Figure 2.

(A). Oxidation of ebselen (1) with 1.0 equiv of hydrogen peroxide. (B) Oxidation of ebselen (1) with 1.0 equiv of hydrogen peroxide and 0.1 equiv (10 mol %) of 3. All reactions were conducted using 96 mg (0.35 mmol of ebselen in 10 mL of CDCl₃ containing dimethyl sulfone (Me₂SO₂) as an internal standard). Error bars in (A) are based on triplicate runs shown at ±1 standard deviation. A single run was made in (B). The indicated mol % of 3 in (B) was adjusted for the 10% added at the start.