CAS 7446-09-5 appears in our catalog under these names: Sulfur Dioxide (ca. 8% in Tetrahydrofuran, ca. 1.2 mol/L), Sulfur Dioxide (ca. 2.5% in Dichloromethane, ca. 0.5 mol/L), SULFUR DIOXIDE, SULFUR DIOXIDE SOLUTION, 0.5 M IN THF. Offered by: TCI, Sigma-Aldrich. Available pack sizes: 25ml, 100ml, 6KG.