1071. Benzenesulfonic Anhydride

Nomenclature

CAS number: 512-35-6
Benzenesulfonic acid 1,1′-anhydride.
C12H10O5S2; mol wt 298.33.
C 48.31%, H 3.38%, O 26.81%, S 21.50%.

Description and references

Prepd by heating benzenesulfonic acid with excess phosphorus pentoxide mixed with inert support: Field, J. Am. Chem. Soc. 74, 394 (1952).

Chemical structure

Properties

Light tan solid, mp 60-85° (softens about 55°); may be recrystallized from ether, mp 88-91° (softens about 75°). Liquefies upon exposure to air for 2.5 hrs. Explosion occurs when mixed with 90-95% H2O2.

Use

In Friedel-Crafts sulfone synthesis; in other sulfonylation reactions.