In Friedel-Crafts sulfone synthesis; in other sulfonylation reactions.
synthetische
Benzenesulfonic anhydride is prepared on a large scale by heating benzenesulfonic acid with excess phosphorus pentoxide mixed with an inert support. An inert support of 1:1 Supercel kieselguhr and Gooch asbestos was mixed with phosphorus pentoxide and slowly added to benzenesulfonic acid, first at rt then heating to 100 °C. The resultant mixture was heated at 100 °C for 5 h, 1,2-dichloroethane was added, and the solution was refluxed for 10 min. After cooling and successive filtrations, benzenesulfonic anhydride was recovered in 70% yield.
l?uterung methode
Crystallise the anhydride from Et2O (m 88.5-91.5o), CHCl3 or chlorobenzene (m 90-92o). Store it dry. [Field J Am Chem Soc 74 394 1952, Beilstein 11 H 3, 11 I 11, 11 II 23, 11 III 50, 11 IV 50.]
BENZENESULFONIC ANHYDRIDE Upstream-Materialien And Downstream Produkte