2471-91-2

1,3-Dihydrobenzo[c]thiophene 2,2-dioxide is a source of o-quinodimethanes that are useful diene intermediates in Diels-Alder reactions; a source of benzocyclobutene.

1,3-Dihydrobenzo[c]thiophene 2,2-dioxide is prepared by oxidation of 1,3-dihydrobenzo[c]thiophene; from α,α′-Dibromo-o-xylene, rongalite (Sodium Hydroxymethanesulfinate, HOCH2SO2Na.2H2O), and Sulfur Dioxide.

unstable to alkali and concentrated H2SO4.