Title: Benzenesulfonic Anhydride
CAS Registry Number: 512-35-6
Molecular Formula: C12H10O5S2
Molecular Weight: 298.33
Percent Composition: C 48.31%, H 3.38%, O 26.81%, S 21.50%
Line Formula: (C6H5SO2)2O
Literature References: Prepd by heating benzenesulfonic acid with excess phosphorus pentoxide mixed with inert support: Field, J. Am. Chem. Soc. 74, 394 (1952).
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.
Melting point: mp 60-85° (softens about 55°); mp 88-91° (softens about 75°)
Use: In Friedel-Crafts sulfone synthesis; in other sulfonylation reactions.