 30.34%, S 20.27%.

Description and references

Made by treating benzene with fuming H2SO4: Gattermann-Wieland, Praxis des Organischen Chemikers (de Gruyter, Berlin, 40th ed., 1961) p 168.

Chemical structure

Derivative

Sesquihydrate.

Nomenclature

CAS number: 5928-72-3
C6H6O3S.1H2O; mol wt 167.18.
C 43.11%, H 4.22%, O 33.50%, S 19.18%.

Properties

Deliquescent plates, tablets, mp 43-44°. When anhydrous mp 50-51°, also reported as mp 65-66°. pKa (25°): 0.699. Freely sol in water, alc; slightly sol in benzene; insol in ether, carbon disulfide. Keep well closed.

Derivative

Ethyl ester.

Nomenclature

CAS number: 515-46-8
Ethyl benzenesulfonate.
C8H10O3S; mol wt 186.23.
C 51.60%, H 5.41%, O 25.77%, S 17.22%.

Properties

Colorless to slightly yellow, almost odorless liq. bp15 156°. d417 1.219. Slightly sol in water; misc with alc, benzene, chloroform, ether.

Derivative

Sodium salt.

Nomenclature

CAS number: 515-42-4
Sodium benzenesulfonate; sodium benzosulfonate.
C6H5NaO3S; mol wt 180.16.
C 40.00%, H 2.80%, Na 12.76%, O 26.64%, S 17.80%.

Properties

Crystals. Sol in water.

Caution

Highly irritant to skin, eyes, mucous membranes.

Use

Manuf phenol by fusion with NaOH.